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https://github.com/timescale/timescaledb.git
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72588a2382
Primary and unqiue constraints are limited to segment_by and order_by columns and foreign key constraints are limited to segment_by columns when creating a compressed hypertable. There are no restrictions on check constraints.
39 lines
1.3 KiB
PL/PgSQL
39 lines
1.3 KiB
PL/PgSQL
-- 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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-- Clone fk constraint from a hypertable
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CREATE OR REPLACE FUNCTION _timescaledb_internal.hypertable_constraint_add_table_fk_constraint(
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user_ht_constraint_name NAME,
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user_ht_schema_name NAME,
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user_ht_table_name NAME,
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compress_ht_id INTEGER
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)
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RETURNS VOID LANGUAGE PLPGSQL AS
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$BODY$
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DECLARE
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compressed_ht_row _timescaledb_catalog.hypertable;
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constraint_oid OID;
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check_sql TEXT;
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def TEXT;
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BEGIN
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SELECT * INTO STRICT compressed_ht_row FROM _timescaledb_catalog.hypertable h
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WHERE h.id = compress_ht_id;
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IF user_ht_constraint_name IS NOT NULL THEN
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SELECT oid INTO STRICT constraint_oid FROM pg_constraint
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WHERE conname=user_ht_constraint_name AND contype = 'f' AND
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conrelid = format('%I.%I', user_ht_schema_name, user_ht_table_name)::regclass::oid;
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def := pg_get_constraintdef(constraint_oid);
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ELSE
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RAISE 'unknown constraint type';
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END IF;
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IF def IS NOT NULL THEN
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EXECUTE format(
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$$ ALTER TABLE %I.%I ADD CONSTRAINT %I %s $$,
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compressed_ht_row.schema_name, compressed_ht_row.table_name, user_ht_constraint_name, def
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);
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END IF;
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END
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$BODY$;
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