Use a left join to make sure that tables with tablespace=innodb_syste…

…m are not skipped when loading the schema (fixes vitessio#12669)

Signed-off-by: Oleksiy Kovyrin <oleksiy.kovyrin@shopify.com>

go/mysql/flavor_mysql.go

@@ -363,7 +363,7 @@ const TablesWithSize80 = `SELECT t.table_name,
  SUM(i.file_size),
  SUM(i.allocated_size)
 FROM information_schema.tables t
-INNER JOIN information_schema.innodb_tablespaces i
+LEFT JOIN information_schema.innodb_tablespaces i
  ON i.name LIKE CONCAT(database(), '/%') AND (i.name = CONCAT(t.table_schema, '/', t.table_name) OR i.name LIKE CONCAT(t.table_schema, '/', t.table_name, '#p#%'))
 WHERE t.table_schema = database()
 GROUP BY t.table_name, t.table_type, t.create_time, t.table_comment`