diff --git a/source/libs/planner/src/planOptimizer.c b/source/libs/planner/src/planOptimizer.c
index 120a853741..b47f0bc043 100644
--- a/source/libs/planner/src/planOptimizer.c
+++ b/source/libs/planner/src/planOptimizer.c
@@ -1334,11 +1334,12 @@ static int32_t smaIndexOptApplyIndex(SLogicSubplan* pLogicSubplan, SScanLogicNod
   if (TSDB_CODE_SUCCESS == code) {
     code = replaceLogicNode(pLogicSubplan, pScan->node.pParent, pSmaScan);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    nodesDestroyNode((SNode*)pScan->node.pParent);
+  }
   return code;
 }
 
-static void smaIndexOptDestroySmaIndex(void* p) { taosMemoryFree(((STableIndexInfo*)p)->expr); }
-
 static int32_t smaIndexOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SScanLogicNode* pScan) {
   int32_t code = TSDB_CODE_SUCCESS;
   int32_t nindexes = taosArrayGetSize(pScan->pSmaIndexes);
@@ -1348,8 +1349,6 @@ static int32_t smaIndexOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogi
     code = smaIndexOptCouldApplyIndex(pScan, pIndex, &pSmaCols);
     if (TSDB_CODE_SUCCESS == code && NULL != pSmaCols) {
       code = smaIndexOptApplyIndex(pLogicSubplan, pScan, pIndex, pSmaCols);
-      taosArrayDestroyEx(pScan->pSmaIndexes, smaIndexOptDestroySmaIndex);
-      pScan->pSmaIndexes = NULL;
       pCxt->optimized = true;
       break;
     }