planOptimizer.c 77.2 KB
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/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

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#include "filter.h"
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#include "functionMgt.h"
#include "planInt.h"
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#include "ttime.h"
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#define OPTIMIZE_FLAG_MASK(n) (1 << n)
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#define OPTIMIZE_FLAG_SCAN_PATH       OPTIMIZE_FLAG_MASK(0)
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#define OPTIMIZE_FLAG_PUSH_DOWN_CONDE OPTIMIZE_FLAG_MASK(1)
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#define OPTIMIZE_FLAG_SET_MASK(val, mask)  (val) |= (mask)
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#define OPTIMIZE_FLAG_TEST_MASK(val, mask) (((val) & (mask)) != 0)

typedef struct SOptimizeContext {
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  SPlanContext* pPlanCxt;
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  bool          optimized;
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} SOptimizeContext;

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typedef int32_t (*FOptimize)(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan);
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typedef struct SOptimizeRule {
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  char*     pName;
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  FOptimize optimizeFunc;
} SOptimizeRule;

typedef struct SOsdInfo {
  SScanLogicNode* pScan;
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  SNodeList*      pSdrFuncs;
  SNodeList*      pDsoFuncs;
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} SOsdInfo;

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typedef struct SCpdIsMultiTableCondCxt {
  SNodeList* pLeftCols;
  SNodeList* pRightCols;
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  bool       havaLeftCol;
  bool       haveRightCol;
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} SCpdIsMultiTableCondCxt;

typedef enum ECondAction {
  COND_ACTION_STAY = 1,
  COND_ACTION_PUSH_JOIN,
  COND_ACTION_PUSH_LEFT_CHILD,
  COND_ACTION_PUSH_RIGHT_CHILD
  // after supporting outer join, there are other possibilities
} ECondAction;

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typedef bool (*FMayBeOptimized)(SLogicNode* pNode);

static SLogicNode* optFindPossibleNode(SLogicNode* pNode, FMayBeOptimized func) {
  if (func(pNode)) {
    return pNode;
  }
  SNode* pChild;
  FOREACH(pChild, pNode->pChildren) {
    SLogicNode* pScanNode = optFindPossibleNode((SLogicNode*)pChild, func);
    if (NULL != pScanNode) {
      return pScanNode;
    }
  }
  return NULL;
}

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static void optResetParent(SLogicNode* pNode) {
  SNode* pChild = NULL;
  FOREACH(pChild, pNode->pChildren) { ((SLogicNode*)pChild)->pParent = pNode; }
}

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static EDealRes optRebuildTbanme(SNode** pNode, void* pContext) {
  if (QUERY_NODE_COLUMN == nodeType(*pNode) && COLUMN_TYPE_TBNAME == ((SColumnNode*)*pNode)->colType) {
    SFunctionNode* pFunc = (SFunctionNode*)nodesMakeNode(QUERY_NODE_FUNCTION);
    if (NULL == pFunc) {
      *(int32_t*)pContext = TSDB_CODE_OUT_OF_MEMORY;
      return DEAL_RES_ERROR;
    }
    strcpy(pFunc->functionName, "tbname");
    pFunc->funcType = FUNCTION_TYPE_TBNAME;
    pFunc->node.resType = ((SColumnNode*)*pNode)->node.resType;
    nodesDestroyNode(*pNode);
    *pNode = (SNode*)pFunc;
    return DEAL_RES_IGNORE_CHILD;
  }
  return DEAL_RES_CONTINUE;
}

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EDealRes scanPathOptHaveNormalColImpl(SNode* pNode, void* pContext) {
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  if (QUERY_NODE_COLUMN == nodeType(pNode)) {
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    // *((bool*)pContext) = (COLUMN_TYPE_TAG != ((SColumnNode*)pNode)->colType);
    *((bool*)pContext) = true;
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    return *((bool*)pContext) ? DEAL_RES_END : DEAL_RES_IGNORE_CHILD;
  }
  return DEAL_RES_CONTINUE;
}

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static bool scanPathOptHaveNormalCol(SNodeList* pList) {
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  bool res = false;
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  nodesWalkExprsPostOrder(pList, scanPathOptHaveNormalColImpl, &res);
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  return res;
}

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static bool scanPathOptMayBeOptimized(SLogicNode* pNode) {
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  if (OPTIMIZE_FLAG_TEST_MASK(pNode->optimizedFlag, OPTIMIZE_FLAG_SCAN_PATH)) {
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    return false;
  }
  if (QUERY_NODE_LOGIC_PLAN_SCAN != nodeType(pNode)) {
    return false;
  }
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  if (NULL == pNode->pParent || (QUERY_NODE_LOGIC_PLAN_WINDOW != nodeType(pNode->pParent) &&
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                                 QUERY_NODE_LOGIC_PLAN_AGG != nodeType(pNode->pParent) &&
                                 QUERY_NODE_LOGIC_PLAN_PARTITION != nodeType(pNode->pParent))) {
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    return false;
  }
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  if ((QUERY_NODE_LOGIC_PLAN_WINDOW == nodeType(pNode->pParent) &&
       WINDOW_TYPE_INTERVAL == ((SWindowLogicNode*)pNode->pParent)->winType) ||
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      (QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pNode->pParent) && pNode->pParent->pParent &&
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       QUERY_NODE_LOGIC_PLAN_WINDOW == nodeType(pNode->pParent->pParent) &&
       WINDOW_TYPE_INTERVAL == ((SWindowLogicNode*)pNode->pParent)->winType)) {
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    return true;
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  }
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  if (QUERY_NODE_LOGIC_PLAN_AGG == nodeType(pNode->pParent)) {
    return !scanPathOptHaveNormalCol(((SAggLogicNode*)pNode->pParent)->pGroupKeys);
  }
  return false;
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}

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static SNodeList* scanPathOptGetAllFuncs(SLogicNode* pNode) {
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  switch (nodeType(pNode)) {
    case QUERY_NODE_LOGIC_PLAN_WINDOW:
      return ((SWindowLogicNode*)pNode)->pFuncs;
    case QUERY_NODE_LOGIC_PLAN_AGG:
      return ((SAggLogicNode*)pNode)->pAggFuncs;
    default:
      break;
  }
  return NULL;
}

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static bool scanPathOptNeedOptimizeDataRequire(const SFunctionNode* pFunc) {
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  if (!fmIsSpecialDataRequiredFunc(pFunc->funcId)) {
    return false;
  }
  SNode* pPara = NULL;
  FOREACH(pPara, pFunc->pParameterList) {
    if (QUERY_NODE_COLUMN != nodeType(pPara) && QUERY_NODE_VALUE != nodeType(pPara)) {
      return false;
    }
  }
  return true;
}

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static bool scanPathOptNeedDynOptimize(const SFunctionNode* pFunc) {
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  if (!fmIsDynamicScanOptimizedFunc(pFunc->funcId)) {
    return false;
  }
  SNode* pPara = NULL;
  FOREACH(pPara, pFunc->pParameterList) {
    if (QUERY_NODE_COLUMN != nodeType(pPara) && QUERY_NODE_VALUE != nodeType(pPara)) {
      return false;
    }
  }
  return true;
}

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static int32_t scanPathOptGetRelatedFuncs(SScanLogicNode* pScan, SNodeList** pSdrFuncs, SNodeList** pDsoFuncs) {
  SNodeList* pAllFuncs = scanPathOptGetAllFuncs(pScan->node.pParent);
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  SNodeList* pTmpSdrFuncs = NULL;
  SNodeList* pTmpDsoFuncs = NULL;
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  SNode*     pFunc = NULL;
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  bool       otherFunc = false;
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  FOREACH(pFunc, pAllFuncs) {
    int32_t code = TSDB_CODE_SUCCESS;
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    if (scanPathOptNeedOptimizeDataRequire((SFunctionNode*)pFunc)) {
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      code = nodesListMakeStrictAppend(&pTmpSdrFuncs, nodesCloneNode(pFunc));
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    } else if (scanPathOptNeedDynOptimize((SFunctionNode*)pFunc)) {
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      code = nodesListMakeStrictAppend(&pTmpDsoFuncs, nodesCloneNode(pFunc));
    } else {
      otherFunc = true;
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    }
    if (TSDB_CODE_SUCCESS != code) {
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      nodesDestroyList(pTmpSdrFuncs);
      nodesDestroyList(pTmpDsoFuncs);
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      return code;
    }
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  }
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  if (otherFunc) {
    nodesDestroyList(pTmpSdrFuncs);
    nodesDestroyList(pTmpDsoFuncs);
  } else {
    *pSdrFuncs = pTmpSdrFuncs;
    *pDsoFuncs = pTmpDsoFuncs;
  }
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  return TSDB_CODE_SUCCESS;
}

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static int32_t scanPathOptMatch(SOptimizeContext* pCxt, SLogicNode* pLogicNode, SOsdInfo* pInfo) {
  pInfo->pScan = (SScanLogicNode*)optFindPossibleNode(pLogicNode, scanPathOptMayBeOptimized);
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  if (NULL == pInfo->pScan) {
    return TSDB_CODE_SUCCESS;
  }
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  return scanPathOptGetRelatedFuncs(pInfo->pScan, &pInfo->pSdrFuncs, &pInfo->pDsoFuncs);
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}

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static EFuncDataRequired scanPathOptPromoteDataRequired(EFuncDataRequired l, EFuncDataRequired r) {
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  switch (l) {
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    case FUNC_DATA_REQUIRED_DATA_LOAD:
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      return l;
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    case FUNC_DATA_REQUIRED_STATIS_LOAD:
      return FUNC_DATA_REQUIRED_DATA_LOAD == r ? r : l;
    case FUNC_DATA_REQUIRED_NOT_LOAD:
      return FUNC_DATA_REQUIRED_FILTEROUT == r ? l : r;
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    default:
      break;
  }
  return r;
}

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static int32_t scanPathOptGetDataRequired(SNodeList* pFuncs) {
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  if (NULL == pFuncs) {
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    return FUNC_DATA_REQUIRED_DATA_LOAD;
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  }
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  EFuncDataRequired dataRequired = FUNC_DATA_REQUIRED_FILTEROUT;
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  SNode*            pFunc = NULL;
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  FOREACH(pFunc, pFuncs) {
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    dataRequired = scanPathOptPromoteDataRequired(dataRequired, fmFuncDataRequired((SFunctionNode*)pFunc, NULL));
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  }
  return dataRequired;
}

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static void scanPathOptSetScanWin(SScanLogicNode* pScan) {
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  SLogicNode* pParent = pScan->node.pParent;
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  if (QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pParent) && pParent->pParent &&
      QUERY_NODE_LOGIC_PLAN_WINDOW == nodeType(pParent->pParent)) {
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    pParent = pParent->pParent;
  }
  if (QUERY_NODE_LOGIC_PLAN_WINDOW == nodeType(pParent)) {
    pScan->interval = ((SWindowLogicNode*)pParent)->interval;
    pScan->offset = ((SWindowLogicNode*)pParent)->offset;
    pScan->sliding = ((SWindowLogicNode*)pParent)->sliding;
    pScan->intervalUnit = ((SWindowLogicNode*)pParent)->intervalUnit;
    pScan->slidingUnit = ((SWindowLogicNode*)pParent)->slidingUnit;
    pScan->triggerType = ((SWindowLogicNode*)pParent)->triggerType;
    pScan->watermark = ((SWindowLogicNode*)pParent)->watermark;
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    pScan->igExpired = ((SWindowLogicNode*)pParent)->igExpired;
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  }
}

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static int32_t scanPathOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
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  SOsdInfo info = {0};
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  int32_t  code = scanPathOptMatch(pCxt, pLogicSubplan->pNode, &info);
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  if (TSDB_CODE_SUCCESS == code && info.pScan) {
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    scanPathOptSetScanWin((SScanLogicNode*)info.pScan);
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  }
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  if (TSDB_CODE_SUCCESS == code && (NULL != info.pDsoFuncs || NULL != info.pSdrFuncs)) {
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    info.pScan->dataRequired = scanPathOptGetDataRequired(info.pSdrFuncs);
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    info.pScan->pDynamicScanFuncs = info.pDsoFuncs;
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    OPTIMIZE_FLAG_SET_MASK(info.pScan->node.optimizedFlag, OPTIMIZE_FLAG_SCAN_PATH);
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    pCxt->optimized = true;
  }
  nodesDestroyList(info.pSdrFuncs);
  return code;
}

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static int32_t pushDownCondOptMergeCond(SNode** pDst, SNode** pSrc) {
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  SLogicConditionNode* pLogicCond = (SLogicConditionNode*)nodesMakeNode(QUERY_NODE_LOGIC_CONDITION);
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  if (NULL == pLogicCond) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
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  pLogicCond->node.resType.type = TSDB_DATA_TYPE_BOOL;
  pLogicCond->node.resType.bytes = tDataTypes[TSDB_DATA_TYPE_BOOL].bytes;
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  pLogicCond->condType = LOGIC_COND_TYPE_AND;
  int32_t code = nodesListMakeAppend(&pLogicCond->pParameterList, *pSrc);
  if (TSDB_CODE_SUCCESS == code) {
    *pSrc = NULL;
    code = nodesListMakeAppend(&pLogicCond->pParameterList, *pDst);
  }
  if (TSDB_CODE_SUCCESS == code) {
    *pDst = (SNode*)pLogicCond;
  } else {
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    nodesDestroyNode((SNode*)pLogicCond);
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  }
  return code;
}

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static int32_t pushDownCondOptAppendCond(SNode** pCond, SNode** pAdditionalCond) {
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  if (NULL == *pCond) {
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    TSWAP(*pCond, *pAdditionalCond);
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    return TSDB_CODE_SUCCESS;
  }

  int32_t code = TSDB_CODE_SUCCESS;
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  if (QUERY_NODE_LOGIC_CONDITION == nodeType(*pCond) &&
      LOGIC_COND_TYPE_AND == ((SLogicConditionNode*)*pCond)->condType) {
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    code = nodesListAppend(((SLogicConditionNode*)*pCond)->pParameterList, *pAdditionalCond);
    if (TSDB_CODE_SUCCESS == code) {
      *pAdditionalCond = NULL;
    }
  } else {
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    code = pushDownCondOptMergeCond(pCond, pAdditionalCond);
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  }
  return code;
}

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static int32_t pushDownCondOptCalcTimeRange(SOptimizeContext* pCxt, SScanLogicNode* pScan, SNode** pPrimaryKeyCond,
                                            SNode** pOtherCond) {
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  int32_t code = TSDB_CODE_SUCCESS;
  if (pCxt->pPlanCxt->topicQuery || pCxt->pPlanCxt->streamQuery) {
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    code = pushDownCondOptAppendCond(pOtherCond, pPrimaryKeyCond);
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  } else {
    bool isStrict = false;
    code = filterGetTimeRange(*pPrimaryKeyCond, &pScan->scanRange, &isStrict);
    if (TSDB_CODE_SUCCESS == code) {
      if (isStrict) {
        nodesDestroyNode(*pPrimaryKeyCond);
      } else {
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        code = pushDownCondOptAppendCond(pOtherCond, pPrimaryKeyCond);
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      }
      *pPrimaryKeyCond = NULL;
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    }
  }
  return code;
}

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static int32_t pushDownCondOptRebuildTbanme(SNode** pTagCond) {
  int32_t code = TSDB_CODE_SUCCESS;
  nodesRewriteExpr(pTagCond, optRebuildTbanme, &code);
  return code;
}

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static int32_t pushDownCondOptDealScan(SOptimizeContext* pCxt, SScanLogicNode* pScan) {
  if (NULL == pScan->node.pConditions ||
      OPTIMIZE_FLAG_TEST_MASK(pScan->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE) ||
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      TSDB_SYSTEM_TABLE == pScan->tableType) {
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    return TSDB_CODE_SUCCESS;
  }

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  SNode*  pPrimaryKeyCond = NULL;
  SNode*  pOtherCond = NULL;
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  int32_t code = nodesPartitionCond(&pScan->node.pConditions, &pPrimaryKeyCond, &pScan->pTagIndexCond, &pScan->pTagCond,
                                    &pOtherCond);
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  if (TSDB_CODE_SUCCESS == code && NULL != pScan->pTagCond) {
    code = pushDownCondOptRebuildTbanme(&pScan->pTagCond);
  }
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  if (TSDB_CODE_SUCCESS == code && NULL != pPrimaryKeyCond) {
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    code = pushDownCondOptCalcTimeRange(pCxt, pScan, &pPrimaryKeyCond, &pOtherCond);
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  }
  if (TSDB_CODE_SUCCESS == code) {
    pScan->node.pConditions = pOtherCond;
  }

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  if (TSDB_CODE_SUCCESS == code) {
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    OPTIMIZE_FLAG_SET_MASK(pScan->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
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    pCxt->optimized = true;
  } else {
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    nodesDestroyNode(pPrimaryKeyCond);
    nodesDestroyNode(pOtherCond);
  }

  return code;
}

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static bool pushDownCondOptBelongThisTable(SNode* pCondCol, SNodeList* pTableCols) {
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  SNode* pTableCol = NULL;
  FOREACH(pTableCol, pTableCols) {
    if (nodesEqualNode(pCondCol, pTableCol)) {
      return true;
    }
  }
  return false;
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}

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static EDealRes pushDownCondOptIsCrossTableCond(SNode* pNode, void* pContext) {
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  SCpdIsMultiTableCondCxt* pCxt = pContext;
  if (QUERY_NODE_COLUMN == nodeType(pNode)) {
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    if (pushDownCondOptBelongThisTable(pNode, pCxt->pLeftCols)) {
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      pCxt->havaLeftCol = true;
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    } else if (pushDownCondOptBelongThisTable(pNode, pCxt->pRightCols)) {
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      pCxt->haveRightCol = true;
    }
    return pCxt->havaLeftCol && pCxt->haveRightCol ? DEAL_RES_END : DEAL_RES_CONTINUE;
  }
  return DEAL_RES_CONTINUE;
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}

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static ECondAction pushDownCondOptGetCondAction(EJoinType joinType, SNodeList* pLeftCols, SNodeList* pRightCols,
                                                SNode* pNode) {
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  SCpdIsMultiTableCondCxt cxt = {
      .pLeftCols = pLeftCols, .pRightCols = pRightCols, .havaLeftCol = false, .haveRightCol = false};
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  nodesWalkExpr(pNode, pushDownCondOptIsCrossTableCond, &cxt);
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  return (JOIN_TYPE_INNER != joinType
              ? COND_ACTION_STAY
              : (cxt.havaLeftCol && cxt.haveRightCol
                     ? COND_ACTION_PUSH_JOIN
                     : (cxt.havaLeftCol ? COND_ACTION_PUSH_LEFT_CHILD : COND_ACTION_PUSH_RIGHT_CHILD)));
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}

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static int32_t pushDownCondOptPartLogicCond(SJoinLogicNode* pJoin, SNode** pOnCond, SNode** pLeftChildCond,
                                            SNode** pRightChildCond) {
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  SLogicConditionNode* pLogicCond = (SLogicConditionNode*)pJoin->node.pConditions;
  if (LOGIC_COND_TYPE_AND != pLogicCond->condType) {
    return TSDB_CODE_SUCCESS;
  }

  SNodeList* pLeftCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 0))->pTargets;
  SNodeList* pRightCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 1))->pTargets;
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  int32_t    code = TSDB_CODE_SUCCESS;
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  SNodeList* pOnConds = NULL;
  SNodeList* pLeftChildConds = NULL;
  SNodeList* pRightChildConds = NULL;
  SNodeList* pRemainConds = NULL;
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  SNode*     pCond = NULL;
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  FOREACH(pCond, pLogicCond->pParameterList) {
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    ECondAction condAction = pushDownCondOptGetCondAction(pJoin->joinType, pLeftCols, pRightCols, pCond);
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    if (COND_ACTION_PUSH_JOIN == condAction) {
      code = nodesListMakeAppend(&pOnConds, nodesCloneNode(pCond));
    } else if (COND_ACTION_PUSH_LEFT_CHILD == condAction) {
      code = nodesListMakeAppend(&pLeftChildConds, nodesCloneNode(pCond));
    } else if (COND_ACTION_PUSH_RIGHT_CHILD == condAction) {
      code = nodesListMakeAppend(&pRightChildConds, nodesCloneNode(pCond));
    } else {
      code = nodesListMakeAppend(&pRemainConds, nodesCloneNode(pCond));
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    }
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    if (TSDB_CODE_SUCCESS != code) {
      break;
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    }
  }
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  SNode* pTempOnCond = NULL;
  SNode* pTempLeftChildCond = NULL;
  SNode* pTempRightChildCond = NULL;
  SNode* pTempRemainCond = NULL;
  if (TSDB_CODE_SUCCESS == code) {
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    code = nodesMergeConds(&pTempOnCond, &pOnConds);
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  }
  if (TSDB_CODE_SUCCESS == code) {
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    code = nodesMergeConds(&pTempLeftChildCond, &pLeftChildConds);
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  }
  if (TSDB_CODE_SUCCESS == code) {
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    code = nodesMergeConds(&pTempRightChildCond, &pRightChildConds);
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  }
  if (TSDB_CODE_SUCCESS == code) {
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    code = nodesMergeConds(&pTempRemainCond, &pRemainConds);
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  }

  if (TSDB_CODE_SUCCESS == code) {
    *pOnCond = pTempOnCond;
    *pLeftChildCond = pTempLeftChildCond;
    *pRightChildCond = pTempRightChildCond;
    nodesDestroyNode(pJoin->node.pConditions);
    pJoin->node.pConditions = pTempRemainCond;
  } else {
    nodesDestroyList(pOnConds);
    nodesDestroyList(pLeftChildConds);
    nodesDestroyList(pRightChildConds);
    nodesDestroyList(pRemainConds);
    nodesDestroyNode(pTempOnCond);
    nodesDestroyNode(pTempLeftChildCond);
    nodesDestroyNode(pTempRightChildCond);
    nodesDestroyNode(pTempRemainCond);
  }

  return code;
}

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static int32_t pushDownCondOptPartOpCond(SJoinLogicNode* pJoin, SNode** pOnCond, SNode** pLeftChildCond,
                                         SNode** pRightChildCond) {
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  SNodeList*  pLeftCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 0))->pTargets;
  SNodeList*  pRightCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 1))->pTargets;
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  ECondAction condAction =
      pushDownCondOptGetCondAction(pJoin->joinType, pLeftCols, pRightCols, pJoin->node.pConditions);
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  if (COND_ACTION_STAY == condAction) {
    return TSDB_CODE_SUCCESS;
  } else if (COND_ACTION_PUSH_JOIN == condAction) {
    *pOnCond = pJoin->node.pConditions;
  } else if (COND_ACTION_PUSH_LEFT_CHILD == condAction) {
    *pLeftChildCond = pJoin->node.pConditions;
  } else if (COND_ACTION_PUSH_RIGHT_CHILD == condAction) {
    *pRightChildCond = pJoin->node.pConditions;
  }
  pJoin->node.pConditions = NULL;
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  return TSDB_CODE_SUCCESS;
}

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static int32_t pushDownCondOptPartCond(SJoinLogicNode* pJoin, SNode** pOnCond, SNode** pLeftChildCond,
                                       SNode** pRightChildCond) {
500
  if (QUERY_NODE_LOGIC_CONDITION == nodeType(pJoin->node.pConditions)) {
501
    return pushDownCondOptPartLogicCond(pJoin, pOnCond, pLeftChildCond, pRightChildCond);
502
  } else {
503
    return pushDownCondOptPartOpCond(pJoin, pOnCond, pLeftChildCond, pRightChildCond);
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  }
}

507 508
static int32_t pushDownCondOptPushCondToOnCond(SOptimizeContext* pCxt, SJoinLogicNode* pJoin, SNode** pCond) {
  return pushDownCondOptAppendCond(&pJoin->pOnConditions, pCond);
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}

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static int32_t pushDownCondOptPushCondToScan(SOptimizeContext* pCxt, SScanLogicNode* pScan, SNode** pCond) {
  return pushDownCondOptAppendCond(&pScan->node.pConditions, pCond);
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}

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static int32_t pushDownCondOptPushCondToProject(SOptimizeContext* pCxt, SProjectLogicNode* pProject, SNode** pCond) {
  return pushDownCondOptAppendCond(&pProject->node.pConditions, pCond);
}

519
static int32_t pushDownCondOptPushCondToJoin(SOptimizeContext* pCxt, SJoinLogicNode* pJoin, SNode** pCond) {
520 521 522
  return pushDownCondOptAppendCond(&pJoin->node.pConditions, pCond);
}

523
static int32_t pushDownCondOptPushCondToChild(SOptimizeContext* pCxt, SLogicNode* pChild, SNode** pCond) {
524
  return pushDownCondOptAppendCond(&pChild->pConditions, pCond);
525 526
}

527
static bool pushDownCondOptIsPriKey(SNode* pNode, SNodeList* pTableCols) {
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  if (QUERY_NODE_COLUMN != nodeType(pNode)) {
    return false;
  }
  SColumnNode* pCol = (SColumnNode*)pNode;
  if (PRIMARYKEY_TIMESTAMP_COL_ID != pCol->colId) {
    return false;
  }
535
  return pushDownCondOptBelongThisTable(pNode, pTableCols);
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}

538
static bool pushDownCondOptIsPriKeyEqualCond(SJoinLogicNode* pJoin, SNode* pCond) {
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  if (QUERY_NODE_OPERATOR != nodeType(pCond)) {
    return false;
  }
542

543
  SOperatorNode* pOper = (SOperatorNode*)pCond;
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  if (OP_TYPE_EQUAL != pOper->opType) {
    return false;
  }

  SNodeList* pLeftCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 0))->pTargets;
  SNodeList* pRightCols = ((SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 1))->pTargets;
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  if (pushDownCondOptIsPriKey(pOper->pLeft, pLeftCols)) {
    return pushDownCondOptIsPriKey(pOper->pRight, pRightCols);
  } else if (pushDownCondOptIsPriKey(pOper->pLeft, pRightCols)) {
    return pushDownCondOptIsPriKey(pOper->pRight, pLeftCols);
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  }
  return false;
}

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static bool pushDownCondOptContainPriKeyEqualCond(SJoinLogicNode* pJoin, SNode* pCond) {
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  if (QUERY_NODE_LOGIC_CONDITION == nodeType(pCond)) {
    SLogicConditionNode* pLogicCond = (SLogicConditionNode*)pCond;
    if (LOGIC_COND_TYPE_AND != pLogicCond->condType) {
      return false;
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    }
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    bool   hasPrimaryKeyEqualCond = false;
    SNode* pCond = NULL;
    FOREACH(pCond, pLogicCond->pParameterList) {
567
      if (pushDownCondOptContainPriKeyEqualCond(pJoin, pCond)) {
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        hasPrimaryKeyEqualCond = true;
        break;
      }
    }
    return hasPrimaryKeyEqualCond;
  } else {
574
    return pushDownCondOptIsPriKeyEqualCond(pJoin, pCond);
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  }
}

578
static int32_t pushDownCondOptCheckJoinOnCond(SOptimizeContext* pCxt, SJoinLogicNode* pJoin) {
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  if (NULL == pJoin->pOnConditions) {
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    return generateUsageErrMsg(pCxt->pPlanCxt->pMsg, pCxt->pPlanCxt->msgLen, TSDB_CODE_PLAN_NOT_SUPPORT_CROSS_JOIN);
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  }
582
  if (!pushDownCondOptContainPriKeyEqualCond(pJoin, pJoin->pOnConditions)) {
583
    return generateUsageErrMsg(pCxt->pPlanCxt->pMsg, pCxt->pPlanCxt->msgLen, TSDB_CODE_PLAN_EXPECTED_TS_EQUAL);
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  }
585
  return TSDB_CODE_SUCCESS;
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}

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static int32_t pushDownCondOptPartJoinOnCondLogicCond(SJoinLogicNode* pJoin, SNode** ppMergeCond, SNode** ppOnCond) {
  SLogicConditionNode* pLogicCond = (SLogicConditionNode*)(pJoin->pOnConditions);

591
  int32_t    code = TSDB_CODE_SUCCESS;
592
  SNodeList* pOnConds = NULL;
593
  SNode*     pCond = NULL;
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  FOREACH(pCond, pLogicCond->pParameterList) {
    if (pushDownCondOptIsPriKeyEqualCond(pJoin, pCond)) {
      *ppMergeCond = nodesCloneNode(pCond);
    } else {
      code = nodesListMakeAppend(&pOnConds, nodesCloneNode(pCond));
    }
  }

  SNode* pTempOnCond = NULL;
  if (TSDB_CODE_SUCCESS == code) {
    code = nodesMergeConds(&pTempOnCond, &pOnConds);
  }

  if (TSDB_CODE_SUCCESS == code && NULL != *ppMergeCond) {
    *ppOnCond = pTempOnCond;
    nodesDestroyNode(pJoin->pOnConditions);
    pJoin->pOnConditions = NULL;
    return TSDB_CODE_SUCCESS;
  } else {
    nodesDestroyList(pOnConds);
    nodesDestroyNode(pTempOnCond);
    return TSDB_CODE_PLAN_INTERNAL_ERROR;
  }
}

static int32_t pushDownCondOptPartJoinOnCond(SJoinLogicNode* pJoin, SNode** ppMergeCond, SNode** ppOnCond) {
  if (QUERY_NODE_LOGIC_CONDITION == nodeType(pJoin->pOnConditions) &&
      LOGIC_COND_TYPE_AND == ((SLogicConditionNode*)(pJoin->pOnConditions))->condType) {
    return pushDownCondOptPartJoinOnCondLogicCond(pJoin, ppMergeCond, ppOnCond);
  }

  if (pushDownCondOptIsPriKeyEqualCond(pJoin, pJoin->pOnConditions)) {
    *ppMergeCond = nodesCloneNode(pJoin->pOnConditions);
    *ppOnCond = NULL;
    nodesDestroyNode(pJoin->pOnConditions);
    pJoin->pOnConditions = NULL;
    return TSDB_CODE_SUCCESS;
  } else {
    return TSDB_CODE_PLAN_INTERNAL_ERROR;
  }
}

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static int32_t pushDownCondOptJoinExtractMergeCond(SOptimizeContext* pCxt, SJoinLogicNode* pJoin) {
  int32_t code = pushDownCondOptCheckJoinOnCond(pCxt, pJoin);
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  SNode*  pJoinMergeCond = NULL;
  SNode*  pJoinOnCond = NULL;
640 641 642 643 644 645 646 647 648 649 650 651 652
  if (TSDB_CODE_SUCCESS == code) {
    code = pushDownCondOptPartJoinOnCond(pJoin, &pJoinMergeCond, &pJoinOnCond);
  }
  if (TSDB_CODE_SUCCESS == code) {
    pJoin->pMergeCondition = pJoinMergeCond;
    pJoin->pOnConditions = pJoinOnCond;
  } else {
    nodesDestroyNode(pJoinMergeCond);
    nodesDestroyNode(pJoinOnCond);
  }
  return code;
}

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static int32_t pushDownCondOptDealJoin(SOptimizeContext* pCxt, SJoinLogicNode* pJoin) {
  if (OPTIMIZE_FLAG_TEST_MASK(pJoin->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE)) {
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    return TSDB_CODE_SUCCESS;
  }

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  if (NULL == pJoin->node.pConditions) {
659
    int32_t code = pushDownCondOptJoinExtractMergeCond(pCxt, pJoin);
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    if (TSDB_CODE_SUCCESS == code) {
      OPTIMIZE_FLAG_SET_MASK(pJoin->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
      pCxt->optimized = true;
    }
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    return code;
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  }

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  SNode*  pOnCond = NULL;
  SNode*  pLeftChildCond = NULL;
  SNode*  pRightChildCond = NULL;
670
  int32_t code = pushDownCondOptPartCond(pJoin, &pOnCond, &pLeftChildCond, &pRightChildCond);
671
  if (TSDB_CODE_SUCCESS == code && NULL != pOnCond) {
672
    code = pushDownCondOptPushCondToOnCond(pCxt, pJoin, &pOnCond);
673 674
  }
  if (TSDB_CODE_SUCCESS == code && NULL != pLeftChildCond) {
675 676
    code =
        pushDownCondOptPushCondToChild(pCxt, (SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 0), &pLeftChildCond);
677 678
  }
  if (TSDB_CODE_SUCCESS == code && NULL != pRightChildCond) {
679 680
    code =
        pushDownCondOptPushCondToChild(pCxt, (SLogicNode*)nodesListGetNode(pJoin->node.pChildren, 1), &pRightChildCond);
681 682
  }

683
  if (TSDB_CODE_SUCCESS == code) {
684
    code = pushDownCondOptJoinExtractMergeCond(pCxt, pJoin);
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  }

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  if (TSDB_CODE_SUCCESS == code) {
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    OPTIMIZE_FLAG_SET_MASK(pJoin->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
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    pCxt->optimized = true;
  } else {
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    nodesDestroyNode(pOnCond);
    nodesDestroyNode(pLeftChildCond);
    nodesDestroyNode(pRightChildCond);
  }

  return code;
}

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typedef struct SPartAggCondContext {
  SAggLogicNode* pAgg;
701
  bool           hasAggFunc;
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} SPartAggCondContext;

static EDealRes partAggCondHasAggFuncImpl(SNode* pNode, void* pContext) {
  SPartAggCondContext* pCxt = pContext;
  if (QUERY_NODE_COLUMN == nodeType(pNode)) {
    SNode* pAggFunc = NULL;
    FOREACH(pAggFunc, pCxt->pAgg->pAggFuncs) {
      if (strcmp(((SColumnNode*)pNode)->colName, ((SFunctionNode*)pAggFunc)->node.aliasName) == 0) {
        pCxt->hasAggFunc = true;
        return DEAL_RES_END;
      }
    }
  }
  return DEAL_RES_CONTINUE;
}

static int32_t partitionAggCondHasAggFunc(SAggLogicNode* pAgg, SNode* pCond) {
  SPartAggCondContext cxt = {.pAgg = pAgg, .hasAggFunc = false};
  nodesWalkExpr(pCond, partAggCondHasAggFuncImpl, &cxt);
  return cxt.hasAggFunc;
}

static int32_t partitionAggCondConj(SAggLogicNode* pAgg, SNode** ppAggFuncCond, SNode** ppGroupKeyCond) {
  SLogicConditionNode* pLogicCond = (SLogicConditionNode*)pAgg->node.pConditions;
726
  int32_t              code = TSDB_CODE_SUCCESS;
727 728 729

  SNodeList* pAggFuncConds = NULL;
  SNodeList* pGroupKeyConds = NULL;
730
  SNode*     pCond = NULL;
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  FOREACH(pCond, pLogicCond->pParameterList) {
    if (partitionAggCondHasAggFunc(pAgg, pCond)) {
      code = nodesListMakeAppend(&pAggFuncConds, nodesCloneNode(pCond));
    } else {
      code = nodesListMakeAppend(&pGroupKeyConds, nodesCloneNode(pCond));
    }
    if (TSDB_CODE_SUCCESS != code) {
      break;
    }
  }

  SNode* pTempAggFuncCond = NULL;
  SNode* pTempGroupKeyCond = NULL;
  if (TSDB_CODE_SUCCESS == code) {
    code = nodesMergeConds(&pTempAggFuncCond, &pAggFuncConds);
  }
  if (TSDB_CODE_SUCCESS == code) {
    code = nodesMergeConds(&pTempGroupKeyCond, &pGroupKeyConds);
  }

  if (TSDB_CODE_SUCCESS == code) {
    *ppAggFuncCond = pTempAggFuncCond;
    *ppGroupKeyCond = pTempGroupKeyCond;
  } else {
    nodesDestroyList(pAggFuncConds);
    nodesDestroyList(pGroupKeyConds);
    nodesDestroyNode(pTempAggFuncCond);
    nodesDestroyNode(pTempGroupKeyCond);
  }
  pAgg->node.pConditions = NULL;
  return code;
}

static int32_t partitionAggCond(SAggLogicNode* pAgg, SNode** ppAggFunCond, SNode** ppGroupKeyCond) {
  SNode* pAggNodeCond = pAgg->node.pConditions;
  if (QUERY_NODE_LOGIC_CONDITION == nodeType(pAggNodeCond) &&
      LOGIC_COND_TYPE_AND == ((SLogicConditionNode*)(pAggNodeCond))->condType) {
    return partitionAggCondConj(pAgg, ppAggFunCond, ppGroupKeyCond);
  }
  if (partitionAggCondHasAggFunc(pAgg, pAggNodeCond)) {
    *ppAggFunCond = pAggNodeCond;
  } else {
    *ppGroupKeyCond = pAggNodeCond;
  }
  pAgg->node.pConditions = NULL;
776 777 778
  return TSDB_CODE_SUCCESS;
}

779 780 781 782 783
static int32_t pushCondToAggCond(SOptimizeContext* pCxt, SAggLogicNode* pAgg, SNode** pAggFuncCond) {
  pushDownCondOptAppendCond(&pAgg->node.pConditions, pAggFuncCond);
  return TSDB_CODE_SUCCESS;
}

784 785 786
typedef struct SRewriteAggGroupKeyCondContext {
  SAggLogicNode* pAgg;
  int32_t        errCode;
787 788 789 790
} SRewriteAggGroupKeyCondContext;

static EDealRes rewriteAggGroupKeyCondForPushDownImpl(SNode** pNode, void* pContext) {
  SRewriteAggGroupKeyCondContext* pCxt = pContext;
791
  SAggLogicNode*                  pAgg = pCxt->pAgg;
792 793 794 795 796 797 798 799
  if (QUERY_NODE_COLUMN == nodeType(*pNode)) {
    SNode* pGroupKey = NULL;
    FOREACH(pGroupKey, pAgg->pGroupKeys) {
      SNode* pGroup = NULL;
      FOREACH(pGroup, ((SGroupingSetNode*)pGroupKey)->pParameterList) {
        if (0 == strcmp(((SExprNode*)pGroup)->aliasName, ((SColumnNode*)(*pNode))->colName)) {
          SNode* pExpr = nodesCloneNode(pGroup);
          if (pExpr == NULL) {
800
            pCxt->errCode = TSDB_CODE_OUT_OF_MEMORY;
801 802 803 804
            return DEAL_RES_ERROR;
          }
          nodesDestroyNode(*pNode);
          *pNode = pExpr;
805
          return DEAL_RES_IGNORE_CHILD;
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
        }
      }
    }
  }
  return DEAL_RES_CONTINUE;
}

static int32_t rewriteAggGroupKeyCondForPushDown(SOptimizeContext* pCxt, SAggLogicNode* pAgg, SNode* pGroupKeyCond) {
  SRewriteAggGroupKeyCondContext cxt = {.pAgg = pAgg, .errCode = TSDB_CODE_SUCCESS};
  nodesRewriteExpr(&pGroupKeyCond, rewriteAggGroupKeyCondForPushDownImpl, &cxt);
  return cxt.errCode;
}

static int32_t pushDownCondOptDealAgg(SOptimizeContext* pCxt, SAggLogicNode* pAgg) {
  if (NULL == pAgg->node.pConditions ||
      OPTIMIZE_FLAG_TEST_MASK(pAgg->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE)) {
    return TSDB_CODE_SUCCESS;
  }
824
  // TODO: remove it after full implementation of pushing down to child
825
  if (1 != LIST_LENGTH(pAgg->node.pChildren)) {
826 827
    return TSDB_CODE_SUCCESS;
  }
828 829 830

  SNode*  pAggFuncCond = NULL;
  SNode*  pGroupKeyCond = NULL;
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
  int32_t code = partitionAggCond(pAgg, &pAggFuncCond, &pGroupKeyCond);
  if (TSDB_CODE_SUCCESS == code && NULL != pAggFuncCond) {
    code = pushCondToAggCond(pCxt, pAgg, &pAggFuncCond);
  }
  if (TSDB_CODE_SUCCESS == code && NULL != pGroupKeyCond) {
    code = rewriteAggGroupKeyCondForPushDown(pCxt, pAgg, pGroupKeyCond);
  }
  if (TSDB_CODE_SUCCESS == code && NULL != pGroupKeyCond) {
    SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pAgg->node.pChildren, 0);
    code = pushDownCondOptPushCondToChild(pCxt, pChild, &pGroupKeyCond);
  }
  if (TSDB_CODE_SUCCESS == code) {
    OPTIMIZE_FLAG_SET_MASK(pAgg->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
    pCxt->optimized = true;
  } else {
    nodesDestroyNode(pGroupKeyCond);
    nodesDestroyNode(pAggFuncCond);
  }
  return code;
}

852 853
typedef struct SRewriteProjCondContext {
  SProjectLogicNode* pProj;
854 855
  int32_t            errCode;
} SRewriteProjCondContext;
856 857 858

static EDealRes rewriteProjectCondForPushDownImpl(SNode** ppNode, void* pContext) {
  SRewriteProjCondContext* pCxt = pContext;
859
  SProjectLogicNode*       pProj = pCxt->pProj;
860 861 862 863 864 865 866 867 868
  if (QUERY_NODE_COLUMN == nodeType(*ppNode)) {
    SNode* pTarget = NULL;
    FOREACH(pTarget, pProj->node.pTargets) {
      if (nodesEqualNode(pTarget, *ppNode)) {
        SNode* pProjection = NULL;
        FOREACH(pProjection, pProj->pProjections) {
          if (0 == strcmp(((SExprNode*)pProjection)->aliasName, ((SColumnNode*)(*ppNode))->colName)) {
            SNode* pExpr = nodesCloneNode(pProjection);
            if (pExpr == NULL) {
869
              pCxt->errCode = TSDB_CODE_OUT_OF_MEMORY;
870 871 872 873
              return DEAL_RES_ERROR;
            }
            nodesDestroyNode(*ppNode);
            *ppNode = pExpr;
874
            return DEAL_RES_IGNORE_CHILD;
875 876 877 878
          }  // end if expr alias name equal column name
        }    // end for each project
      }      // end if target node equals cond column node
    }        // end for each targets
879 880 881 882
  }
  return DEAL_RES_CONTINUE;
}

883 884
static int32_t rewriteProjectCondForPushDown(SOptimizeContext* pCxt, SProjectLogicNode* pProject,
                                             SNode** ppProjectCond) {
885
  SRewriteProjCondContext cxt = {.pProj = pProject, .errCode = TSDB_CODE_SUCCESS};
886
  SNode*                  pProjectCond = pProject->node.pConditions;
887 888 889 890 891 892 893 894 895 896 897 898
  nodesRewriteExpr(&pProjectCond, rewriteProjectCondForPushDownImpl, &cxt);
  *ppProjectCond = pProjectCond;
  pProject->node.pConditions = NULL;
  return cxt.errCode;
}

static int32_t pushDownCondOptDealProject(SOptimizeContext* pCxt, SProjectLogicNode* pProject) {
  if (NULL == pProject->node.pConditions ||
      OPTIMIZE_FLAG_TEST_MASK(pProject->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE)) {
    return TSDB_CODE_SUCCESS;
  }
  // TODO: remove it after full implementation of pushing down to child
899
  if (1 != LIST_LENGTH(pProject->node.pChildren)) {
900 901 902 903 904 905 906 907
    return TSDB_CODE_SUCCESS;
  }

  if (NULL != pProject->node.pLimit || NULL != pProject->node.pSlimit) {
    return TSDB_CODE_SUCCESS;
  }

  int32_t code = TSDB_CODE_SUCCESS;
908
  SNode*  pProjCond = NULL;
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
  code = rewriteProjectCondForPushDown(pCxt, pProject, &pProjCond);
  if (TSDB_CODE_SUCCESS == code) {
    SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pProject->node.pChildren, 0);
    code = pushDownCondOptPushCondToChild(pCxt, pChild, &pProjCond);
  }

  if (TSDB_CODE_SUCCESS == code) {
    OPTIMIZE_FLAG_SET_MASK(pProject->node.optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
    pCxt->optimized = true;
  } else {
    nodesDestroyNode(pProjCond);
  }
  return code;
}

924
static int32_t pushDownCondOptTrivialPushDown(SOptimizeContext* pCxt, SLogicNode* pLogicNode) {
925 926 927 928 929
  if (NULL == pLogicNode->pConditions ||
      OPTIMIZE_FLAG_TEST_MASK(pLogicNode->optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE)) {
    return TSDB_CODE_SUCCESS;
  }
  SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pLogicNode->pChildren, 0);
930
  int32_t     code = pushDownCondOptPushCondToChild(pCxt, pChild, &pLogicNode->pConditions);
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  if (TSDB_CODE_SUCCESS == code) {
    OPTIMIZE_FLAG_SET_MASK(pLogicNode->optimizedFlag, OPTIMIZE_FLAG_PUSH_DOWN_CONDE);
    pCxt->optimized = true;
  }
  return code;
}

938
static int32_t pushDownCondOptimizeImpl(SOptimizeContext* pCxt, SLogicNode* pLogicNode) {
939 940 941
  int32_t code = TSDB_CODE_SUCCESS;
  switch (nodeType(pLogicNode)) {
    case QUERY_NODE_LOGIC_PLAN_SCAN:
942
      code = pushDownCondOptDealScan(pCxt, (SScanLogicNode*)pLogicNode);
943 944
      break;
    case QUERY_NODE_LOGIC_PLAN_JOIN:
945
      code = pushDownCondOptDealJoin(pCxt, (SJoinLogicNode*)pLogicNode);
946 947
      break;
    case QUERY_NODE_LOGIC_PLAN_AGG:
948
      code = pushDownCondOptDealAgg(pCxt, (SAggLogicNode*)pLogicNode);
949
      break;
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    case QUERY_NODE_LOGIC_PLAN_PROJECT:
      code = pushDownCondOptDealProject(pCxt, (SProjectLogicNode*)pLogicNode);
      break;
953 954
    case QUERY_NODE_LOGIC_PLAN_SORT:
    case QUERY_NODE_LOGIC_PLAN_PARTITION:
955
      code = pushDownCondOptTrivialPushDown(pCxt, pLogicNode);
956
      break;
957 958 959 960 961 962
    default:
      break;
  }
  if (TSDB_CODE_SUCCESS == code) {
    SNode* pChild = NULL;
    FOREACH(pChild, pLogicNode->pChildren) {
963
      code = pushDownCondOptimizeImpl(pCxt, (SLogicNode*)pChild);
964 965 966 967 968 969 970 971
      if (TSDB_CODE_SUCCESS != code) {
        break;
      }
    }
  }
  return code;
}

972 973
static int32_t pushDownCondOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  return pushDownCondOptimizeImpl(pCxt, pLogicSubplan->pNode);
974 975
}

976
static bool sortPriKeyOptIsPriKeyOrderBy(SNodeList* pSortKeys) {
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  if (1 != LIST_LENGTH(pSortKeys)) {
    return false;
  }
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  SNode* pNode = ((SOrderByExprNode*)nodesListGetNode(pSortKeys, 0))->pExpr;
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  return (QUERY_NODE_COLUMN == nodeType(pNode) ? (PRIMARYKEY_TIMESTAMP_COL_ID == ((SColumnNode*)pNode)->colId) : false);
}

984
static bool sortPriKeyOptMayBeOptimized(SLogicNode* pNode) {
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  if (QUERY_NODE_LOGIC_PLAN_SORT != nodeType(pNode)) {
    return false;
  }
988 989 990
  SSortLogicNode* pSort = (SSortLogicNode*)pNode;
  if (pSort->groupSort || !sortPriKeyOptIsPriKeyOrderBy(pSort->pSortKeys) || 1 != LIST_LENGTH(pSort->node.pChildren)) {
    return TSDB_CODE_SUCCESS;
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  }
  return true;
}

995
static int32_t sortPriKeyOptGetScanNodesImpl(SLogicNode* pNode, bool* pNotOptimize, SNodeList** pScanNodes) {
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  int32_t code = TSDB_CODE_SUCCESS;

  switch (nodeType(pNode)) {
    case QUERY_NODE_LOGIC_PLAN_SCAN:
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      if (TSDB_SUPER_TABLE != ((SScanLogicNode*)pNode)->tableType) {
1001
        return nodesListMakeAppend(pScanNodes, (SNode*)pNode);
1002 1003
      }
      break;
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    case QUERY_NODE_LOGIC_PLAN_JOIN:
1005 1006
      code =
          sortPriKeyOptGetScanNodesImpl((SLogicNode*)nodesListGetNode(pNode->pChildren, 0), pNotOptimize, pScanNodes);
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      if (TSDB_CODE_SUCCESS == code) {
1008 1009
        code =
            sortPriKeyOptGetScanNodesImpl((SLogicNode*)nodesListGetNode(pNode->pChildren, 1), pNotOptimize, pScanNodes);
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      }
      return code;
    case QUERY_NODE_LOGIC_PLAN_AGG:
      *pNotOptimize = true;
      return code;
    default:
      break;
  }

  if (1 != LIST_LENGTH(pNode->pChildren)) {
    *pNotOptimize = true;
1021
    return TSDB_CODE_SUCCESS;
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  }

1024
  return sortPriKeyOptGetScanNodesImpl((SLogicNode*)nodesListGetNode(pNode->pChildren, 0), pNotOptimize, pScanNodes);
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}

1027
static int32_t sortPriKeyOptGetScanNodes(SLogicNode* pNode, SNodeList** pScanNodes) {
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  bool    notOptimize = false;
1029
  int32_t code = sortPriKeyOptGetScanNodesImpl(pNode, &notOptimize, pScanNodes);
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  if (TSDB_CODE_SUCCESS != code || notOptimize) {
    nodesClearList(*pScanNodes);
  }
  return code;
}

1036
static EOrder sortPriKeyOptGetPriKeyOrder(SSortLogicNode* pSort) {
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  return ((SOrderByExprNode*)nodesListGetNode(pSort->pSortKeys, 0))->order;
}

1040 1041 1042
static int32_t sortPriKeyOptApply(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SSortLogicNode* pSort,
                                  SNodeList* pScanNodes) {
  EOrder order = sortPriKeyOptGetPriKeyOrder(pSort);
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  if (ORDER_DESC == order) {
1044 1045 1046 1047 1048 1049 1050
    SNode* pScanNode = NULL;
    FOREACH(pScanNode, pScanNodes) {
      SScanLogicNode* pScan = (SScanLogicNode*)pScanNode;
      if (pScan->scanSeq[0] > 0) {
        TSWAP(pScan->scanSeq[0], pScan->scanSeq[1]);
      }
    }
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  }
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1053 1054 1055 1056 1057
  int32_t code =
      replaceLogicNode(pLogicSubplan, (SLogicNode*)pSort, (SLogicNode*)nodesListGetNode(pSort->node.pChildren, 0));
  if (TSDB_CODE_SUCCESS == code) {
    NODES_CLEAR_LIST(pSort->node.pChildren);
    nodesDestroyNode((SNode*)pSort);
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  }
1059
  pCxt->optimized = true;
1060
  return code;
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}

1063
static int32_t sortPrimaryKeyOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SSortLogicNode* pSort) {
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  SNodeList* pScanNodes = NULL;
1065
  int32_t    code = sortPriKeyOptGetScanNodes((SLogicNode*)nodesListGetNode(pSort->node.pChildren, 0), &pScanNodes);
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  if (TSDB_CODE_SUCCESS == code && NULL != pScanNodes) {
1067
    code = sortPriKeyOptApply(pCxt, pLogicSubplan, pSort, pScanNodes);
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  }
  nodesClearList(pScanNodes);
  return code;
}

1073 1074
static int32_t sortPrimaryKeyOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SSortLogicNode* pSort = (SSortLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, sortPriKeyOptMayBeOptimized);
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  if (NULL == pSort) {
    return TSDB_CODE_SUCCESS;
  }
1078
  return sortPrimaryKeyOptimizeImpl(pCxt, pLogicSubplan, pSort);
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}

1081
static bool smaIndexOptMayBeOptimized(SLogicNode* pNode) {
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  if (QUERY_NODE_LOGIC_PLAN_SCAN != nodeType(pNode) || NULL == pNode->pParent ||
      QUERY_NODE_LOGIC_PLAN_WINDOW != nodeType(pNode->pParent) ||
      WINDOW_TYPE_INTERVAL != ((SWindowLogicNode*)pNode->pParent)->winType) {
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    return false;
  }

  SScanLogicNode* pScan = (SScanLogicNode*)pNode;
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  if (NULL == pScan->pSmaIndexes || NULL != pScan->node.pConditions) {
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    return false;
  }

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  return true;
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}

1096 1097
static int32_t smaIndexOptCreateMerge(SLogicNode* pChild, SNodeList* pMergeKeys, SNodeList* pTargets,
                                      SLogicNode** pOutput) {
1098
  SMergeLogicNode* pMerge = (SMergeLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_MERGE);
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  if (NULL == pMerge) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
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  pMerge->node.precision = pChild->precision;
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  pMerge->numOfChannels = 2;
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  pMerge->pMergeKeys = pMergeKeys;
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  pMerge->node.pTargets = pTargets;
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  pMerge->pInputs = nodesCloneList(pChild->pTargets);
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  if (NULL == pMerge->pInputs) {
1108
    nodesDestroyNode((SNode*)pMerge);
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    return TSDB_CODE_OUT_OF_MEMORY;
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  }
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  *pOutput = (SLogicNode*)pMerge;
  return TSDB_CODE_SUCCESS;
}

1116 1117
static int32_t smaIndexOptRecombinationNode(SLogicSubplan* pLogicSubplan, SLogicNode* pInterval, SLogicNode* pMerge,
                                            SLogicNode* pSmaScan) {
1118
  int32_t code = nodesListMakeAppend(&pMerge->pChildren, (SNode*)pInterval);
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  if (TSDB_CODE_SUCCESS == code) {
1120
    code = nodesListMakeAppend(&pMerge->pChildren, (SNode*)pSmaScan);
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  }
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  if (TSDB_CODE_SUCCESS == code) {
    code = replaceLogicNode(pLogicSubplan, pInterval, pMerge);
    pSmaScan->pParent = pMerge;
    pInterval->pParent = pMerge;
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  }
  return code;
}

1130 1131
static int32_t smaIndexOptCreateSmaScan(SScanLogicNode* pScan, STableIndexInfo* pIndex, SNodeList* pCols,
                                        SLogicNode** pOutput) {
1132
  SScanLogicNode* pSmaScan = (SScanLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_SCAN);
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  if (NULL == pSmaScan) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
  pSmaScan->pScanCols = pCols;
  pSmaScan->tableType = TSDB_SUPER_TABLE;
  pSmaScan->tableId = pIndex->dstTbUid;
  pSmaScan->stableId = pIndex->dstTbUid;
  pSmaScan->scanType = SCAN_TYPE_TABLE;
  pSmaScan->scanSeq[0] = pScan->scanSeq[0];
  pSmaScan->scanSeq[1] = pScan->scanSeq[1];
  pSmaScan->scanRange = pScan->scanRange;
  pSmaScan->dataRequired = FUNC_DATA_REQUIRED_DATA_LOAD;

  pSmaScan->pVgroupList = taosMemoryCalloc(1, sizeof(SVgroupsInfo) + sizeof(SVgroupInfo));
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  pSmaScan->node.pTargets = nodesCloneList(pCols);
  if (NULL == pSmaScan->pVgroupList || NULL == pSmaScan->node.pTargets) {
1149
    nodesDestroyNode((SNode*)pSmaScan);
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    return TSDB_CODE_OUT_OF_MEMORY;
  }
  pSmaScan->pVgroupList->numOfVgroups = 1;
  pSmaScan->pVgroupList->vgroups[0].vgId = pIndex->dstVgId;
  memcpy(&(pSmaScan->pVgroupList->vgroups[0].epSet), &pIndex->epSet, sizeof(SEpSet));

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  *pOutput = (SLogicNode*)pSmaScan;
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  return TSDB_CODE_SUCCESS;
}

1160
static bool smaIndexOptEqualInterval(SScanLogicNode* pScan, SWindowLogicNode* pWindow, STableIndexInfo* pIndex) {
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  if (pWindow->interval != pIndex->interval || pWindow->intervalUnit != pIndex->intervalUnit ||
      pWindow->offset != pIndex->offset || pWindow->sliding != pIndex->sliding ||
      pWindow->slidingUnit != pIndex->slidingUnit) {
    return false;
  }
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  if (IS_TSWINDOW_SPECIFIED(pScan->scanRange)) {
    SInterval interval = {.interval = pIndex->interval,
                          .intervalUnit = pIndex->intervalUnit,
                          .offset = pIndex->offset,
                          .offsetUnit = TIME_UNIT_MILLISECOND,
                          .sliding = pIndex->sliding,
                          .slidingUnit = pIndex->slidingUnit,
                          .precision = pScan->node.precision};
    return (pScan->scanRange.skey == taosTimeTruncate(pScan->scanRange.skey, &interval, pScan->node.precision)) &&
           (pScan->scanRange.ekey + 1 == taosTimeTruncate(pScan->scanRange.ekey + 1, &interval, pScan->node.precision));
  }
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  return true;
}

1180
static SNode* smaIndexOptCreateSmaCol(SNode* pFunc, uint64_t tableId, int32_t colId) {
1181
  SColumnNode* pCol = (SColumnNode*)nodesMakeNode(QUERY_NODE_COLUMN);
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  if (NULL == pCol) {
    return NULL;
  }
  pCol->tableId = tableId;
  pCol->tableType = TSDB_SUPER_TABLE;
  pCol->colId = colId;
  pCol->colType = COLUMN_TYPE_COLUMN;
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  strcpy(pCol->colName, ((SExprNode*)pFunc)->aliasName);
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  pCol->node.resType = ((SExprNode*)pFunc)->resType;
  strcpy(pCol->node.aliasName, ((SExprNode*)pFunc)->aliasName);
  return (SNode*)pCol;
}

1195
static int32_t smaIndexOptFindSmaFunc(SNode* pQueryFunc, SNodeList* pSmaFuncs) {
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  int32_t index = 0;
  SNode*  pSmaFunc = NULL;
  FOREACH(pSmaFunc, pSmaFuncs) {
    if (nodesEqualNode(pQueryFunc, pSmaFunc)) {
      return index;
    }
    ++index;
  }
  return -1;
}

1207 1208
static int32_t smaIndexOptCreateSmaCols(SNodeList* pFuncs, uint64_t tableId, SNodeList* pSmaFuncs, SNodeList** pOutput,
                                        int32_t* pWStrartIndex) {
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  SNodeList* pCols = NULL;
  SNode*     pFunc = NULL;
  int32_t    code = TSDB_CODE_SUCCESS;
  int32_t    index = 0;
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  int32_t    smaFuncIndex = -1;
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  *pWStrartIndex = -1;
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  FOREACH(pFunc, pFuncs) {
1216
    if (FUNCTION_TYPE_WSTART == ((SFunctionNode*)pFunc)->funcType) {
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      *pWStrartIndex = index;
    }
1219
    smaFuncIndex = smaIndexOptFindSmaFunc(pFunc, pSmaFuncs);
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    if (smaFuncIndex < 0) {
      break;
    } else {
1223
      code = nodesListMakeStrictAppend(&pCols, smaIndexOptCreateSmaCol(pFunc, tableId, smaFuncIndex + 1));
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      if (TSDB_CODE_SUCCESS != code) {
        break;
      }
    }
    ++index;
  }

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  if (TSDB_CODE_SUCCESS == code && smaFuncIndex >= 0) {
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    *pOutput = pCols;
  } else {
    nodesDestroyList(pCols);
  }

  return code;
}

1240 1241
static int32_t smaIndexOptCouldApplyIndex(SScanLogicNode* pScan, STableIndexInfo* pIndex, SNodeList** pCols,
                                          int32_t* pWStrartIndex) {
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  SWindowLogicNode* pWindow = (SWindowLogicNode*)pScan->node.pParent;
1243
  if (!smaIndexOptEqualInterval(pScan, pWindow, pIndex)) {
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    return TSDB_CODE_SUCCESS;
  }
  SNodeList* pSmaFuncs = NULL;
  int32_t    code = nodesStringToList(pIndex->expr, &pSmaFuncs);
  if (TSDB_CODE_SUCCESS == code) {
1249
    code = smaIndexOptCreateSmaCols(pWindow->pFuncs, pIndex->dstTbUid, pSmaFuncs, pCols, pWStrartIndex);
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  }
  nodesDestroyList(pSmaFuncs);
  return code;
}

1255
static SNode* smaIndexOptCreateWStartTs() {
1256
  SFunctionNode* pWStart = (SFunctionNode*)nodesMakeNode(QUERY_NODE_FUNCTION);
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  if (NULL == pWStart) {
    return NULL;
  }
1260
  strcpy(pWStart->functionName, "_wstart");
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  snprintf(pWStart->node.aliasName, sizeof(pWStart->node.aliasName), "%s.%p", pWStart->functionName, pWStart);
  if (TSDB_CODE_SUCCESS != fmGetFuncInfo(pWStart, NULL, 0)) {
1263
    nodesDestroyNode((SNode*)pWStart);
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    return NULL;
  }
  return (SNode*)pWStart;
}

1269
static int32_t smaIndexOptCreateMergeKey(SNode* pCol, SNodeList** pMergeKeys) {
1270
  SOrderByExprNode* pMergeKey = (SOrderByExprNode*)nodesMakeNode(QUERY_NODE_ORDER_BY_EXPR);
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  if (NULL == pMergeKey) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
  pMergeKey->pExpr = nodesCloneNode(pCol);
  if (NULL == pMergeKey->pExpr) {
1276
    nodesDestroyNode((SNode*)pMergeKey);
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    return TSDB_CODE_OUT_OF_MEMORY;
  }
  pMergeKey->order = ORDER_ASC;
  pMergeKey->nullOrder = NULL_ORDER_FIRST;
1281
  return nodesListMakeStrictAppend(pMergeKeys, (SNode*)pMergeKey);
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}

1284
static int32_t smaIndexOptRewriteInterval(SWindowLogicNode* pInterval, int32_t wstrartIndex, SNodeList** pMergeKeys) {
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  if (wstrartIndex < 0) {
1286
    SNode* pWStart = smaIndexOptCreateWStartTs();
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    if (NULL == pWStart) {
      return TSDB_CODE_OUT_OF_MEMORY;
    }
    int32_t code = createColumnByRewriteExpr(pWStart, &pInterval->node.pTargets);
    if (TSDB_CODE_SUCCESS != code) {
      nodesDestroyNode(pWStart);
      return code;
    }
    wstrartIndex = LIST_LENGTH(pInterval->node.pTargets) - 1;
  }
1297
  return smaIndexOptCreateMergeKey(nodesListGetNode(pInterval->node.pTargets, wstrartIndex), pMergeKeys);
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}

1300 1301
static int32_t smaIndexOptApplyIndexExt(SLogicSubplan* pLogicSubplan, SScanLogicNode* pScan, STableIndexInfo* pIndex,
                                        SNodeList* pSmaCols, int32_t wstrartIndex) {
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  SWindowLogicNode* pInterval = (SWindowLogicNode*)pScan->node.pParent;
  SNodeList*        pMergeTargets = nodesCloneList(pInterval->node.pTargets);
  if (NULL == pMergeTargets) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
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  SLogicNode* pSmaScan = NULL;
  SLogicNode* pMerge = NULL;
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  SNodeList*  pMergeKeys = NULL;
1310
  int32_t     code = smaIndexOptRewriteInterval(pInterval, wstrartIndex, &pMergeKeys);
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  if (TSDB_CODE_SUCCESS == code) {
1312
    code = smaIndexOptCreateSmaScan(pScan, pIndex, pSmaCols, &pSmaScan);
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  }
  if (TSDB_CODE_SUCCESS == code) {
1315
    code = smaIndexOptCreateMerge(pScan->node.pParent, pMergeKeys, pMergeTargets, &pMerge);
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  }
  if (TSDB_CODE_SUCCESS == code) {
1318
    code = smaIndexOptRecombinationNode(pLogicSubplan, pScan->node.pParent, pMerge, pSmaScan);
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  }
  return code;
}

1323 1324
static int32_t smaIndexOptApplyIndex(SLogicSubplan* pLogicSubplan, SScanLogicNode* pScan, STableIndexInfo* pIndex,
                                     SNodeList* pSmaCols, int32_t wstrartIndex) {
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  SLogicNode* pSmaScan = NULL;
1326
  int32_t     code = smaIndexOptCreateSmaScan(pScan, pIndex, pSmaCols, &pSmaScan);
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  if (TSDB_CODE_SUCCESS == code) {
    code = replaceLogicNode(pLogicSubplan, pScan->node.pParent, pSmaScan);
  }
  return code;
}

1333
static void smaIndexOptDestroySmaIndex(void* p) { taosMemoryFree(((STableIndexInfo*)p)->expr); }
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1335
static int32_t smaIndexOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SScanLogicNode* pScan) {
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  int32_t code = TSDB_CODE_SUCCESS;
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  int32_t nindexes = taosArrayGetSize(pScan->pSmaIndexes);
  for (int32_t i = 0; i < nindexes; ++i) {
    STableIndexInfo* pIndex = taosArrayGet(pScan->pSmaIndexes, i);
    SNodeList*       pSmaCols = NULL;
    int32_t          wstrartIndex = -1;
1342
    code = smaIndexOptCouldApplyIndex(pScan, pIndex, &pSmaCols, &wstrartIndex);
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    if (TSDB_CODE_SUCCESS == code && NULL != pSmaCols) {
1344 1345
      code = smaIndexOptApplyIndex(pLogicSubplan, pScan, pIndex, pSmaCols, wstrartIndex);
      taosArrayDestroyEx(pScan->pSmaIndexes, smaIndexOptDestroySmaIndex);
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      pScan->pSmaIndexes = NULL;
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      pCxt->optimized = true;
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      break;
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    }
  }
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  return code;
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}
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static int32_t smaIndexOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SScanLogicNode* pScan = (SScanLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, smaIndexOptMayBeOptimized);
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  if (NULL == pScan) {
    return TSDB_CODE_SUCCESS;
  }
1359
  return smaIndexOptimizeImpl(pCxt, pLogicSubplan, pScan);
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}

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static EDealRes partTagsOptHasColImpl(SNode* pNode, void* pContext) {
  if (QUERY_NODE_COLUMN == nodeType(pNode)) {
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    if (COLUMN_TYPE_TAG != ((SColumnNode*)pNode)->colType && COLUMN_TYPE_TBNAME != ((SColumnNode*)pNode)->colType) {
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      *(bool*)pContext = true;
      return DEAL_RES_END;
    }
  }
  return DEAL_RES_CONTINUE;
}

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static bool planOptNodeListHasCol(SNodeList* pKeys) {
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  bool hasCol = false;
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  nodesWalkExprs(pKeys, partTagsOptHasColImpl, &hasCol);
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  return hasCol;
}

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static bool partTagsIsOptimizableNode(SLogicNode* pNode) {
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  return ((QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pNode) ||
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           (QUERY_NODE_LOGIC_PLAN_AGG == nodeType(pNode) && NULL != ((SAggLogicNode*)pNode)->pGroupKeys &&
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            NULL != ((SAggLogicNode*)pNode)->pAggFuncs)) &&
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          1 == LIST_LENGTH(pNode->pChildren) &&
          QUERY_NODE_LOGIC_PLAN_SCAN == nodeType(nodesListGetNode(pNode->pChildren, 0)));
}

static SNodeList* partTagsGetPartKeys(SLogicNode* pNode) {
  if (QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pNode)) {
    return ((SPartitionLogicNode*)pNode)->pPartitionKeys;
  } else {
    return ((SAggLogicNode*)pNode)->pGroupKeys;
  }
}

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static SNodeList* partTagsGetFuncs(SLogicNode* pNode) {
  if (QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pNode)) {
    return NULL;
  } else {
    return ((SAggLogicNode*)pNode)->pAggFuncs;
  }
}

static bool partTagsOptAreSupportedFuncs(SNodeList* pFuncs) {
  SNode* pFunc = NULL;
  FOREACH(pFunc, pFuncs) {
    if (fmIsIndefiniteRowsFunc(((SFunctionNode*)pFunc)->funcId) && !fmIsSelectFunc(((SFunctionNode*)pFunc)->funcId)) {
      return false;
    }
  }
  return true;
}

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static bool partTagsOptMayBeOptimized(SLogicNode* pNode) {
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  if (!partTagsIsOptimizableNode(pNode)) {
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    return false;
  }

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  return !planOptNodeListHasCol(partTagsGetPartKeys(pNode)) && partTagsOptAreSupportedFuncs(partTagsGetFuncs(pNode));
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}

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static int32_t partTagsOptRebuildTbanme(SNodeList* pPartKeys) {
  int32_t code = TSDB_CODE_SUCCESS;
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  nodesRewriteExprs(pPartKeys, optRebuildTbanme, &code);
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  return code;
}

1426 1427 1428 1429 1430
// todo refact: just to mask compilation warnings
static void partTagsSetAlias(char* pAlias, int32_t len, const char* pTableAlias, const char* pColName) {
  snprintf(pAlias, len, "%s.%s", pTableAlias, pColName);
}

1431
static SNode* partTagsCreateWrapperFunc(const char* pFuncName, SNode* pNode) {
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  SFunctionNode* pFunc = (SFunctionNode*)nodesMakeNode(QUERY_NODE_FUNCTION);
  if (NULL == pFunc) {
    return NULL;
  }

1437
  strcpy(pFunc->functionName, pFuncName);
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  if (QUERY_NODE_COLUMN == nodeType(pNode) && COLUMN_TYPE_TBNAME != ((SColumnNode*)pNode)->colType) {
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    SColumnNode* pCol = (SColumnNode*)pNode;
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    partTagsSetAlias(pFunc->node.aliasName, sizeof(pFunc->node.aliasName), pCol->tableAlias, pCol->colName);
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  } else {
    strcpy(pFunc->node.aliasName, ((SExprNode*)pNode)->aliasName);
  }
  int32_t code = nodesListMakeStrictAppend(&pFunc->pParameterList, nodesCloneNode(pNode));
  if (TSDB_CODE_SUCCESS == code) {
    code = fmGetFuncInfo(pFunc, NULL, 0);
  }

  if (TSDB_CODE_SUCCESS != code) {
    nodesDestroyNode((SNode*)pFunc);
    return NULL;
  }

  return (SNode*)pFunc;
}

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static bool partTagsHasIndefRowsSelectFunc(SNodeList* pFuncs) {
  SNode* pFunc = NULL;
  FOREACH(pFunc, pFuncs) {
    if (fmIsIndefiniteRowsFunc(((SFunctionNode*)pFunc)->funcId)) {
      return true;
    }
  }
  return false;
}

static int32_t partTagsRewriteGroupTagsToFuncs(SNodeList* pGroupTags, SNodeList* pAggFuncs) {
  bool    hasIndefRowsSelectFunc = partTagsHasIndefRowsSelectFunc(pAggFuncs);
  int32_t code = TSDB_CODE_SUCCESS;
  SNode*  pNode = NULL;
1471
  FOREACH(pNode, pGroupTags) {
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    if (hasIndefRowsSelectFunc) {
      code = nodesListStrictAppend(pAggFuncs, partTagsCreateWrapperFunc("_select_value", pNode));
    } else {
      code = nodesListStrictAppend(pAggFuncs, partTagsCreateWrapperFunc("_group_key", pNode));
    }
1477
    if (TSDB_CODE_SUCCESS != code) {
1478
      break;
1479 1480
    }
  }
1481
  return code;
1482 1483
}

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static int32_t partTagsOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
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  SLogicNode* pNode = optFindPossibleNode(pLogicSubplan->pNode, partTagsOptMayBeOptimized);
  if (NULL == pNode) {
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    return TSDB_CODE_SUCCESS;
  }

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  int32_t         code = TSDB_CODE_SUCCESS;
  SScanLogicNode* pScan = (SScanLogicNode*)nodesListGetNode(pNode->pChildren, 0);
  if (QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pNode)) {
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    TSWAP(((SPartitionLogicNode*)pNode)->pPartitionKeys, pScan->pGroupTags);
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    int32_t code = replaceLogicNode(pLogicSubplan, pNode, (SLogicNode*)pScan);
    if (TSDB_CODE_SUCCESS == code) {
      NODES_CLEAR_LIST(pNode->pChildren);
      nodesDestroyNode((SNode*)pNode);
    }
  } else {
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    SAggLogicNode* pAgg = (SAggLogicNode*)pNode;
    SNode*         pGroupKey = NULL;
    FOREACH(pGroupKey, pAgg->pGroupKeys) {
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      code = nodesListMakeStrictAppend(
1504
          &pScan->pGroupTags, nodesCloneNode(nodesListGetNode(((SGroupingSetNode*)pGroupKey)->pParameterList, 0)));
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      if (TSDB_CODE_SUCCESS != code) {
        break;
      }
    }
1509
    NODES_DESTORY_LIST(pAgg->pGroupKeys);
1510
    code = partTagsRewriteGroupTagsToFuncs(pScan->pGroupTags, pAgg->pAggFuncs);
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  }
  if (TSDB_CODE_SUCCESS == code) {
1513
    code = partTagsOptRebuildTbanme(pScan->pGroupTags);
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  }
  return code;
}

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static bool eliminateProjOptCheckProjColumnNames(SProjectLogicNode* pProjectNode) {
  SHashObj* pProjColNameHash = taosHashInit(16, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_NO_LOCK);
  SNode*    pProjection;
  FOREACH(pProjection, pProjectNode->pProjections) {
    char*    projColumnName = ((SColumnNode*)pProjection)->colName;
    int32_t* pExist = taosHashGet(pProjColNameHash, projColumnName, strlen(projColumnName));
    if (NULL != pExist) {
      taosHashCleanup(pProjColNameHash);
      return false;
    } else {
      int32_t exist = 1;
      taosHashPut(pProjColNameHash, projColumnName, strlen(projColumnName), &exist, sizeof(exist));
    }
  }
  taosHashCleanup(pProjColNameHash);
  return true;
}

1536
static bool eliminateProjOptMayBeOptimized(SLogicNode* pNode) {
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  // TODO: enable this optimization after new mechanising that map projection and targets of project node
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  if (NULL != pNode->pParent) {
    return false;
  }
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  if (QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pNode) || 1 != LIST_LENGTH(pNode->pChildren)) {
    return false;
  }

  SProjectLogicNode* pProjectNode = (SProjectLogicNode*)pNode;
1547 1548
  if (NULL != pProjectNode->node.pLimit || NULL != pProjectNode->node.pSlimit ||
      NULL != pProjectNode->node.pConditions) {
1549 1550 1551
    return false;
  }

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  SNode* pProjection;
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  FOREACH(pProjection, pProjectNode->pProjections) {
    SExprNode* pExprNode = (SExprNode*)pProjection;
    if (QUERY_NODE_COLUMN != nodeType(pExprNode)) {
      return false;
    }
  }
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  return eliminateProjOptCheckProjColumnNames(pProjectNode);
1561 1562
}

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static int32_t eliminateProjOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan,
                                         SProjectLogicNode* pProjectNode) {
1565
  SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pProjectNode->node.pChildren, 0);
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  SNodeList*  pNewChildTargets = nodesMakeList();
1567 1568 1569 1570 1571

  SNode* pProjection = NULL;
  FOREACH(pProjection, pProjectNode->pProjections) {
    SNode* pChildTarget = NULL;
    FOREACH(pChildTarget, pChild->pTargets) {
1572
      if (strcmp(((SColumnNode*)pProjection)->colName, ((SColumnNode*)pChildTarget)->colName) == 0) {
1573
        nodesListAppend(pNewChildTargets, nodesCloneNode(pChildTarget));
1574
        break;
1575 1576 1577
      }
    }
  }
1578 1579
  nodesDestroyList(pChild->pTargets);
  pChild->pTargets = pNewChildTargets;
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1581 1582 1583 1584 1585
  int32_t code = replaceLogicNode(pLogicSubplan, (SLogicNode*)pProjectNode, pChild);
  if (TSDB_CODE_SUCCESS == code) {
    NODES_CLEAR_LIST(pProjectNode->node.pChildren);
    nodesDestroyNode((SNode*)pProjectNode);
  }
1586
  pCxt->optimized = true;
1587 1588 1589 1590 1591
  return code;
}

static int32_t eliminateProjOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SProjectLogicNode* pProjectNode =
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      (SProjectLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, eliminateProjOptMayBeOptimized);
1593 1594 1595 1596 1597 1598 1599 1600

  if (NULL == pProjectNode) {
    return TSDB_CODE_SUCCESS;
  }

  return eliminateProjOptimizeImpl(pCxt, pLogicSubplan, pProjectNode);
}

1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630
static bool rewriteTailOptMayBeOptimized(SLogicNode* pNode) {
  return QUERY_NODE_LOGIC_PLAN_INDEF_ROWS_FUNC == nodeType(pNode) && ((SIndefRowsFuncLogicNode*)pNode)->isTailFunc;
}

static SNode* rewriteTailOptCreateOrderByExpr(SNode* pSortKey) {
  SOrderByExprNode* pOrder = (SOrderByExprNode*)nodesMakeNode(QUERY_NODE_ORDER_BY_EXPR);
  if (NULL == pOrder) {
    return NULL;
  }
  pOrder->order = ORDER_DESC;
  pOrder->pExpr = nodesCloneNode(pSortKey);
  if (NULL == pOrder->pExpr) {
    nodesDestroyNode((SNode*)pOrder);
    return NULL;
  }
  return (SNode*)pOrder;
}

static int32_t rewriteTailOptCreateLimit(SNode* pLimit, SNode* pOffset, SNode** pOutput) {
  SLimitNode* pLimitNode = (SLimitNode*)nodesMakeNode(QUERY_NODE_LIMIT);
  if (NULL == pLimitNode) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }
  pLimitNode->limit = NULL == pLimit ? -1 : ((SValueNode*)pLimit)->datum.i;
  pLimitNode->offset = NULL == pOffset ? -1 : ((SValueNode*)pOffset)->datum.i;
  *pOutput = (SNode*)pLimitNode;
  return TSDB_CODE_SUCCESS;
}

static bool rewriteTailOptNeedGroupSort(SIndefRowsFuncLogicNode* pIndef) {
1631 1632 1633 1634 1635
  if (1 != LIST_LENGTH(pIndef->node.pChildren)) {
    return false;
  }
  SNode* pChild = nodesListGetNode(pIndef->node.pChildren, 0);
  return QUERY_NODE_LOGIC_PLAN_PARTITION == nodeType(pChild) ||
1636
         (QUERY_NODE_LOGIC_PLAN_SCAN == nodeType(pChild) && NULL != ((SScanLogicNode*)pChild)->pGroupTags);
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
}

static int32_t rewriteTailOptCreateSort(SIndefRowsFuncLogicNode* pIndef, SLogicNode** pOutput) {
  SSortLogicNode* pSort = (SSortLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_SORT);
  if (NULL == pSort) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  pSort->groupSort = rewriteTailOptNeedGroupSort(pIndef);
  TSWAP(pSort->node.pChildren, pIndef->node.pChildren);
1647
  optResetParent((SLogicNode*)pSort);
1648 1649
  pSort->node.precision = pIndef->node.precision;

1650 1651 1652 1653 1654 1655 1656 1657 1658
  SFunctionNode* pTail = NULL;
  SNode*         pFunc = NULL;
  FOREACH(pFunc, pIndef->pFuncs) {
    if (FUNCTION_TYPE_TAIL == ((SFunctionNode*)pFunc)->funcType) {
      pTail = (SFunctionNode*)pFunc;
      break;
    }
  }

1659
  // tail(expr, [limit, offset,] _rowts)
1660
  int32_t rowtsIndex = LIST_LENGTH(pTail->pParameterList) - 1;
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679

  int32_t code = nodesListMakeStrictAppend(
      &pSort->pSortKeys, rewriteTailOptCreateOrderByExpr(nodesListGetNode(pTail->pParameterList, rowtsIndex)));
  if (TSDB_CODE_SUCCESS == code) {
    pSort->node.pTargets = nodesCloneList(((SLogicNode*)nodesListGetNode(pSort->node.pChildren, 0))->pTargets);
    if (NULL == pSort->node.pTargets) {
      code = TSDB_CODE_OUT_OF_MEMORY;
    }
  }

  if (TSDB_CODE_SUCCESS == code) {
    *pOutput = (SLogicNode*)pSort;
  } else {
    nodesDestroyNode((SNode*)pSort);
  }

  return code;
}

1680 1681
static SNode* rewriteTailOptCreateProjectExpr(SFunctionNode* pFunc) {
  SNode* pExpr = nodesCloneNode(nodesListGetNode(pFunc->pParameterList, 0));
1682 1683 1684
  if (NULL == pExpr) {
    return NULL;
  }
1685
  strcpy(((SExprNode*)pExpr)->aliasName, pFunc->node.aliasName);
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
  return pExpr;
}

static int32_t rewriteTailOptCreateProject(SIndefRowsFuncLogicNode* pIndef, SLogicNode** pOutput) {
  SProjectLogicNode* pProject = (SProjectLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_PROJECT);
  if (NULL == pProject) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  TSWAP(pProject->node.pTargets, pIndef->node.pTargets);
  pProject->node.precision = pIndef->node.precision;

1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
  int32_t        code = TSDB_CODE_SUCCESS;
  SFunctionNode* pTail = NULL;
  SNode*         pFunc = NULL;
  FOREACH(pFunc, pIndef->pFuncs) {
    code = nodesListMakeStrictAppend(&pProject->pProjections, rewriteTailOptCreateProjectExpr((SFunctionNode*)pFunc));
    if (TSDB_CODE_SUCCESS != code) {
      break;
    }
    if (FUNCTION_TYPE_TAIL == ((SFunctionNode*)pFunc)->funcType) {
      pTail = (SFunctionNode*)pFunc;
    }
  }
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1711 1712 1713
  // tail(expr, [limit, offset,] _rowts)
  int32_t limitIndex = LIST_LENGTH(pTail->pParameterList) > 2 ? 1 : -1;
  int32_t offsetIndex = LIST_LENGTH(pTail->pParameterList) > 3 ? 2 : -1;
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  if (TSDB_CODE_SUCCESS == code) {
    code = rewriteTailOptCreateLimit(limitIndex < 0 ? NULL : nodesListGetNode(pTail->pParameterList, limitIndex),
                                     offsetIndex < 0 ? NULL : nodesListGetNode(pTail->pParameterList, offsetIndex),
                                     &pProject->node.pLimit);
  }
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
  if (TSDB_CODE_SUCCESS == code) {
    *pOutput = (SLogicNode*)pProject;
  } else {
    nodesDestroyNode((SNode*)pProject);
  }
  return code;
}

static int32_t rewriteTailOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan,
                                       SIndefRowsFuncLogicNode* pIndef) {
  SLogicNode* pSort = NULL;
  SLogicNode* pProject = NULL;
  int32_t     code = rewriteTailOptCreateSort(pIndef, &pSort);
  if (TSDB_CODE_SUCCESS == code) {
    code = rewriteTailOptCreateProject(pIndef, &pProject);
  }
  if (TSDB_CODE_SUCCESS == code) {
    code = nodesListMakeAppend(&pProject->pChildren, (SNode*)pSort);
    pSort->pParent = pProject;
    pSort = NULL;
  }
  if (TSDB_CODE_SUCCESS == code) {
    code = replaceLogicNode(pLogicSubplan, (SLogicNode*)pIndef, pProject);
  }
  if (TSDB_CODE_SUCCESS == code) {
    nodesDestroyNode((SNode*)pIndef);
  } else {
    nodesDestroyNode((SNode*)pSort);
    nodesDestroyNode((SNode*)pProject);
  }
1749
  pCxt->optimized = true;
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
  return code;
}

static int32_t rewriteTailOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SIndefRowsFuncLogicNode* pIndef =
      (SIndefRowsFuncLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, rewriteTailOptMayBeOptimized);

  if (NULL == pIndef) {
    return TSDB_CODE_SUCCESS;
  }

  return rewriteTailOptimizeImpl(pCxt, pLogicSubplan, pIndef);
}

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static bool eliminateSetOpMayBeOptimized(SLogicNode* pNode) {
  SLogicNode* pParent = pNode->pParent;
  if (NULL == pParent ||
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      QUERY_NODE_LOGIC_PLAN_AGG != nodeType(pParent) && QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pParent) ||
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      LIST_LENGTH(pParent->pChildren) < 2) {
    return false;
  }
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  if (nodeType(pNode) != nodeType(pNode->pParent) || LIST_LENGTH(pNode->pChildren) < 2) {
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    return false;
  }
  return true;
}

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static int32_t eliminateSetOpOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan,
                                          SLogicNode* pSetOpNode) {
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  SNode* pSibling;
  FOREACH(pSibling, pSetOpNode->pParent->pChildren) {
    if (nodesEqualNode(pSibling, (SNode*)pSetOpNode)) {
      SNode* pChild;
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      FOREACH(pChild, pSetOpNode->pChildren) { ((SLogicNode*)pChild)->pParent = pSetOpNode->pParent; }
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      INSERT_LIST(pSetOpNode->pParent->pChildren, pSetOpNode->pChildren);

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      pSetOpNode->pChildren = NULL;
      ERASE_NODE(pSetOpNode->pParent->pChildren);
1788
      pCxt->optimized = true;
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      return TSDB_CODE_SUCCESS;
    }
  }

  return TSDB_CODE_PLAN_INTERNAL_ERROR;
}

static int32_t eliminateSetOpOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SLogicNode* pSetOpNode = optFindPossibleNode(pLogicSubplan->pNode, eliminateSetOpMayBeOptimized);
  if (NULL == pSetOpNode) {
    return TSDB_CODE_SUCCESS;
  }

  return eliminateSetOpOptimizeImpl(pCxt, pLogicSubplan, pSetOpNode);
}

1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
static bool rewriteUniqueOptMayBeOptimized(SLogicNode* pNode) {
  return QUERY_NODE_LOGIC_PLAN_INDEF_ROWS_FUNC == nodeType(pNode) && ((SIndefRowsFuncLogicNode*)pNode)->isUniqueFunc;
}

static SNode* rewriteUniqueOptCreateGroupingSet(SNode* pExpr) {
  SGroupingSetNode* pGroupingSet = (SGroupingSetNode*)nodesMakeNode(QUERY_NODE_GROUPING_SET);
  if (NULL == pGroupingSet) {
    return NULL;
  }
  pGroupingSet->groupingSetType = GP_TYPE_NORMAL;
  SExprNode* pGroupExpr = (SExprNode*)nodesCloneNode(pExpr);
  if (TSDB_CODE_SUCCESS != nodesListMakeStrictAppend(&pGroupingSet->pParameterList, (SNode*)pGroupExpr)) {
    nodesDestroyNode((SNode*)pGroupingSet);
    return NULL;
  }
  return (SNode*)pGroupingSet;
}

static SNode* rewriteUniqueOptCreateFirstFunc(SFunctionNode* pSelectValue, SNode* pCol) {
  SFunctionNode* pFunc = (SFunctionNode*)nodesMakeNode(QUERY_NODE_FUNCTION);
  if (NULL == pFunc) {
    return NULL;
  }

  strcpy(pFunc->functionName, "first");
  if (NULL != pSelectValue) {
1831
    strcpy(pFunc->node.aliasName, pSelectValue->node.aliasName);
1832
  } else {
1833
    snprintf(pFunc->node.aliasName, sizeof(pFunc->node.aliasName), "%s.%p", pFunc->functionName, pFunc);
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
  }
  int32_t code = nodesListMakeStrictAppend(&pFunc->pParameterList, nodesCloneNode(pCol));
  if (TSDB_CODE_SUCCESS == code) {
    code = fmGetFuncInfo(pFunc, NULL, 0);
  }

  if (TSDB_CODE_SUCCESS != code) {
    nodesDestroyNode((SNode*)pFunc);
    return NULL;
  }

  return (SNode*)pFunc;
}

static int32_t rewriteUniqueOptCreateAgg(SIndefRowsFuncLogicNode* pIndef, SLogicNode** pOutput) {
  SAggLogicNode* pAgg = (SAggLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_AGG);
  if (NULL == pAgg) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  TSWAP(pAgg->node.pChildren, pIndef->node.pChildren);
1855
  optResetParent((SLogicNode*)pAgg);
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
  pAgg->node.precision = pIndef->node.precision;

  int32_t code = TSDB_CODE_SUCCESS;
  bool    hasSelectPrimaryKey = false;
  SNode*  pPrimaryKey = NULL;
  SNode*  pNode = NULL;
  FOREACH(pNode, pIndef->pFuncs) {
    SFunctionNode* pFunc = (SFunctionNode*)pNode;
    SNode*         pExpr = nodesListGetNode(pFunc->pParameterList, 0);
    if (FUNCTION_TYPE_UNIQUE == pFunc->funcType) {
      pPrimaryKey = nodesListGetNode(pFunc->pParameterList, 1);
      code = nodesListMakeStrictAppend(&pAgg->pGroupKeys, rewriteUniqueOptCreateGroupingSet(pExpr));
    } else if (PRIMARYKEY_TIMESTAMP_COL_ID == ((SColumnNode*)pExpr)->colId) {  // _select_value(ts) => first(ts)
      hasSelectPrimaryKey = true;
      code = nodesListMakeStrictAppend(&pAgg->pAggFuncs, rewriteUniqueOptCreateFirstFunc(pFunc, pExpr));
    } else {  // _select_value(other_col)
      code = nodesListMakeStrictAppend(&pAgg->pAggFuncs, nodesCloneNode(pNode));
    }
    if (TSDB_CODE_SUCCESS != code) {
      break;
    }
  }

  if (TSDB_CODE_SUCCESS == code) {
    code = createColumnByRewriteExprs(pAgg->pGroupKeys, &pAgg->node.pTargets);
  }
  if (TSDB_CODE_SUCCESS == code && NULL != pAgg->pAggFuncs) {
    code = createColumnByRewriteExprs(pAgg->pAggFuncs, &pAgg->node.pTargets);
  }

  if (TSDB_CODE_SUCCESS == code && !hasSelectPrimaryKey && NULL != pAgg->pAggFuncs) {
    code = nodesListMakeStrictAppend(&pAgg->pAggFuncs, rewriteUniqueOptCreateFirstFunc(NULL, pPrimaryKey));
  }

  if (TSDB_CODE_SUCCESS == code) {
    *pOutput = (SLogicNode*)pAgg;
  } else {
    nodesDestroyNode((SNode*)pAgg);
  }
  return code;
}

static SNode* rewriteUniqueOptCreateProjectCol(SFunctionNode* pFunc) {
  SColumnNode* pCol = (SColumnNode*)nodesMakeNode(QUERY_NODE_COLUMN);
  if (NULL == pCol) {
    return NULL;
  }

  pCol->node.resType = pFunc->node.resType;
  if (FUNCTION_TYPE_UNIQUE == pFunc->funcType) {
    SExprNode* pExpr = (SExprNode*)nodesListGetNode(pFunc->pParameterList, 0);
    if (QUERY_NODE_COLUMN == nodeType(pExpr)) {
      strcpy(pCol->tableAlias, ((SColumnNode*)pExpr)->tableAlias);
      strcpy(pCol->colName, ((SColumnNode*)pExpr)->colName);
    } else {
      strcpy(pCol->colName, pExpr->aliasName);
    }
  } else {
    strcpy(pCol->colName, pFunc->node.aliasName);
  }
  strcpy(pCol->node.aliasName, pFunc->node.aliasName);

  return (SNode*)pCol;
}

static int32_t rewriteUniqueOptCreateProject(SIndefRowsFuncLogicNode* pIndef, SLogicNode** pOutput) {
  SProjectLogicNode* pProject = (SProjectLogicNode*)nodesMakeNode(QUERY_NODE_LOGIC_PLAN_PROJECT);
  if (NULL == pProject) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  TSWAP(pProject->node.pTargets, pIndef->node.pTargets);
  pProject->node.precision = pIndef->node.precision;

  int32_t code = TSDB_CODE_SUCCESS;
  SNode*  pNode = NULL;
  FOREACH(pNode, pIndef->pFuncs) {
    code = nodesListMakeStrictAppend(&pProject->pProjections, rewriteUniqueOptCreateProjectCol((SFunctionNode*)pNode));
    if (TSDB_CODE_SUCCESS != code) {
      break;
    }
  }

  if (TSDB_CODE_SUCCESS == code) {
    *pOutput = (SLogicNode*)pProject;
  } else {
    nodesDestroyNode((SNode*)pProject);
  }
  return code;
}

static int32_t rewriteUniqueOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan,
                                         SIndefRowsFuncLogicNode* pIndef) {
  SLogicNode* pAgg = NULL;
  SLogicNode* pProject = NULL;
  int32_t     code = rewriteUniqueOptCreateAgg(pIndef, &pAgg);
  if (TSDB_CODE_SUCCESS == code) {
    code = rewriteUniqueOptCreateProject(pIndef, &pProject);
  }
  if (TSDB_CODE_SUCCESS == code) {
    code = nodesListMakeAppend(&pProject->pChildren, (SNode*)pAgg);
    pAgg->pParent = pProject;
    pAgg = NULL;
  }
  if (TSDB_CODE_SUCCESS == code) {
    code = replaceLogicNode(pLogicSubplan, (SLogicNode*)pIndef, pProject);
  }
  if (TSDB_CODE_SUCCESS == code) {
    nodesDestroyNode((SNode*)pIndef);
  } else {
    nodesDestroyNode((SNode*)pAgg);
    nodesDestroyNode((SNode*)pProject);
  }
  pCxt->optimized = true;
  return code;
}

static int32_t rewriteUniqueOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SIndefRowsFuncLogicNode* pIndef =
      (SIndefRowsFuncLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, rewriteUniqueOptMayBeOptimized);

  if (NULL == pIndef) {
    return TSDB_CODE_SUCCESS;
  }

  return rewriteUniqueOptimizeImpl(pCxt, pLogicSubplan, pIndef);
}

1984 1985 1986 1987
static bool lastRowScanOptMayBeOptimized(SLogicNode* pNode) {
  if (QUERY_NODE_LOGIC_PLAN_AGG != nodeType(pNode) || !(((SAggLogicNode*)pNode)->hasLastRow) ||
      NULL != ((SAggLogicNode*)pNode)->pGroupKeys || 1 != LIST_LENGTH(pNode->pChildren) ||
      QUERY_NODE_LOGIC_PLAN_SCAN != nodeType(nodesListGetNode(pNode->pChildren, 0)) ||
1988 1989
      NULL != ((SScanLogicNode*)nodesListGetNode(pNode->pChildren, 0))->node.pConditions ||
      0 == ((SScanLogicNode*)nodesListGetNode(pNode->pChildren, 0))->cacheLastMode) {
1990 1991 1992 1993 1994
    return false;
  }

  SNode* pFunc = NULL;
  FOREACH(pFunc, ((SAggLogicNode*)pNode)->pAggFuncs) {
1995 1996
    if (FUNCTION_TYPE_LAST_ROW != ((SFunctionNode*)pFunc)->funcType &&
        FUNCTION_TYPE_SELECT_VALUE != ((SFunctionNode*)pFunc)->funcType) {
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
      return false;
    }
  }

  return true;
}

static int32_t lastRowScanOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SAggLogicNode* pAgg = (SAggLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, lastRowScanOptMayBeOptimized);

  if (NULL == pAgg) {
    return TSDB_CODE_SUCCESS;
  }

  SNode* pNode = NULL;
  FOREACH(pNode, pAgg->pAggFuncs) {
    SFunctionNode* pFunc = (SFunctionNode*)pNode;
2014 2015 2016 2017 2018 2019 2020
    if (FUNCTION_TYPE_LAST_ROW == pFunc->funcType) {
      int32_t len = snprintf(pFunc->functionName, sizeof(pFunc->functionName), "_cache_last_row");
      pFunc->functionName[len] = '\0';
      int32_t code = fmGetFuncInfo(pFunc, NULL, 0);
      if (TSDB_CODE_SUCCESS != code) {
        return code;
      }
2021
    }
2022 2023 2024 2025 2026 2027 2028 2029 2030
  }
  pAgg->hasLastRow = false;

  ((SScanLogicNode*)nodesListGetNode(pAgg->node.pChildren, 0))->scanType = SCAN_TYPE_LAST_ROW;

  pCxt->optimized = true;
  return TSDB_CODE_SUCCESS;
}

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// merge projects
static bool mergeProjectsMayBeOptimized(SLogicNode* pNode) {
  if (QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pNode) || 1 != LIST_LENGTH(pNode->pChildren)) {
    return false;
  }
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  SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pNode->pChildren, 0);
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  if (QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pChild) || 1 < LIST_LENGTH(pChild->pChildren) ||
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      NULL != pChild->pConditions || NULL != pChild->pLimit || NULL != pChild->pSlimit) {
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    return false;
  }
  return true;
}

typedef struct SMergeProjectionsContext {
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  SProjectLogicNode* pChildProj;
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  int32_t            errCode;
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} SMergeProjectionsContext;

static EDealRes mergeProjectionsExpr(SNode** pNode, void* pContext) {
2050
  SMergeProjectionsContext* pCxt = pContext;
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  SProjectLogicNode*        pChildProj = pCxt->pChildProj;
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  if (QUERY_NODE_COLUMN == nodeType(*pNode)) {
    SNode* pTarget;
    FOREACH(pTarget, ((SLogicNode*)pChildProj)->pTargets) {
      if (nodesEqualNode(pTarget, *pNode)) {
        SNode* pProjection;
        FOREACH(pProjection, pChildProj->pProjections) {
          if (0 == strcmp(((SColumnNode*)pTarget)->colName, ((SExprNode*)pProjection)->aliasName)) {
            SNode* pExpr = nodesCloneNode(pProjection);
            if (pExpr == NULL) {
              pCxt->errCode = terrno;
              return DEAL_RES_ERROR;
            }
2064 2065
            snprintf(((SExprNode*)pExpr)->aliasName, sizeof(((SExprNode*)pExpr)->aliasName), "%s",
                     ((SExprNode*)*pNode)->aliasName);
2066 2067
            nodesDestroyNode(*pNode);
            *pNode = pExpr;
2068
            return DEAL_RES_IGNORE_CHILD;
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          }
        }
      }
    }
  }
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  return DEAL_RES_CONTINUE;
}

2077
static int32_t mergeProjectsOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SLogicNode* pSelfNode) {
2078
  SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pSelfNode->pChildren, 0);
2079

2080
  SMergeProjectionsContext cxt = {.pChildProj = (SProjectLogicNode*)pChild, .errCode = TSDB_CODE_SUCCESS};
2081
  nodesRewriteExprs(((SProjectLogicNode*)pSelfNode)->pProjections, mergeProjectionsExpr, &cxt);
2082
  int32_t code = cxt.errCode;
2083

2084 2085 2086 2087 2088
  if (TSDB_CODE_SUCCESS == code) {
    if (1 == LIST_LENGTH(pChild->pChildren)) {
      SLogicNode* pGrandChild = (SLogicNode*)nodesListGetNode(pChild->pChildren, 0);
      code = replaceLogicNode(pLogicSubplan, pChild, pGrandChild);
    } else {  // no grand child
2089
      NODES_CLEAR_LIST(pSelfNode->pChildren);
2090 2091 2092 2093 2094 2095 2096
    }
  }

  if (TSDB_CODE_SUCCESS == code) {
    NODES_CLEAR_LIST(pChild->pChildren);
  }
  nodesDestroyNode((SNode*)pChild);
2097
  pCxt->optimized = true;
2098
  return code;
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}

static int32_t mergeProjectsOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SLogicNode* pProjectNode = optFindPossibleNode(pLogicSubplan->pNode, mergeProjectsMayBeOptimized);
  if (NULL == pProjectNode) {
    return TSDB_CODE_SUCCESS;
  }

  return mergeProjectsOptimizeImpl(pCxt, pLogicSubplan, pProjectNode);
}

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static bool tagScanMayBeOptimized(SLogicNode* pNode) {
  if (QUERY_NODE_LOGIC_PLAN_SCAN != nodeType(pNode) || (SCAN_TYPE_TAG == ((SScanLogicNode*)pNode)->scanType)) {
    return false;
  }
2114
  SScanLogicNode* pScan = (SScanLogicNode*)pNode;
2115 2116 2117
  if (NULL != pScan->pScanCols) {
    return false;
  }
2118 2119
  if (NULL == pNode->pParent || QUERY_NODE_LOGIC_PLAN_AGG != nodeType(pNode->pParent) ||
      1 != LIST_LENGTH(pNode->pParent->pChildren)) {
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    return false;
  }

  SAggLogicNode* pAgg = (SAggLogicNode*)(pNode->pParent);
  if (NULL == pAgg->pGroupKeys || NULL != pAgg->pAggFuncs || planOptNodeListHasCol(pAgg->pGroupKeys)) {
    return false;
  }

  return true;
}

static int32_t tagScanOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
  SScanLogicNode* pScanNode = (SScanLogicNode*)optFindPossibleNode(pLogicSubplan->pNode, tagScanMayBeOptimized);
  if (NULL == pScanNode) {
    return TSDB_CODE_SUCCESS;
  }

  pScanNode->scanType = SCAN_TYPE_TAG;
  pCxt->optimized = true;
  return TSDB_CODE_SUCCESS;
}

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// clang-format off
static const SOptimizeRule optimizeRuleSet[] = {
2144
  {.pName = "ScanPath",                   .optimizeFunc = scanPathOptimize},
2145 2146
  {.pName = "PushDownCondition",          .optimizeFunc = pushDownCondOptimize},
  {.pName = "SortPrimaryKey",             .optimizeFunc = sortPrimaryKeyOptimize},
2147
  {.pName = "SmaIndex",                   .optimizeFunc = smaIndexOptimize},
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  {.pName = "PartitionTags",              .optimizeFunc = partTagsOptimize},
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  {.pName = "MergeProjects",              .optimizeFunc = mergeProjectsOptimize},
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  {.pName = "EliminateProject",           .optimizeFunc = eliminateProjOptimize},
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  {.pName = "EliminateSetOperator",       .optimizeFunc = eliminateSetOpOptimize},
2152
  {.pName = "RewriteTail",                .optimizeFunc = rewriteTailOptimize},
2153
  {.pName = "RewriteUnique",              .optimizeFunc = rewriteUniqueOptimize},
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  {.pName = "LastRowScan",               .optimizeFunc = lastRowScanOptimize},
  {.pName = "TagScan",                   .optimizeFunc = tagScanOptimize}
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};
// clang-format on
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static const int32_t optimizeRuleNum = (sizeof(optimizeRuleSet) / sizeof(SOptimizeRule));

2161 2162 2163
static void dumpLogicSubplan(const char* pRuleName, SLogicSubplan* pSubplan) {
  char* pStr = NULL;
  nodesNodeToString((SNode*)pSubplan, false, &pStr, NULL);
2164 2165 2166 2167 2168
  if (NULL == pRuleName) {
    qDebugL("before optimize: %s", pStr);
  } else {
    qDebugL("apply optimize %s rule: %s", pRuleName, pStr);
  }
2169 2170 2171
  taosMemoryFree(pStr);
}

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static int32_t applyOptimizeRule(SPlanContext* pCxt, SLogicSubplan* pLogicSubplan) {
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  SOptimizeContext cxt = {.pPlanCxt = pCxt, .optimized = false};
2174
  bool             optimized = false;
2175
  dumpLogicSubplan(NULL, pLogicSubplan);
2176
  do {
2177
    optimized = false;
2178
    for (int32_t i = 0; i < optimizeRuleNum; ++i) {
2179
      cxt.optimized = false;
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      int32_t code = optimizeRuleSet[i].optimizeFunc(&cxt, pLogicSubplan);
2181 2182 2183
      if (TSDB_CODE_SUCCESS != code) {
        return code;
      }
2184 2185 2186 2187
      if (cxt.optimized) {
        optimized = true;
        dumpLogicSubplan(optimizeRuleSet[i].pName, pLogicSubplan);
      }
2188
    }
2189
  } while (optimized);
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  return TSDB_CODE_SUCCESS;
}
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int32_t optimizeLogicPlan(SPlanContext* pCxt, SLogicSubplan* pLogicSubplan) {
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  return applyOptimizeRule(pCxt, pLogicSubplan);
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}