diff --git a/source/libs/scalar/src/filter.c b/source/libs/scalar/src/filter.c
index ee85b99ad5363a127881cd23a9486359a9e2e9cd..23047c293073299096afc3a0a596d0bfeb73f7aa 100644
--- a/source/libs/scalar/src/filter.c
+++ b/source/libs/scalar/src/filter.c
@@ -1050,6 +1050,8 @@ int32_t fltAddGroupUnitFromNode(SFilterInfo *info, SNode* tree, SArray *group) {
 
       cell = cell->pNext;
     }
+    colDataDestroy(out.columnData);
+    taosMemoryFree(out.columnData);
   } else {
     filterAddFieldFromNode(info, node->pRight, &right);
     
@@ -1813,6 +1815,8 @@ int32_t fltInitValFieldData(SFilterInfo *info) {
       }
 
       memcpy(fi->data, out.columnData->pData, out.columnData->info.bytes);
+      colDataDestroy(out.columnData);
+      taosMemoryFree(out.columnData);
     }
 
     // match/nmatch for nchar type need convert from ucs4 to mbs
@@ -3537,6 +3541,11 @@ EDealRes fltReviseRewriter(SNode** pNode, void* pContext) {
         return DEAL_RES_CONTINUE;
       }
 
+      if (OP_TYPE_JSON_CONTAINS == node->opType) {
+        stat->scalarMode = true;
+        return DEAL_RES_CONTINUE;
+      }
+
       if (QUERY_NODE_COLUMN != nodeType(node->pLeft)) {
         SNode *t = node->pLeft;
         node->pLeft = node->pRight;
diff --git a/source/libs/scalar/src/scalar.c b/source/libs/scalar/src/scalar.c
index 5f1e08dbcf6941f63119edbf2a4b838672466409..9c4d2d94dd27bee48a7740c8fb997ea37c312347 100644
--- a/source/libs/scalar/src/scalar.c
+++ b/source/libs/scalar/src/scalar.c
@@ -132,6 +132,7 @@ void sclFreeRes(SHashObj *res) {
 void sclFreeParam(SScalarParam *param) {
   if (param->columnData != NULL) {
     colDataDestroy(param->columnData);
+    taosMemoryFree(param->columnData);
   }
 
   if (param->pHashFilter != NULL) {
diff --git a/source/libs/scalar/src/sclvector.c b/source/libs/scalar/src/sclvector.c
index e6deef58240109fee9cda76fed717e25ef7ee8f6..e97831b1f6d22728ac1cc43e4d9fa9cc4f798fc6 100644
--- a/source/libs/scalar/src/sclvector.c
+++ b/source/libs/scalar/src/sclvector.c
@@ -188,17 +188,17 @@ static FORCE_INLINE void varToBool(char *buf, SScalarParam* pOut, int32_t rowInd
   colDataAppendInt8(pOut->columnData, rowIndex, (int8_t*) &v);
 }
 
-//static FORCE_INLINE void varToNchar(char* buf, SScalarParam* pOut, int32_t rowIndex) {
-//  int32_t len = 0;
-//  int32_t inputLen = varDataLen(buf);
-//
-//  char* t = taosMemoryCalloc(1,(inputLen + 1) * TSDB_NCHAR_SIZE + VARSTR_HEADER_SIZE);
-//  /*int32_t resLen = */taosMbsToUcs4(varDataVal(buf), inputLen, (TdUcs4*) varDataVal(t), pOut->columnData->info.bytes, &len);
-//  varDataSetLen(t, len);
-//
-//  colDataAppend(pOut->columnData, rowIndex, t, false);
-//  taosMemoryFree(t);
-//}
+static FORCE_INLINE void varToNchar(char* buf, SScalarParam* pOut, int32_t rowIndex) {
+  int32_t len = 0;
+  int32_t inputLen = varDataLen(buf);
+
+  char* t = taosMemoryCalloc(1,(inputLen + 1) * TSDB_NCHAR_SIZE + VARSTR_HEADER_SIZE);
+  /*int32_t resLen = */taosMbsToUcs4(varDataVal(buf), inputLen, (TdUcs4*) varDataVal(t), pOut->columnData->info.bytes, &len);
+  varDataSetLen(t, len);
+
+  colDataAppend(pOut->columnData, rowIndex, t, false);
+  taosMemoryFree(t);
+}
 
 void convertNumberToNumber(const void *inData, void *outData, int8_t inType, int8_t outType){
   switch (outType) {
@@ -275,7 +275,7 @@ int32_t vectorConvertFromVarData(const SScalarParam* pIn, SScalarParam* pOut, in
   int32_t bufSize = pIn->columnData->info.bytes;
   char *tmp = taosMemoryMalloc(bufSize + VARSTR_HEADER_SIZE);
 
-//  bool vton = false;
+  bool vton = false;
 
   _bufConverteFunc func = NULL;
   if (TSDB_DATA_TYPE_BOOL == outType) {
@@ -286,9 +286,10 @@ int32_t vectorConvertFromVarData(const SScalarParam* pIn, SScalarParam* pOut, in
     func = varToUnsigned;
   } else if (IS_FLOAT_TYPE(outType)) {
     func = varToFloat;
-//  } else if (outType == TSDB_DATA_TYPE_NCHAR) {   // can not be nchar or binary
-//    func = varToNchar;
-//    vton = true;
+  } else if (outType == TSDB_DATA_TYPE_NCHAR) {   // binary -> nchar
+    ASSERT(inType == TSDB_DATA_TYPE_VARCHAR);
+    func = varToNchar;
+    vton = true;
   } else {
     sclError("invalid convert outType:%d", outType);
     return TSDB_CODE_QRY_APP_ERROR;
@@ -316,9 +317,9 @@ int32_t vectorConvertFromVarData(const SScalarParam* pIn, SScalarParam* pOut, in
         continue;
       }
     }
-//    if (vton) {
-//      memcpy(tmp, data, varDataTLen(data));
-//    } else {
+    if (vton) {
+      memcpy(tmp, data, varDataTLen(data));
+    } else {
       if (TSDB_DATA_TYPE_VARCHAR == convertType) {
         memcpy(tmp, varDataVal(data), varDataLen(data));
         tmp[varDataLen(data)] = 0;
@@ -334,7 +335,7 @@ int32_t vectorConvertFromVarData(const SScalarParam* pIn, SScalarParam* pOut, in
 
         tmp[len] = 0;
       }
-//    }
+    }
     
     (*func)(tmp, pOut, i);
   }