enh:[TD-32158] Free memory only when function need cleanup.

include/libs/function/function.h

@@ -258,6 +258,7 @@ typedef struct SqlFunctionCtx {
   SFuncInputRowIter    rowIter;
   bool                 bInputFinished;
   bool                 hasWindowOrGroup; // denote that the function is used with time window or group
+  bool                 needCleanup; // denote that the function need to be cleaned up
 } SqlFunctionCtx;
 
 typedef struct tExprNode {

source/libs/executor/src/aggregateoperator.c

@@ -592,8 +592,15 @@ void cleanupResultInfoInStream(SExecTaskInfo* pTaskInfo, void* pState, SExprSupp
   int32_t         numOfExprs = pSup->numOfExprs;
   int32_t*        rowEntryOffset = pSup->rowEntryInfoOffset;
   SqlFunctionCtx* pCtx = pSup->pCtx;
-
   int32_t         numOfRows = getNumOfTotalRes(pGroupResInfo);
+  bool            needCleanup = false;
+
+  for (int32_t j = 0; j < numOfExprs; ++j) {
+    needCleanup |= pCtx[j].needCleanup;
+  }
+  if (!needCleanup) {
+    return;
+  }
   
   for (int32_t i = pGroupResInfo->index; i < numOfRows; i += 1) {
     SResultWindowInfo* pWinInfo = taosArrayGet(pGroupResInfo->pRows, i);
@@ -620,6 +627,13 @@ void cleanupResultInfo(SExecTaskInfo* pTaskInfo, SExprSupp* pSup, SDiskbasedBuf*
   int32_t         numOfExprs = pSup->numOfExprs;
   int32_t*        rowEntryOffset = pSup->rowEntryInfoOffset;
   SqlFunctionCtx* pCtx = pSup->pCtx;
+  bool            needCleanup = false;
+  for (int32_t j = 0; j < numOfExprs; ++j) {
+    needCleanup |= pCtx[j].needCleanup;
+  }
+  if (!needCleanup) {
+    return;
+  }
 
   // begin from last iter
   void*   pData = pGroupResInfo->dataPos;

source/libs/executor/src/executil.c

@@ -2111,6 +2111,7 @@ SqlFunctionCtx* createSqlFunctionCtx(SExprInfo* pExprInfo, int32_t numOfOutput,
     pCtx->saveHandle.currentPage = -1;
     pCtx->pStore = pStore;
     pCtx->hasWindowOrGroup = false;
+    pCtx->needCleanup = false;
   }
 
   for (int32_t i = 1; i < numOfOutput; ++i) {

source/libs/function/src/builtinsimpl.c

@@ -2114,6 +2114,7 @@ int32_t percentileFunction(SqlFunctionCtx* pCtx) {
     SET_VAL(pResInfo, numOfElems, 1);
   }
 
+  pCtx->needCleanup = true;
   return TSDB_CODE_SUCCESS;
 }
 
@@ -6078,6 +6079,7 @@ int32_t modeFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResInfo) {
     pInfo->pHash = NULL;
     return terrno;
   }
+  pCtx->needCleanup = true;
   return TSDB_CODE_SUCCESS;
 }