[TD-15] fix error while create child table

src/mnode/src/mgmtChildTable.c

@@ -319,9 +319,8 @@ void* mgmtCreateChildTable(SCMCreateTableMsg *pCreate, SVgObj *pVgroup, int32_t
   desc.type = SDB_OPER_TYPE_GLOBAL;
   desc.pObj = pTable;
   desc.table = tsChildTableSdb;
-  sdbInsertRow(&desc);
-
-  if (sdbInsertRow(&desc) < 0) {
+  
+  if (sdbInsertRow(&desc) != TSDB_CODE_SUCCESS) {
     free(pTable);
     mError("ctable:%s, update sdb error", pCreate->tableId);
     terrno = TSDB_CODE_SDB_ERROR;

src/mnode/src/mgmtNormalTable.c

@@ -334,7 +334,7 @@ void *mgmtCreateNormalTable(SCMCreateTableMsg *pCreate, SVgObj *pVgroup, int32_t
   desc.type = SDB_OPER_TYPE_GLOBAL;
   desc.pObj = pTable;
   desc.table = tsNormalTableSdb;
-  if (sdbInsertRow(&desc) < 0) {
+  if (sdbInsertRow(&desc) != TSDB_CODE_SUCCESS) {
     mError("table:%s, update sdb error", pTable->tableId);
     free(pTable);
     terrno = TSDB_CODE_SDB_ERROR;

src/mnode/src/mgmtTable.c

@@ -287,6 +287,7 @@ int32_t mgmtRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows, void *
       createdTime  = pNormalTable->createdTime;
       numOfColumns = pNormalTable->numOfColumns;
     } else {
+      pShow->pNode = NULL;
       void *pChildTableNode = sdbFetchRow(tsChildTableSdb, pShow->pNode, (void **) &pTable);
       if (pTable != NULL) {
         SChildTableObj *pChildTable = (SChildTableObj *) pTable;