[td-225]fix memory leak.

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);

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);

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);

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;

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 */