[td-255] add log.

src/client/src/tscServer.c

@@ -3008,6 +3008,8 @@ int32_t tscGetTableMetaImpl(SSqlObj* pSql, STableMetaInfo *pTableMetaInfo, bool
         return getTableMetaFromMnode(pSql, pTableMetaInfo, autocreate);
       }
     }
+
+    tscDebug("0x%"PRIx64 " %s retrieve tableMeta from cache, numOfCols:%d, numOfTags:%d", pSql->self, name, pMeta->tableInfo.numOfColumns, pMeta->tableInfo.numOfTags);
     return TSDB_CODE_SUCCESS;
   }