MDEV-30765 SHOW TABLES not working properly with lower_case_table_names=2

lower_case_table_names=2 means "table names and database names are
stored as declared, but they are compared in lowercase".
But names of objects in grants are stored in lowercase for any value
of lower_case_table_names. This caused an error when checking grants
for objects containing uppercase letters since table_hash_search()
didn't take into account lower_case_table_names value

mysql-test/main/lowercase_table2.opt

+--lower-case-table-names=2

mysql-test/main/lowercase_table2.result

@@ -14,7 +14,7 @@ SHOW CREATE TABLE T1;
 Table	Create Table
 T1	CREATE TABLE `T1` (
   `a` int(11) DEFAULT NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 RENAME TABLE T1 TO T2;
 SHOW TABLES LIKE "T2";
 Tables_in_test (T2)
@@ -70,7 +70,7 @@ SHOW CREATE TABLE T1;
 Table	Create Table
 T1	CREATE TABLE `T1` (
   `a` int(11) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=latin1
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 RENAME TABLE T1 TO T2;
 SHOW TABLES LIKE "T2";
 Tables_in_test (T2)
@@ -319,18 +319,42 @@ Database (mysql_t%)
 mysql_TEST
 show create database mysql_test;
 Database	Create Database
-mysql_test	CREATE DATABASE `mysql_test` /*!40100 DEFAULT CHARACTER SET latin1 */
+mysql_test	CREATE DATABASE `mysql_test` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
 show create database mysql_TEST;
 Database	Create Database
-mysql_TEST	CREATE DATABASE `mysql_TEST` /*!40100 DEFAULT CHARACTER SET latin1 */
+mysql_TEST	CREATE DATABASE `mysql_TEST` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
 show create table mysql_TEST.T1;
 Table	Create Table
 T1	CREATE TABLE `T1` (
   `a` int(11) DEFAULT NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 show create table mysql_test.t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) DEFAULT NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 drop database mysql_TEST;
+# MDEV-30765 SHOW TABLES not working properly with
+# lower_case_table_names=2
+#
+create database db1;
+use db1;
+# lowercase table name
+create table `a` (a int);
+# uppercase table name
+create table `B` (a int);
+create user 'mysqltest_1'@'localhost' identified by 'password';
+grant select, show view on db1.`a` to 'mysqltest_1'@'localhost';
+grant select, show view on db1.`B` to 'mysqltest_1'@'localhost';
+connect  conn1, localhost, mysqltest_1, password, test;
+connection conn1;
+use db1;
+show tables;
+Tables_in_db1
+B
+a
+connection default;
+disconnect conn1;
+drop user 'mysqltest_1'@'localhost';
+drop tables a, B;
+drop database db1;

mysql-test/main/lowercase_table2.test

@@ -288,3 +288,29 @@ show create database mysql_TEST;
 show create table mysql_TEST.T1;
 show create table mysql_test.t1;
 drop database mysql_TEST;
+
+--echo # MDEV-30765 SHOW TABLES not working properly with
+--echo # lower_case_table_names=2
+--echo #
+create database db1;
+use db1;
+--echo # lowercase table name
+create table `a` (a int);
+--echo # uppercase table name
+create table `B` (a int);
+
+create user 'mysqltest_1'@'localhost' identified by 'password';
+
+grant select, show view on db1.`a` to 'mysqltest_1'@'localhost';
+grant select, show view on db1.`B` to 'mysqltest_1'@'localhost';
+
+connect (conn1, localhost, mysqltest_1, password, test);
+connection conn1;
+use db1;
+show tables;
+
+connection default;
+disconnect conn1;
+drop user 'mysqltest_1'@'localhost';
+drop tables a, B;
+drop database db1;
\ No newline at end of file

sql/sql_acl.cc

@@ -5462,7 +5462,7 @@ table_hash_search(const char *host, const char *ip, const char *db,
 		  const char *user, const char *tname, bool exact)
 {
   return (GRANT_TABLE*) name_hash_search(&column_priv_hash, host, ip, db,
-					 user, tname, exact, FALSE);
+					 user, tname, exact, (lower_case_table_names > 0));
 }
 
 static bool column_priv_insert(GRANT_TABLE *grant)