[td-14493] support distinct.

include/libs/function/function.h

@@ -113,7 +113,7 @@ typedef struct SResultRowEntryInfo {
   int8_t   hasResult;       // result generated, not NULL value
   bool     initialized;     // output buffer has been initialized
   bool     complete;        // query has completed
-  uint32_t numOfRes;        // num of output result in current buffer
+  uint16_t numOfRes;        // num of output result in current buffer
 } SResultRowEntryInfo;
 
 // determine the real data need to calculated the result

source/libs/executor/src/executorimpl.c

@@ -976,7 +976,7 @@ void doApplyFunctions(SqlFunctionCtx* pCtx, STimeWindow* pWin, SColumnInfoData*
   for (int32_t k = 0; k < numOfOutput; ++k) {
     pCtx[k].startTs = pWin->skey;
 
-    // keep it temporarialy
+    // keep it temporarily
     bool    hasAgg      = pCtx[k].input.colDataAggIsSet;
     int32_t numOfRows   = pCtx[k].input.numOfRows;
     int32_t startOffset = pCtx[k].input.startRowIndex;

source/libs/executor/src/groupoperator.c

@@ -106,7 +106,7 @@ static bool groupKeyCompare(SGroupbyOperatorInfo* pInfo, SSDataBlock* pBlock, in
   return true;
 }
 
-static void keepGroupKeys(SGroupbyOperatorInfo* pInfo, SSDataBlock* pBlock, int32_t rowIndex, int32_t numOfGroupCols) {
+static void recordGroupKeys(SGroupbyOperatorInfo* pInfo, SSDataBlock* pBlock, int32_t rowIndex, int32_t numOfGroupCols) {
   SColumnDataAgg* pColAgg = NULL;
 
   for (int32_t i = 0; i < numOfGroupCols; ++i) {
@@ -197,7 +197,7 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SSDataBlock* pBlock) {
   for (int32_t j = 0; j < pBlock->info.rows; ++j) {
     // Compare with the previous row of this column, and do not set the output buffer again if they are identical.
     if (!pInfo->isInit) {
-      keepGroupKeys(pInfo, pBlock, j, numOfGroupCols);
+      recordGroupKeys(pInfo, pBlock, j, numOfGroupCols);
       pInfo->isInit = true;
       num++;
       continue;
@@ -209,6 +209,12 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SSDataBlock* pBlock) {
       continue;
     }
 
+    if (!equal && j == 0) {
+      num++;
+      recordGroupKeys(pInfo, pBlock, j, numOfGroupCols);
+      continue;
+    }
+
     /*int32_t ret = */ generatedHashKey(pInfo->keyBuf, &len, pInfo->pGroupColVals);
     int32_t ret = setGroupResultOutputBuf_rv(&(pInfo->binfo), pOperator->numOfOutput, pInfo->keyBuf, TSDB_DATA_TYPE_VARCHAR, len, 0, pInfo->aggSup.pResultBuf, pTaskInfo, &pInfo->aggSup);
     if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
@@ -220,7 +226,7 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SSDataBlock* pBlock) {
 
     // assign the group keys or user input constant values if required
     doAssignGroupKeys(pCtx, pOperator->numOfOutput, pBlock->info.rows, rowIndex);
-    keepGroupKeys(pInfo, pBlock, j, numOfGroupCols);
+    recordGroupKeys(pInfo, pBlock, j, numOfGroupCols);
     num = 1;
   }