diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index c9cb161a4b6237f28fefaece20a5d4d3f9f36cf1..4156bc7649ee06ae46aee9fa0ed04075be7fb700 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -2155,7 +2155,7 @@ int tscProcessShowRsp(SSqlObj *pSql) {
   uint64_t uid = pTableMetaInfo->pTableMeta->id.uid;
   for (int16_t i = 0; i < pMetaMsg->numOfColumns; ++i, ++pSchema) {
     index.columnIndex = i;
-    tscColumnListInsert(pQueryInfo->colList, i, uid, &pSchema[i]);
+    tscColumnListInsert(pQueryInfo->colList, i, uid, pSchema);
     
     TAOS_FIELD f = tscCreateField(pSchema->type, pSchema->name, pSchema->bytes);
     SInternalField* pInfo = tscFieldInfoAppend(pFieldInfo, &f);
diff --git a/src/query/inc/qSqlparser.h b/src/query/inc/qSqlparser.h
index 1fb92008fd65b602fa7903c3c7fa9ade70037d1e..63dc7b37611daf3f79bb5dd326931c53fe8ddee9 100644
--- a/src/query/inc/qSqlparser.h
+++ b/src/query/inc/qSqlparser.h
@@ -106,11 +106,6 @@ typedef struct STableNamePair {
   SStrToken aliasName;
 } STableNamePair;
 
-//typedef struct SSubclauseInfo {  // "UNION" multiple select sub-clause
-//  SSqlNode    **pClause;
-//  int32_t       numOfClause;
-//} SSubclauseInfo;
-
 typedef struct SRelationInfo {
   int32_t       type;        // nested query|table name list
   SArray       *list;        // SArray<STableNamePair>|SArray<SSqlNode*>
@@ -253,7 +248,7 @@ SArray *tVariantListAppendToken(SArray *pList, SStrToken *pAliasToken, uint8_t s
 
 SRelationInfo *setTableNameList(SRelationInfo* pFromInfo, SStrToken *pName, SStrToken* pAlias);
 SRelationInfo *setSubquery(SRelationInfo* pFromInfo, SArray* pSqlNode);
-void      *destroyFromInfo(SRelationInfo* pFromInfo);
+void          *destroyRelationInfo(SRelationInfo* pFromInfo);
 
 // sql expr leaf node
 tSqlExpr *tSqlExprCreateIdValue(SStrToken *pToken, int32_t optrType);
diff --git a/src/query/inc/sql.y b/src/query/inc/sql.y
index b4a8ec97f8c89a46eed5f2b0eed02402cd3d0650..8ca0dee2d6e511da0f1afd2268a26d40f8923ea1 100644
--- a/src/query/inc/sql.y
+++ b/src/query/inc/sql.y
@@ -506,10 +506,12 @@ distinct(X) ::= .            { X.n = 0;}
 
 // A complete FROM clause.
 %type from {SRelationInfo*}
+%destructor from {destroyRelationInfo($$);}
 from(A) ::= FROM tablelist(X).                 {A = X;}
 from(A) ::= FROM LP union(Y) RP.               {A = setSubquery(NULL, Y);}
 
 %type tablelist {SRelationInfo*}
+%destructor tablelist {destroyRelationInfo($$);}
 tablelist(A) ::= ids(X) cpxName(Y).                     {
   X.n += Y.n;
   A = setTableNameList(NULL, &X, NULL);
diff --git a/src/query/src/qSqlParser.c b/src/query/src/qSqlParser.c
index f8f5aafbd8bc7d164c83a721354f0b61f2971ec9..0cb832f358241114f5fbf4522eed3122aa4b0333 100644
--- a/src/query/src/qSqlParser.c
+++ b/src/query/src/qSqlParser.c
@@ -552,7 +552,7 @@ SRelationInfo* setSubquery(SRelationInfo* pRelationInfo, SArray* pList) {
   return pRelationInfo;
 }
 
-void* destroyFromInfo(SRelationInfo* pRelationInfo) {
+void* destroyRelationInfo(SRelationInfo* pRelationInfo) {
   if (pRelationInfo == NULL) {
     return NULL;
   }
@@ -799,7 +799,7 @@ void destroySqlNode(SSqlNode *pSqlNode) {
   taosArrayDestroyEx(pSqlNode->pGroupby, freeVariant);
   pSqlNode->pGroupby = NULL;
 
-  pSqlNode->from = destroyFromInfo(pSqlNode->from);
+  pSqlNode->from = destroyRelationInfo(pSqlNode->from);
 
   taosArrayDestroyEx(pSqlNode->fillType, freeVariant);
   pSqlNode->fillType = NULL;
diff --git a/src/query/src/sql.c b/src/query/src/sql.c
index a4bc8602016cecd47fcec62c8b35607eda8c04e6..a283a8b916e5f453729ff575ebff2bdd28e8ad37 100644
--- a/src/query/src/sql.c
+++ b/src/query/src/sql.c
@@ -1433,6 +1433,12 @@ destroySqlNode((yypminor->yy116));
     case 261: /* exprlist */
 {
 tSqlExprListDestroy((yypminor->yy159));
+}
+      break;
+    case 238: /* from */
+    case 254: /* tablelist */
+{
+destroyRelationInfo((yypminor->yy236));
 }
       break;
     case 239: /* where_opt */