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Postgres will prepend pg_temp to the effective search_path if it is not present in the search_path. While pg_temp will never be used to look up functions or operators unless explicitly requested pg_temp will be used to look up relations. Putting pg_temp in search_path makes sure objects in pg_temp will be considered last and pg_temp cannot be used to mask existing objects.
59 lines
2.1 KiB
SQL
59 lines
2.1 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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-- This file contains functions related to getting information about the
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-- schema of a hypertable, including columns, their types, etc.
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-- Check if a given table OID is a main table (i.e. the table a user
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-- targets for SQL operations) for a hypertable
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CREATE OR REPLACE FUNCTION _timescaledb_internal.is_main_table(
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table_oid regclass
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)
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RETURNS bool LANGUAGE SQL STABLE AS
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$BODY$
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SELECT EXISTS(SELECT 1 FROM _timescaledb_catalog.hypertable WHERE table_name = relname AND schema_name = nspname)
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FROM pg_class c
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INNER JOIN pg_namespace n ON (n.OID = c.relnamespace)
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WHERE c.OID = table_oid;
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$BODY$ SET search_path TO pg_catalog, pg_temp;
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-- Check if given table is a hypertable's main table
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CREATE OR REPLACE FUNCTION _timescaledb_internal.is_main_table(
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schema_name NAME,
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table_name NAME
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)
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RETURNS BOOLEAN LANGUAGE SQL STABLE AS
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$BODY$
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SELECT EXISTS(
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SELECT 1 FROM _timescaledb_catalog.hypertable h
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WHERE h.schema_name = is_main_table.schema_name AND
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h.table_name = is_main_table.table_name
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);
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$BODY$ SET search_path TO pg_catalog, pg_temp;
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-- Get a hypertable given its main table OID
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CREATE OR REPLACE FUNCTION _timescaledb_internal.hypertable_from_main_table(
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table_oid regclass
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)
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RETURNS _timescaledb_catalog.hypertable LANGUAGE SQL STABLE AS
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$BODY$
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SELECT h.*
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FROM pg_class c
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INNER JOIN pg_namespace n ON (n.OID = c.relnamespace)
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INNER JOIN _timescaledb_catalog.hypertable h ON (h.table_name = c.relname AND h.schema_name = n.nspname)
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WHERE c.OID = table_oid;
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$BODY$ SET search_path TO pg_catalog, pg_temp;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.main_table_from_hypertable(
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hypertable_id int
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)
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RETURNS regclass LANGUAGE SQL STABLE AS
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$BODY$
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SELECT format('%I.%I',h.schema_name, h.table_name)::regclass
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FROM _timescaledb_catalog.hypertable h
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WHERE id = hypertable_id;
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$BODY$ SET search_path TO pg_catalog, pg_temp;
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