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Add CDB_TableMetadata_Text view as a proxy to access FDW tablemetadata

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This commit is contained in:
Alejandro Martínez
2016-02-11 19:16:00 +01:00
parent 2f26b44142
commit 56fed12392
4 changed files with 16 additions and 4 deletions
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4
scripts-available/CDB_ForeignTable.sql
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@@ -63,7 +63,7 @@ BEGIN
-- Bring here the remote cdb_tablemetadata
IF NOT EXISTS ( SELECT * FROM PG_CLASS WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname=fdw_name) and relname='cdb_tablemetadata') THEN
EXECUTE FORMAT ('CREATE FOREIGN TABLE %I.cdb_tablemetadata (tabname regclass, updated_at timestamp with time zone) SERVER %I OPTIONS (table_name ''cdb_tablemetadata'', schema_name ''public'', updatable ''false'')', fdw_name, fdw_name);
EXECUTE FORMAT ('CREATE FOREIGN TABLE %I.cdb_tablemetadata (tabname text, updated_at timestamp with time zone) SERVER %I OPTIONS (table_name ''cdb_tablemetadata_text'', schema_name ''public'', updatable ''false'')', fdw_name, fdw_name);
END IF;
EXECUTE FORMAT ('GRANT SELECT ON %I.cdb_tablemetadata TO %I', fdw_name, org_role);
@@ -125,7 +125,7 @@ BEGIN
-- We assume that the remote cdb_tablemetadata is called cdb_tablemetadata and is on the same schema as the queried table.
SELECT nspname FROM pg_class c, pg_namespace n WHERE c.oid=foreign_table AND c.relnamespace = n.oid INTO fdw_schema_name;
EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname::text=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
RETURN time;
END
$$