add info_schema query

Author: elianddb

enginetest/queries/information_schema_queries.go

@@ -30,6 +30,10 @@ var InfoSchemaQueries = []QueryTest{
 		Query:    "SHOW KEYS FROM `columns` FROM `information_schema`;",
 		Expected: []sql.Row{},
 	},
+	{
+		Query:    "SELECT table_schema AS TABLE_CAT, NULL AS TABLE_SCHEM, table_name, CASE WHEN table_type = 'BASE TABLE' THEN CASE WHEN table_schema = 'mysql' OR table_schema = 'performance_schema' THEN 'SYSTEM TABLE' ELSE 'TABLE' END WHEN table_type = 'TEMPORARY' THEN 'LOCAL_TEMPORARY' ELSE table_type END AS TABLE_TYPE FROM information_schema.tables; ",
+		Expected: []sql.Row{{"information_schema", nil, "administrable_role_authorizations", "SYSTEM VIEW"}},
+	},
 	{
 		Query: `SELECT 
      table_name, index_name, comment, non_unique, GROUP_CONCAT(column_name ORDER BY seq_in_index) AS COLUMNS