add spread split partial/merge function

source/libs/function/src/builtinsimpl.c

@@ -2190,19 +2190,19 @@ int32_t apercentilePartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   int32_t bytesHist   = (int32_t)(sizeof(SAPercentileInfo) + sizeof(SHistogramInfo) + sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1));
   int32_t bytesDigest = (int32_t)(sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
   int32_t resultBytes = TMAX(bytesHist, bytesDigest);
-  char *tmp = taosMemoryCalloc(resultBytes + VARSTR_HEADER_SIZE, sizeof(char));
+  char *res = taosMemoryCalloc(resultBytes + VARSTR_HEADER_SIZE, sizeof(char));
 
   if (pInfo->algo == APERCT_ALGO_TDIGEST) {
     if (pInfo->pTDigest->size > 0) {
-      memcpy(varDataVal(tmp), pInfo, resultBytes);
-      varDataSetLen(tmp, resultBytes);
+      memcpy(varDataVal(res), pInfo, resultBytes);
+      varDataSetLen(res, resultBytes);
     } else {
       return TSDB_CODE_SUCCESS;
     }
   } else {
     if (pInfo->pHisto->numOfElems > 0) {
-      memcpy(varDataVal(tmp), pInfo, resultBytes);
-      varDataSetLen(tmp, resultBytes);
+      memcpy(varDataVal(res), pInfo, resultBytes);
+      varDataSetLen(res, resultBytes);
     } else {
       return TSDB_CODE_SUCCESS;
     }
@@ -2211,9 +2211,9 @@ int32_t apercentilePartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   int32_t          slotId = pCtx->pExpr->base.resSchema.slotId;
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
 
-  colDataAppend(pCol, pBlock->info.rows, tmp, false);
+  colDataAppend(pCol, pBlock->info.rows, res, false);
 
-  taosMemoryFree(tmp);
+  taosMemoryFree(res);
   return pResInfo->numOfRes;
 }
 
@@ -2957,6 +2957,31 @@ _spread_over:
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t spreadFunctionMerge(SqlFunctionCtx *pCtx) {
+  SInputColumnInfoData* pInput = &pCtx->input;
+  SColumnInfoData* pCol = pInput->pData[0];
+  ASSERT(pCol->info.type == TSDB_DATA_TYPE_BINARY);
+
+  SSpreadInfo* pInfo = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
+  SSpreadInfo* pInputInfo;
+
+  int32_t start = pInput->startRowIndex;
+  char* data = colDataGetData(pCol, start);
+  pInputInfo = (SSpreadInfo *)varDataVal(data);
+
+  if (pInputInfo->max > pInfo->max) {
+    pInfo->max =pInputInfo->max;
+  }
+
+  if (pInputInfo->min < pInfo->min) {
+    pInfo->min =pInputInfo->min;
+  }
+
+  SET_VAL(GET_RES_INFO(pCtx), 1, 1);
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t spreadFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SSpreadInfo* pInfo = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
   if (pInfo->hasResult == true) {
@@ -2965,6 +2990,24 @@ int32_t spreadFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   return functionFinalize(pCtx, pBlock);
 }
 
+int32_t spreadPartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+  SSpreadInfo* pInfo = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
+  int32_t resultBytes = (int32_t)sizeof(SSpreadInfo);
+  char *res = taosMemoryCalloc(resultBytes + VARSTR_HEADER_SIZE, sizeof(char));
+
+  memcpy(varDataVal(res), pInfo, resultBytes);
+  varDataSetLen(res, resultBytes);
+
+  int32_t          slotId = pCtx->pExpr->base.resSchema.slotId;
+  SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
+
+  colDataAppend(pCol, pBlock->info.rows, res, false);
+
+  taosMemoryFree(res);
+  return pResInfo->numOfRes;
+}
+
 bool getElapsedFuncEnv(SFunctionNode* UNUSED_PARAM(pFunc), SFuncExecEnv* pEnv) {
   pEnv->calcMemSize = sizeof(SElapsedInfo);
   return true;