[TD-6347]<feature>(query):restrict like to be followed only by strings

src/client/src/tscSQLParser.c

@@ -3563,7 +3563,6 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   const char* msg3 = "database name too long";
   const char* msg5 = "database name is empty";
   const char* msg6 = "pattern string is empty";
-  const char* msg7 = "pattern is invalid";
 
   /*
    * database prefix in pInfo->pMiscInfo->a[0]
@@ -3596,10 +3595,6 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     // show table/stable like 'xxxx', set the like pattern for show tables
     SStrToken* pPattern = &pShowInfo->pattern;
     if (pPattern->type != 0) {
-      if (pPattern->type == TK_ID && pPattern->z[0] == TS_BACKQUOTE_CHAR) {
-        return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg7);
-      }
-      
       pPattern->n = stringProcess(pPattern->z, pPattern->n);
 
       if (pPattern->n <= 0) {

src/query/inc/sql.y

@@ -107,7 +107,7 @@ cmd ::= SHOW dbPrefix(X) TABLES.         {
     setShowOptions(pInfo, TSDB_MGMT_TABLE_TABLE, &X, 0);
 }
 
-cmd ::= SHOW dbPrefix(X) TABLES LIKE ids(Y).         {
+cmd ::= SHOW dbPrefix(X) TABLES LIKE STRING(Y).         {
     setShowOptions(pInfo, TSDB_MGMT_TABLE_TABLE, &X, &Y);
 }
 
@@ -115,7 +115,7 @@ cmd ::= SHOW dbPrefix(X) STABLES.      {
     setShowOptions(pInfo, TSDB_MGMT_TABLE_METRIC, &X, 0);
 }
 
-cmd ::= SHOW dbPrefix(X) STABLES LIKE ids(Y).      {
+cmd ::= SHOW dbPrefix(X) STABLES LIKE STRING(Y).      {
     SStrToken token;
     tSetDbName(&token, &X);
     setShowOptions(pInfo, TSDB_MGMT_TABLE_METRIC, &token, &Y);

tests/develop-test/2-query/TD-6347.py

+###################################################################
+#           Copyright (c) 2021 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def caseDescription(self):
+        '''
+        case1:[TD-6347] restrict like to be followed only by strings
+        '''
+        return
+
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+        self._conn = conn
+
+    def run(self):
+        print("running {}".format(__file__))
+        tdSql.prepare()
+
+        tdSql.execute('create stable st_1(ts timestamp , value int ) tags (ind int)')
+        tdSql.execute('create stable st_2(ts timestamp , value int ) tags (ind int)')
+        tdSql.execute('create table  tb_1 using st_1 tags(1)')
+        tdSql.execute('create table  tb_2 using st_1 tags(2)')
+        tdSql.error('show tables like tb__')
+        tdSql.error('show stables like st__')
+        tdSql.query('show tables like "tb__"')
+        tdSql.checkRows(2)
+        tdSql.query('show stables like "st__"')
+        tdSql.checkRows(2)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())