exec-ddl
CREATE TABLE system.information_schema.schemata (
	CATALOG_NAME               STRING NOT NULL,
	SCHEMA_NAME                STRING NOT NULL,
	DEFAULT_CHARACTER_SET_NAME STRING,
	SQL_PATH                   STRING
)
----
TABLE schemata
 ├── catalog_name string not null
 ├── schema_name string not null
 ├── default_character_set_name string
 └── sql_path string

opt
SELECT * FROM system.information_schema.schemata WHERE SCHEMA_NAME='public'
----
select
 ├── columns: catalog_name:1(string) schema_name:2(string!null) default_character_set_name:3(string) sql_path:4(string)
 ├── stats: [rows=10, distinct(2)=1]
 ├── cost: 20
 ├── fd: ()-->(2)
 ├── virtual-scan system.information_schema.schemata
 │    ├── columns: catalog_name:1(string) schema_name:2(string) default_character_set_name:3(string) sql_path:4(string)
 │    ├── stats: [rows=1000, distinct(2)=100]
 │    └── cost: 10
 └── filters [type=bool, outer=(2), constraints=(/2: [/'public' - /'public']; tight), fd=()-->(2)]
      └── schema_name = 'public' [type=bool, outer=(2), constraints=(/2: [/'public' - /'public']; tight)]
