MDEV-29562 Spider table charset error should happen correctly.

When trying to create a spider table with banned charsets including
utf32, utf16, ucs2 and utf16le[1], spider should emit an error
immediately, rather than wait until a separate statement that
establishes a connection (e.g. SELECT). This also applies to ALTER
TABLE statement that changes charsets.

[1] https://mariadb.com/kb/en/server-system-variables/#character_set_clientSigned-off-by: Yuchen Pei <yuchen.pei@mariadb.com>
Reviewed-by: Nayuta Yanagisawa <nayuta.yanagisawa@mariadb.com>

storage/spider/ha_spider.cc

@@ -11464,6 +11464,17 @@ int ha_spider::create(
     sql_command == SQLCOM_DROP_INDEX
   )
     DBUG_RETURN(0);
+  if (!is_supported_parser_charset(info->default_table_charset))
+  {
+    String charset_option;
+    charset_option.append(STRING_WITH_LEN("CHARSET "));
+    charset_option.append(
+        STRING_WITH_LEN(info->default_table_charset->cs_name.str));
+    my_error(ER_ILLEGAL_HA_CREATE_OPTION, MYF(0), "SPIDER",
+             charset_option.c_ptr());
+    error_num= ER_ILLEGAL_HA_CREATE_OPTION;
+    goto error_charset;
+  }
   if (!(trx = spider_get_trx(thd, TRUE, &error_num)))
     goto error_get_trx;
   if (
@@ -11638,6 +11649,7 @@ int ha_spider::create(
   spider_free_share_alloc(&tmp_share);
 error_alter_before_unlock:
 error_get_trx:
+error_charset:
   DBUG_RETURN(error_num);
 }
 

storage/spider/mysql-test/spider/bugfix/r/mdev_29562.result

+#
+# MDEV-29562 Spider table with charset utf32/utf16/ucs2 tries to set client charset to unsupported value
+#
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+connection child2_1;
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+CREATE TABLE tbl_a (
+a INT
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+connection master_1;
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+CREATE TABLE tbl_a (
+a INT
+) ENGINE=Spider CHARSET utf32 COMMENT='table "tbl_a", srv "s_2_1"';
+ERROR HY000: Table storage engine 'SPIDER' does not support the create option 'CHARSET utf32'
+ALTER DATABASE auto_test_local CHARSET="ucs2";
+CREATE TABLE tbl_a (
+a INT
+) ENGINE=Spider COMMENT='table "tbl_a", srv "s_2_1"';
+ERROR HY000: Table storage engine 'SPIDER' does not support the create option 'CHARSET ucs2'
+CREATE TABLE tbl_a (
+a INT
+) ENGINE=Spider CHARSET utf8 COMMENT='table "tbl_a", srv "s_2_1"';
+SELECT * FROM tbl_a;
+a
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET utf16;
+ERROR HY000: Table storage engine 'SPIDER' does not support the create option 'CHARSET utf16'
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET utf16le;
+ERROR HY000: Table storage engine 'SPIDER' does not support the create option 'CHARSET utf16le'
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET latin1;
+connection master_1;
+DROP DATABASE IF EXISTS auto_test_local;
+connection child2_1;
+DROP DATABASE IF EXISTS auto_test_remote;
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3

storage/spider/mysql-test/spider/bugfix/t/mdev_29562.cnf

+!include include/default_mysqld.cnf
+!include ../my_1_1.cnf
+!include ../my_2_1.cnf

storage/spider/mysql-test/spider/bugfix/t/mdev_29562.test

+--echo #
+--echo # MDEV-29562 Spider table with charset utf32/utf16/ucs2 tries to set client charset to unsupported value
+--echo #
+
+--disable_query_log
+--disable_result_log
+--source ../../t/test_init.inc
+--enable_result_log
+--enable_query_log
+
+--connection child2_1
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+eval CREATE TABLE tbl_a (
+    a INT
+) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
+
+--connection master_1
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+--error ER_ILLEGAL_HA_CREATE_OPTION
+eval CREATE TABLE tbl_a (
+    a INT
+) $MASTER_1_ENGINE CHARSET utf32 COMMENT='table "tbl_a", srv "s_2_1"';
+
+ALTER DATABASE auto_test_local CHARSET="ucs2";
+--error ER_ILLEGAL_HA_CREATE_OPTION
+eval CREATE TABLE tbl_a (
+    a INT
+) $MASTER_1_ENGINE COMMENT='table "tbl_a", srv "s_2_1"';
+
+eval CREATE TABLE tbl_a (
+    a INT
+) $MASTER_1_ENGINE CHARSET utf8 COMMENT='table "tbl_a", srv "s_2_1"';
+SELECT * FROM tbl_a;
+
+--error ER_ILLEGAL_HA_CREATE_OPTION
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET utf16;
+--error ER_ILLEGAL_HA_CREATE_OPTION
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET utf16le;
+
+ALTER TABLE tbl_a CONVERT TO CHARACTER SET latin1;
+
+--connection master_1
+DROP DATABASE IF EXISTS auto_test_local;
+
+--connection child2_1
+DROP DATABASE IF EXISTS auto_test_remote;
+
+--disable_query_log
+--disable_result_log
+--source ../t/test_deinit.inc
+--enable_query_log
+--enable_result_log