The pg_extension system catalogs provides information about CockroachDB extensions.
Data exposed by pg_extension
In CockroachDB v21.1, pg_extension contains the following tables, all of which provide information about CockroachDB's spatial extension:
geography_columnsgeometry_columnsspatial_ref_sys
pg_extension tables are read-only.
To see the list of tables in pg_extension for the current database, use the following SHOW TABLES statement:
> SHOW TABLES FROM pg_extension;
schema_name | table_name | type | owner | estimated_row_count
---------------+-------------------+-------+-------+----------------------
pg_extension | geography_columns | table | NULL | NULL
pg_extension | geometry_columns | table | NULL | NULL
pg_extension | spatial_ref_sys | table | NULL | NULL
(3 rows)
Querying pg_extension tables
You can run SELECT queries on the tables in pg_extension.
To ensure that you can view all of the tables in pg_extension, query the tables as a user with admin privileges.
Unless specified otherwise, queries to pg_extension assume the current database.
For example, to return the pg_extension table with additional information about indexes in the movr database, you can query the pg_extension.pg_indexes table:
> SELECT * FROM movr.pg_extension.pg_indexes;
crdb_oid | schemaname | tablename | indexname | tablespace | indexdef
-------------+------------+----------------------------+-----------------------------------------------+------------+---------------------------------------------------------------------------------------------------------------------------------
2055313241 | public | users | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.users USING btree (city ASC, id ASC)
1795576970 | public | vehicles | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.vehicles USING btree (city ASC, id ASC)
1795576969 | public | vehicles | vehicles_auto_index_fk_city_ref_users | NULL | CREATE INDEX vehicles_auto_index_fk_city_ref_users ON movr.public.vehicles USING btree (city ASC, owner_id ASC)
450499963 | public | rides | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.rides USING btree (city ASC, id ASC)
450499960 | public | rides | rides_auto_index_fk_city_ref_users | NULL | CREATE INDEX rides_auto_index_fk_city_ref_users ON movr.public.rides USING btree (city ASC, rider_id ASC)
450499961 | public | rides | rides_auto_index_fk_vehicle_city_ref_vehicles | NULL | CREATE INDEX rides_auto_index_fk_vehicle_city_ref_vehicles ON movr.public.rides USING btree (vehicle_city ASC, vehicle_id ASC)
2315049508 | public | vehicle_location_histories | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.vehicle_location_histories USING btree (city ASC, ride_id ASC, "timestamp" ASC)
969972501 | public | promo_codes | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.promo_codes USING btree (code ASC)
710236230 | public | user_promo_codes | primary | NULL | CREATE UNIQUE INDEX "primary" ON movr.public.user_promo_codes USING btree (city ASC, user_id ASC, code ASC)
(9 rows)
See also
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