MDEV-34421 Check the SQL command when resolving storage engine

ENGINE_SUBSTITUTION only applies to CREATE TABLE and ALTER TABLE, and
Storage_engine_name::resolve_storage_engine_with_error() could be
called when executing any sql command.

sql/handler.cc

@@ -311,7 +311,9 @@ Storage_engine_name::resolve_storage_engine_with_error(THD *thd,
   }
 
   *ha= NULL;
-  if (thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION)
+  if ((thd_sql_command(thd) != SQLCOM_CREATE_TABLE &&
+       thd_sql_command(thd) != SQLCOM_ALTER_TABLE) ||
+      thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION)
   {
     my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), m_storage_engine_name.str);
     return true;

storage/spider/mysql-test/spider/bugfix/r/mdev_34421.result

+SET sql_mode='';
+INSTALL SONAME 'ha_spider';
+CREATE TABLE t (c INT) ENGINE=Spider PARTITION BY KEY(c) (PARTITION p);
+UNINSTALL SONAME IF EXISTS 'ha_spider';
+Warnings:
+Warning	1620	Plugin is busy and will be uninstalled on shutdown
+INSERT INTO t SELECT 1;
+ERROR 42000: Unknown storage engine 'SPIDER'
+drop table t;
+Warnings:
+Warning	1620	Plugin is busy and will be uninstalled on shutdown
+Note	1305	PLUGIN SPIDER_ALLOC_MEM does not exist
+Note	1305	PLUGIN SPIDER_WRAPPER_PROTOCOLS does not exist

storage/spider/mysql-test/spider/bugfix/t/mdev_34421.test

+--source include/have_partition.inc
+SET sql_mode='';
+INSTALL SONAME 'ha_spider';
+CREATE TABLE t (c INT) ENGINE=Spider PARTITION BY KEY(c) (PARTITION p);
+UNINSTALL SONAME IF EXISTS 'ha_spider';
+--error ER_UNKNOWN_STORAGE_ENGINE
+INSERT INTO t SELECT 1;
+drop table t;
+--disable_query_log
+--source ../../include/clean_up_spider.inc