Fixed that SHOW CREATE TABLE for sequences shows used table options

mysql-test/suite/sql_sequence/create.result

@@ -724,3 +724,34 @@ ERROR HY000: Sequence 'test.s' table structure is invalid (Wrong number of colum
 #
 # End of 10.4 test
 #
+#
+# Ensure that SHOW CREATE TABLE shows used table options
+#
+SET @@innodb_compression_default=ON;
+CREATE TABLE seq (
+`next_not_cached_value` bigint(21) NOT NULL,
+`minimum_value` bigint(21) NOT NULL,
+`maximum_value` bigint(21) NOT NULL,
+`start_value` bigint(21) NOT NULL,
+`increment` bigint(21) NOT NULL,
+`cache_size` bigint(21) unsigned NOT NULL,
+`cycle_option` tinyint(1) unsigned NOT NULL,
+`cycle_count` bigint(21) NOT NULL
+) engine=innodb,sequence=1;
+show create sequence seq;
+Table	Create Table
+seq	CREATE SEQUENCE `seq` start with 1 minvalue 1 maxvalue 9223372036854775806 increment by 1 cache 1000 nocycle ENGINE=InnoDB `PAGE_COMPRESSED`='ON'
+show create table seq;
+Table	Create Table
+seq	CREATE TABLE `seq` (
+  `next_not_cached_value` bigint(21) NOT NULL,
+  `minimum_value` bigint(21) NOT NULL,
+  `maximum_value` bigint(21) NOT NULL,
+  `start_value` bigint(21) NOT NULL,
+  `increment` bigint(21) NOT NULL,
+  `cache_size` bigint(21) unsigned NOT NULL,
+  `cycle_option` tinyint(1) unsigned NOT NULL,
+  `cycle_count` bigint(21) NOT NULL
+) ENGINE=InnoDB SEQUENCE=1 `PAGE_COMPRESSED`='ON'
+drop sequence seq;
+SET @@innodb_compression_default=DEFAULT;

mysql-test/suite/sql_sequence/create.test

@@ -565,3 +565,23 @@ create table s sequence=1 as select 1;
 --echo #
 --echo # End of 10.4 test
 --echo #
+
+--echo #
+--echo # Ensure that SHOW CREATE TABLE shows used table options
+--echo #
+
+SET @@innodb_compression_default=ON;
+CREATE TABLE seq (
+  `next_not_cached_value` bigint(21) NOT NULL,
+  `minimum_value` bigint(21) NOT NULL,
+  `maximum_value` bigint(21) NOT NULL,
+  `start_value` bigint(21) NOT NULL,
+  `increment` bigint(21) NOT NULL,
+  `cache_size` bigint(21) unsigned NOT NULL,
+  `cycle_option` tinyint(1) unsigned NOT NULL,
+  `cycle_count` bigint(21) NOT NULL
+) engine=innodb,sequence=1;
+show create sequence seq;
+show create table seq;
+drop sequence seq;
+SET @@innodb_compression_default=DEFAULT;

sql/ha_sequence.h

@@ -65,6 +65,8 @@ public:
 
   ha_sequence(handlerton *hton, TABLE_SHARE *share);
   ~ha_sequence();
+  virtual handlerton *storage_ht() const override
+  { return file->ht; }
 
   /* virtual function that are re-implemented for sequence */
   int open(const char *name, int mode, uint test_if_locked) override;

sql/handler.h

@@ -4987,6 +4987,12 @@ public:
   /* XXX to be removed, see ha_partition::partition_ht() */
   virtual handlerton *partition_ht() const
   { return ht; }
+  /*
+    Used with 'wrapper' engines, like SEQUENCE, to access to the
+    underlaying engine used for storage.
+  */
+  virtual handlerton *storage_ht() const
+  { return ht; }
   inline int ha_write_tmp_row(uchar *buf);
   inline int ha_delete_tmp_row(uchar *buf);
   inline int ha_update_tmp_row(const uchar * old_data, uchar * new_data);

sql/sql_show.cc

@@ -1838,7 +1838,7 @@ static void add_table_options(THD *thd, TABLE *table,
     hton= table->part_info->default_engine_type;
   else
 #endif
-    hton= table->file->ht;
+    hton= table->file->storage_ht();
 
   bzero((char*) &create_info, sizeof(create_info));
   /* Allow update_create_info to update row type, page checksums and options */