[td-2819] refactor codes.

src/query/src/qExecutor.c

@@ -200,6 +200,7 @@ static void getAlignQueryTimeWindow(SQueryAttr *pQueryAttr, int64_t key, int64_t
 static void setResultBufSize(SQueryAttr* pQueryAttr, SRspResultInfo* pResultInfo);
 static void setCtxTagForJoin(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, SExprInfo* pExprInfo, void* pTable);
 static void setParamForStableStddev(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, int32_t numOfOutput, SExprInfo* pExpr);
+static void setParamForStableStddevByColData(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, int32_t numOfOutput, SExprInfo* pExpr, char* val, int16_t bytes);
 static void doSetTableGroupOutputBuf(SQueryRuntimeEnv* pRuntimeEnv, SResultRowInfo* pResultRowInfo,
                                      SQLFunctionCtx* pCtx, int32_t* rowCellInfoOffset, int32_t numOfOutput,
                                      int32_t groupIndex);
@@ -1251,6 +1252,8 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
   STableQueryInfo*  item = pRuntimeEnv->current;
 
   SColumnInfoData* pColInfoData = taosArrayGet(pSDataBlock->pDataBlock, pInfo->colIndex);
+
+  SQueryAttr* pQueryAttr = pRuntimeEnv->pQueryAttr;
   int16_t     bytes = pColInfoData->info.bytes;
   int16_t     type = pColInfoData->info.type;
 
@@ -1273,6 +1276,10 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
 
       memcpy(pInfo->prevData, val, bytes);
 
+      if (pQueryAttr->stableQuery && pQueryAttr->stabledev && (pRuntimeEnv->prevResult != NULL)) {
+        setParamForStableStddevByColData(pRuntimeEnv, pInfo->binfo.pCtx, pOperator->numOfOutput, pOperator->pExpr, val, bytes);
+      }
+
       int32_t ret =
           setGroupResultOutputBuf(pRuntimeEnv, pInfo, pOperator->numOfOutput, val, type, bytes, item->groupIndex);
       if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
@@ -3319,7 +3326,7 @@ void setParamForStableStddev(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx
   int32_t numOfExprs = pQueryAttr->numOfOutput;
   for(int32_t i = 0; i < numOfExprs; ++i) {
     SExprInfo* pExprInfo1 = &(pExprInfo[i]);
-    if (pExprInfo->base.functionId != TSDB_FUNC_STDDEV_DST) {
+    if (pExprInfo1->base.functionId != TSDB_FUNC_STDDEV_DST) {
       continue;
     }
 
@@ -3347,6 +3354,36 @@ void setParamForStableStddev(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx
 
 }
 
+void setParamForStableStddevByColData(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, int32_t numOfOutput, SExprInfo* pExpr, char* val, int16_t bytes) {
+  SQueryAttr* pQuery = pRuntimeEnv->pQueryAttr;
+
+  int32_t numOfExprs = pQuery->numOfOutput;
+  for(int32_t i = 0; i < numOfExprs; ++i) {
+    SSqlExpr* pExpr1 = &pExpr[i].base;
+    if (pExpr1->functionId != TSDB_FUNC_STDDEV_DST) {
+      continue;
+    }
+
+    pCtx[i].param[0].arr = NULL;
+    pCtx[i].param[0].nType = TSDB_DATA_TYPE_INT;  // avoid freeing the memory by setting the type to be int
+
+    // TODO use hash to speedup this loop
+    int32_t numOfGroup = (int32_t)taosArrayGetSize(pRuntimeEnv->prevResult);
+    for (int32_t j = 0; j < numOfGroup; ++j) {
+      SInterResult* p = taosArrayGet(pRuntimeEnv->prevResult, j);
+      if (bytes == 0 || memcmp(p->tags, val, bytes) == 0) {
+        int32_t numOfCols = (int32_t)taosArrayGetSize(p->pResult);
+        for (int32_t k = 0; k < numOfCols; ++k) {
+          SStddevInterResult* pres = taosArrayGet(p->pResult, k);
+          if (pres->colId == pExpr1->colInfo.colId) {
+            pCtx[i].param[0].arr = pres->pResult;
+            break;
+          }
+        }
+      }
+    }
+  }
+}
 /*
  * There are two cases to handle:
  *
@@ -3476,9 +3513,9 @@ static void toSSDataBlock(SGroupResInfo *pGroupResInfo, SQueryRuntimeEnv* pRunti
   }
 }
 
-static void updateNumOfRowsInResultRows(SQueryRuntimeEnv *pRuntimeEnv,
-    SQLFunctionCtx* pCtx, int32_t numOfOutput, SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset) {
-  SQueryAttr *pQueryAttr = pRuntimeEnv->pQueryAttr;
+static void updateNumOfRowsInResultRows(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, int32_t numOfOutput,
+                                        SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset) {
+  SQueryAttr* pQueryAttr = pRuntimeEnv->pQueryAttr;
 
   // update the number of result for each, only update the number of rows for the corresponding window result.
   if (QUERY_IS_INTERVAL_QUERY(pQueryAttr)) {