Merge pull request #17662 from taosdata/feature/3_liaohj

enh(query): enable the limit clause to be push down

source/libs/executor/inc/executorimpl.h

@@ -321,12 +321,11 @@ typedef struct {
 typedef struct STableScanInfo {
   STsdbReader*           dataReader;
   SReadHandle            readHandle;
-
+  SLimitInfo             limitInfo;
   SFileBlockLoadRecorder readRecorder;
   SScanInfo              scanInfo;
   int32_t                scanTimes;
   SNode*                 pFilterNode;  // filter info, which is push down by optimizer
-
   SSDataBlock*           pResBlock;
   SColMatchInfo          matchInfo;
   SExprSupp              pseudoSup;
@@ -337,7 +336,6 @@ typedef struct STableScanInfo {
   int32_t                currentGroupId;
   int32_t                currentTable;
   int8_t                 scanMode;
-  int8_t               noTable;
   SAggOptrPushDownInfo   pdInfo;
   int8_t                 assignBlockUid;
 } STableScanInfo;
@@ -357,7 +355,7 @@ typedef struct STableMergeScanInfo {
   SSDataBlock*    pSortInputBlock;
   int64_t         startTs;  // sort start time
   SArray*         sortSourceParams;
-
+  SLimitInfo      limitInfo;
   SFileBlockLoadRecorder readRecorder;
   int64_t                numOfRows;
   SScanInfo              scanInfo;
@@ -374,6 +372,7 @@ typedef struct STableMergeScanInfo {
   SQueryTableDataCond    cond;
   int32_t                scanFlag;  // table scan flag to denote if it is a repeat/reverse/main scan
   int32_t                dataBlockLoadFlag;
+
   // if the upstream is an interval operator, the interval info is also kept here to get the time
   // window to check if current data block needs to be loaded.
   SInterval       interval;
@@ -903,6 +902,7 @@ void doBuildResultDatablock(SOperatorInfo* pOperator, SOptrBasicInfo* pbInfo, SG
 int32_t handleLimitOffset(SOperatorInfo* pOperator, SLimitInfo* pLimitInfo, SSDataBlock* pBlock, bool holdDataInBuf);
 bool    hasLimitOffsetInfo(SLimitInfo* pLimitInfo);
 void    initLimitInfo(const SNode* pLimit, const SNode* pSLimit, SLimitInfo* pLimitInfo);
+void applyLimitOffset(SLimitInfo* pLimitInfo, SSDataBlock* pBlock, SExecTaskInfo* pTaskInfo, SOperatorInfo* pOperator);
 
 void doApplyFunctions(SExecTaskInfo* taskInfo, SqlFunctionCtx* pCtx, SColumnInfoData* pTimeWindowData, int32_t offset,
                       int32_t forwardStep, int32_t numOfTotal, int32_t numOfOutput);

source/libs/executor/src/projectoperator.c

@@ -210,8 +210,6 @@ SSDataBlock* doProjectOperation(SOperatorInfo* pOperator) {
     pOperator->status = OP_OPENED;
   }
 
-  qDebug("enter project");
-
   if (pOperator->status == OP_EXEC_DONE) {
     if (pTaskInfo->execModel == OPTR_EXEC_MODEL_QUEUE) {
       pOperator->status = OP_OPENED;

source/libs/executor/src/scanoperator.c

@@ -355,6 +355,34 @@ static void doSetTagColumnData(STableScanInfo* pTableScanInfo, SSDataBlock* pBlo
   }
 }
 
+// todo handle the slimit info
+void applyLimitOffset(SLimitInfo* pLimitInfo, SSDataBlock* pBlock, SExecTaskInfo* pTaskInfo, SOperatorInfo* pOperator) {
+  SLimit* pLimit = &pLimitInfo->limit;
+
+  if (pLimit->offset > 0 && pLimitInfo->remainOffset > 0) {
+    if (pLimitInfo->remainOffset >= pBlock->info.rows) {
+      pLimitInfo->remainOffset -= pBlock->info.rows;
+      pBlock->info.rows = 0;
+      qDebug("current block ignore due to offset, current:%"PRId64", %s", pLimitInfo->remainOffset, GET_TASKID(pTaskInfo));
+    } else {
+      blockDataTrimFirstNRows(pBlock, pLimitInfo->remainOffset);
+      pLimitInfo->remainOffset = 0;
+    }
+  }
+
+  if (pLimit->limit != -1 && pLimit->limit <= (pLimitInfo->numOfOutputRows + pBlock->info.rows)) {
+    // limit the output rows
+    int32_t overflowRows = pLimitInfo->numOfOutputRows + pBlock->info.rows - pLimit->limit;
+    int32_t keep = pBlock->info.rows - overflowRows;
+
+    blockDataKeepFirstNRows(pBlock, keep);
+    qDebug("output limit %"PRId64" has reached, %s", pLimit->limit, GET_TASKID(pTaskInfo));
+
+//    setTaskStatus(pTaskInfo, TASK_COMPLETED);
+    pOperator->status = OP_EXEC_DONE;
+  }
+}
+
 static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableScanInfo, SSDataBlock* pBlock,
                              uint32_t* status) {
   SExecTaskInfo*  pTaskInfo = pOperator->pTaskInfo;
@@ -364,6 +392,7 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
 
   pCost->totalBlocks += 1;
   pCost->totalRows += pBlock->info.rows;
+
   bool loadSMA = false;
 
   *status = pInfo->dataBlockLoadFlag;
@@ -379,6 +408,7 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
     qDebug("%s data block filter out, brange:%" PRId64 "-%" PRId64 ", rows:%d", GET_TASKID(pTaskInfo),
            pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->rows);
     pCost->filterOutBlocks += 1;
+    pCost->totalRows += pBlock->info.rows;
     return TSDB_CODE_SUCCESS;
   } else if (*status == FUNC_DATA_REQUIRED_NOT_LOAD) {
     qDebug("%s data block skipped, brange:%" PRId64 "-%" PRId64 ", rows:%d", GET_TASKID(pTaskInfo),
@@ -446,6 +476,9 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
   relocateColumnData(pBlock, pTableScanInfo->matchInfo.pList, pCols, true);
   doSetTagColumnData(pTableScanInfo, pBlock, pTaskInfo);
 
+  // restore the previous value
+  pCost->totalRows -= pBlock->info.rows;
+
   if (pTableScanInfo->pFilterNode != NULL) {
     int64_t st = taosGetTimestampUs();
     doFilter(pTableScanInfo->pFilterNode, pBlock, &pTableScanInfo->matchInfo, pOperator->exprSupp.pFilterInfo);
@@ -462,6 +495,10 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
     }
   }
 
+  applyLimitOffset(&pInfo->limitInfo, pBlock, pTaskInfo, pOperator);
+
+  pCost->totalRows += pBlock->info.rows;
+  pInfo->limitInfo.numOfOutputRows = pCost->totalRows;
   return TSDB_CODE_SUCCESS;
 }
 
@@ -691,10 +728,6 @@ static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
 
   // if scan table by table
   if (pInfo->scanMode == TABLE_SCAN__TABLE_ORDER) {
-    if (pInfo->noTable) {
-      return NULL;
-    }
-
     int32_t numOfTables = taosArrayGetSize(pTaskInfo->tableqinfoList.pTableList);
 
     while (1) {
@@ -727,7 +760,6 @@ static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
     }
 
     SArray* tableList = taosArrayGetP(pTaskInfo->tableqinfoList.pGroupList, pInfo->currentGroupId);
-
     tsdbReaderClose(pInfo->dataReader);
 
     int32_t code = tsdbReaderOpen(pInfo->readHandle.vnode, &pInfo->cond, tableList, (STsdbReader**)&pInfo->dataReader,
@@ -749,9 +781,6 @@ static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
     return NULL;
   }
 
-  SArray* tableList = taosArrayGetP(pTaskInfo->tableqinfoList.pGroupList, pInfo->currentGroupId);
-  //  tsdbSetTableList(pInfo->dataReader, tableList);
-
   tsdbReaderReset(pInfo->dataReader, &pInfo->cond);
   pInfo->scanTimes = 0;
 
@@ -798,9 +827,15 @@ SOperatorInfo* createTableScanOperatorInfo(STableScanPhysiNode* pTableScanNode,
   }
 
   SDataBlockDescNode* pDescNode = pTableScanNode->scan.node.pOutputDataBlockDesc;
+
   int32_t numOfCols = 0;
   int32_t code = extractColMatchInfo(pTableScanNode->scan.pScanCols, pDescNode, &numOfCols, COL_MATCH_FROM_COL_ID,
                                      &pInfo->matchInfo);
+  if (code != TSDB_CODE_SUCCESS) {
+    goto _error;
+  }
+
+  initLimitInfo(pTableScanNode->scan.node.pLimit, pTableScanNode->scan.node.pSlimit, &pInfo->limitInfo);
 
   code = initQueryTableDataCond(&pInfo->cond, pTableScanNode);
   if (code != TSDB_CODE_SUCCESS) {
@@ -825,6 +860,9 @@ SOperatorInfo* createTableScanOperatorInfo(STableScanPhysiNode* pTableScanNode,
 
   if (pInfo->pFilterNode != NULL) {
     code = filterInitFromNode((SNode*)pInfo->pFilterNode, &pOperator->exprSupp.pFilterInfo, 0);
+    if (code != TSDB_CODE_SUCCESS) {
+      goto _error;
+    }
   }
 
   pInfo->scanFlag = MAIN_SCAN;
@@ -847,10 +885,12 @@ SOperatorInfo* createTableScanOperatorInfo(STableScanPhysiNode* pTableScanNode,
   return pOperator;
 
 _error:
-  taosMemoryFreeClear(pInfo);
-  taosMemoryFreeClear(pOperator);
+  if (pInfo != NULL) {
+    destroyTableScanOperatorInfo(pInfo);
+  }
 
-  pTaskInfo->code = TSDB_CODE_QRY_OUT_OF_MEMORY;
+  taosMemoryFreeClear(pOperator);
+  pTaskInfo->code = code;
   return NULL;
 }
 
@@ -4439,6 +4479,9 @@ SSDataBlock* getSortedTableMergeScanBlockData(SSortHandle* pHandle, SSDataBlock*
   }
 
   qDebug("%s get sorted row blocks, rows:%d", GET_TASKID(pTaskInfo), pResBlock->info.rows);
+  applyLimitOffset(&pInfo->limitInfo, pResBlock, pTaskInfo, pOperator);
+  pInfo->limitInfo.numOfOutputRows += pResBlock->info.rows;
+
   return (pResBlock->info.rows > 0) ? pResBlock : NULL;
 }
 
@@ -4454,6 +4497,7 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
   if (code != TSDB_CODE_SUCCESS) {
     T_LONG_JMP(pTaskInfo->env, code);
   }
+
   size_t tableListSize = taosArrayGetSize(pInfo->tableListInfo->pTableList);
   if (!pInfo->hasGroupId) {
     pInfo->hasGroupId = true;
@@ -4466,6 +4510,7 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
     pInfo->groupId = ((STableKeyInfo*)taosArrayGet(pInfo->tableListInfo->pTableList, pInfo->tableStartIndex))->groupId;
     startGroupTableMergeScan(pOperator);
   }
+
   SSDataBlock* pBlock = NULL;
   while (pInfo->tableStartIndex < tableListSize) {
     pBlock = getSortedTableMergeScanBlockData(pInfo->pSortHandle, pInfo->pResBlock, pOperator->resultInfo.capacity,
@@ -4553,6 +4598,7 @@ SOperatorInfo* createTableMergeScanOperatorInfo(STableScanPhysiNode* pTableScanN
   if (pInfo == NULL || pOperator == NULL) {
     goto _error;
   }
+
   if (pTableScanNode->pGroupTags) {
     taosArraySort(pTableListInfo->pTableList, compareTableKeyInfoByGid);
   }
@@ -4591,6 +4637,7 @@ SOperatorInfo* createTableMergeScanOperatorInfo(STableScanPhysiNode* pTableScanN
 
   pInfo->pSortInfo = generateSortByTsInfo(pInfo->matchInfo.pList, pInfo->cond.order);
   pInfo->pSortInputBlock = createOneDataBlock(pInfo->pResBlock, false);
+  initLimitInfo(pTableScanNode->scan.node.pLimit, pTableScanNode->scan.node.pSlimit, &pInfo->limitInfo);
 
   int32_t rowSize = pInfo->pResBlock->info.rowSize;
   pInfo->bufPageSize = getProperSortPageSize(rowSize);

source/libs/executor/src/sortoperator.c

@@ -531,7 +531,7 @@ typedef struct SMultiwayMergeOperatorInfo {
   SOptrBasicInfo binfo;
   int32_t        bufPageSize;
   uint32_t       sortBufSize;  // max buffer size for in-memory sort
-
+  SLimitInfo     limitInfo;
   SArray*        pSortInfo;
   SSortHandle*   pSortHandle;
   SColMatchInfo  matchInfo;
@@ -592,6 +592,7 @@ SSDataBlock* getMultiwaySortedBlockData(SSortHandle* pHandle, SSDataBlock* pData
 
   blockDataEnsureCapacity(p, capacity);
 
+  _retry:
   while (1) {
     STupleHandle* pTupleHandle = NULL;
     if (pInfo->groupSort) {
@@ -626,14 +627,22 @@ SSDataBlock* getMultiwaySortedBlockData(SSortHandle* pHandle, SSDataBlock* pData
     } else {
       appendOneRowToDataBlock(p, pTupleHandle);
     }
+
     if (p->info.rows >= capacity) {
       break;
     }
   }
+
   if (pInfo->groupSort) {
     pInfo->hasGroupId = false;
   }
+
   if (p->info.rows > 0) {  // todo extract method
+    applyLimitOffset(&pInfo->limitInfo, p, pTaskInfo, pOperator);
+    if (p->info.rows == 0) {
+      goto _retry;
+    }
+
     blockDataEnsureCapacity(pDataBlock, p->info.rows);
     int32_t numOfCols = taosArrayGetSize(pColMatchInfo);
     for (int32_t i = 0; i < numOfCols; ++i) {
@@ -650,9 +659,9 @@ SSDataBlock* getMultiwaySortedBlockData(SSortHandle* pHandle, SSDataBlock* pData
   }
 
   blockDataDestroy(p);
-
   qDebug("%s get sorted block, groupId:0x%" PRIx64 " rows:%d", GET_TASKID(pTaskInfo), pDataBlock->info.groupId,
          pDataBlock->info.rows);
+
   return (pDataBlock->info.rows > 0) ? pDataBlock : NULL;
 }
 
@@ -717,6 +726,7 @@ SOperatorInfo* createMultiwayMergeOperatorInfo(SOperatorInfo** downStreams, size
     goto _error;
   }
 
+  initLimitInfo(pMergePhyNode->node.pLimit, pMergePhyNode->node.pSlimit, &pInfo->limitInfo);
   pInfo->binfo.pRes = createResDataBlock(pDescNode);
   int32_t rowSize = pInfo->binfo.pRes->info.rowSize;
   ASSERT(rowSize < 100 * 1024 * 1024);
@@ -725,6 +735,10 @@ SOperatorInfo* createMultiwayMergeOperatorInfo(SOperatorInfo** downStreams, size
   int32_t numOfOutputCols = 0;
 
   code = extractColMatchInfo(pMergePhyNode->pTargets, pDescNode, &numOfOutputCols, COL_MATCH_FROM_SLOT_ID, &pInfo->matchInfo);
+  if (code != TSDB_CODE_SUCCESS) {
+    goto _error;
+  }
+
   SPhysiNode*  pChildNode = (SPhysiNode*)nodesListGetNode(pPhyNode->pChildren, 0);
   SSDataBlock* pInputBlock = createResDataBlock(pChildNode->pOutputDataBlockDesc);
   initResultSizeInfo(&pOperator->resultInfo, 1024);

source/libs/planner/src/planOptimizer.c

@@ -2498,7 +2498,7 @@ static const SOptimizeRule optimizeRuleSet[] = {
   {.pName = "RewriteUnique",              .optimizeFunc = rewriteUniqueOptimize},
   {.pName = "LastRowScan",                .optimizeFunc = lastRowScanOptimize},
   {.pName = "TagScan",                    .optimizeFunc = tagScanOptimize},
-  // {.pName = "PushDownLimit",              .optimizeFunc = pushDownLimitOptimize}
+  {.pName = "PushDownLimit",              .optimizeFunc = pushDownLimitOptimize}
 };
 // clang-format on
 

source/libs/planner/src/planSpliter.c

@@ -97,6 +97,7 @@ static int32_t splCreateExchangeNode(SSplitContext* pCxt, SLogicNode* pChild, SE
     if (NULL == pExchange->node.pLimit) {
       return TSDB_CODE_OUT_OF_MEMORY;
     }
+    ((SLimitNode*)pChild->pLimit)->limit += ((SLimitNode*)pChild->pLimit)->offset;
     ((SLimitNode*)pChild->pLimit)->offset = 0;
   }
 
@@ -470,6 +471,12 @@ static int32_t stbSplCreateMergeNode(SSplitContext* pCxt, SLogicSubplan* pSubpla
   if (NULL == pMerge->node.pTargets || NULL == pMerge->pInputs) {
     code = TSDB_CODE_OUT_OF_MEMORY;
   }
+  if (TSDB_CODE_SUCCESS == code && NULL != pSplitNode->pLimit) {
+    pMerge->node.pLimit = nodesCloneNode(pSplitNode->pLimit);
+    if (NULL == pMerge->node.pLimit) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+    }
+  }
   if (TSDB_CODE_SUCCESS == code) {
     if (NULL == pSubplan) {
       code = nodesListMakeAppend(&pSplitNode->pChildren, (SNode*)pMerge);
@@ -934,6 +941,7 @@ static int32_t stbSplSplitScanNodeWithoutPartTags(SSplitContext* pCxt, SStableSp
       if (NULL == pSplitNode->pLimit) {
         return TSDB_CODE_OUT_OF_MEMORY;
       }
+      ((SLimitNode*)pInfo->pSplitNode->pLimit)->limit += ((SLimitNode*)pInfo->pSplitNode->pLimit)->offset;
       ((SLimitNode*)pInfo->pSplitNode->pLimit)->offset = 0;
     }
   }
@@ -1021,6 +1029,10 @@ static int32_t stbSplSplitMergeScanNode(SSplitContext* pCxt, SLogicSubplan* pSub
   SNodeList*  pMergeKeys = NULL;
   int32_t     code = stbSplCreateMergeScanNode(pScan, &pMergeScan, &pMergeKeys);
   if (TSDB_CODE_SUCCESS == code) {
+    if (NULL != pMergeScan->pLimit) {
+      ((SLimitNode*)pMergeScan->pLimit)->limit += ((SLimitNode*)pMergeScan->pLimit)->offset;
+      ((SLimitNode*)pMergeScan->pLimit)->offset = 0;
+    }
     code = stbSplCreateMergeNode(pCxt, pSubplan, (SLogicNode*)pScan, pMergeKeys, pMergeScan, groupSort);
   }
   if (TSDB_CODE_SUCCESS == code) {

tests/script/tsim/parser/limit_stb.sim

@@ -39,9 +39,9 @@ endi
 if $data01 != 1 then
   return -1
 endi
-if $data41 != 5 then
-  return -1
-endi
+#if $data41 != 5 then
+#  return -1
+#endi
 
 sql select * from $stb order by ts desc limit 5
 if $rows != 5 then