fix memory leak

source/libs/executor/inc/tfill.h

@@ -30,6 +30,7 @@ extern "C" {
 struct SSDataBlock;
 
 typedef struct SFillColInfo {
+  int32_t    numOfFillExpr;
   SExprInfo* pExpr;
   bool       notFillCol;  // denote if this column needs fill operation
   SVariant   fillVal;

source/libs/executor/src/tfill.c

@@ -635,6 +635,7 @@ SFillColInfo* createFillColInfo(SExprInfo* pExpr, int32_t numOfFillExpr, SExprIn
       nodesValueNodeToVariant(pv, &pFillCol[i].fillVal);
     }
   }
+  pFillCol->numOfFillExpr = numOfFillExpr;
 
   for (int32_t i = 0; i < numOfNoFillExpr; ++i) {
     SExprInfo* pExprInfo = &pNotFillExpr[i];

source/libs/executor/src/timesliceoperator.c

@@ -661,6 +661,9 @@ void destroyTimeSliceOperatorInfo(void* param) {
   taosArrayDestroy(pInfo->pLinearInfo);
   cleanupExprSupp(&pInfo->scalarSup);
 
+  for (int32_t i = 0; i < pInfo->pFillColInfo->numOfFillExpr; ++i) {
+    taosVariantDestroy(&pInfo->pFillColInfo[i].fillVal);
+  }
   taosMemoryFree(pInfo->pFillColInfo);
   taosMemoryFreeClear(param);
 }