mirror of https://github.com/citusdata/citus.git
73 lines
1.8 KiB
SQL
73 lines
1.8 KiB
SQL
-- This construct has been used as a regression test to ensure that the planner
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-- correctly distinguishes between "local" and "reference" tables, avoiding an erroneous 0-task plan.
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-- https://github.com/citusdata/citus/issues/7891
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CREATE SCHEMA issue_7891;
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SET search_path TO issue_7891;
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-- Create tables
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CREATE TABLE t2_ref (
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vkey INT,
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pkey INT,
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c15 TIMESTAMP
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);
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CREATE TABLE t4_pg (
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vkey INT,
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pkey INT,
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c22 NUMERIC,
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c23 TEXT,
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c24 TIMESTAMP
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);
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CREATE TABLE t6_pg (
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vkey INT,
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pkey INT,
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c26 TEXT
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);
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-- Mark t2_ref as a reference table
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SELECT create_reference_table('t2_ref');
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-- Insert sample data
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INSERT INTO t6_pg (vkey, pkey, c26) VALUES (2, 12000, '');
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INSERT INTO t4_pg (vkey, pkey, c22, c23, c24)
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VALUES (5, 15000, 0.0, ']]?', MAKE_TIMESTAMP(2071, 10, 26, 16, 20, 5));
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INSERT INTO t2_ref (vkey, pkey, c15)
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VALUES (14, 24000, NULL::timestamp);
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-- Show initial data
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SELECT 't6_pg before' AS label, * FROM t6_pg;
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SELECT 't4_pg data' AS label, * FROM t4_pg;
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SELECT 't2_ref data' AS label, * FROM t2_ref;
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--
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-- The problematic query: update t6_pg referencing t4_pg and sub-subquery on t2_ref.
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-- Historically might produce a 0-task plan if the planner incorrectly fails to
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-- treat t4_pg/t2_ref as local/reference.
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--
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-- The outer subquery iterates over every row in table t4_pg.
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UPDATE t6_pg
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SET vkey = 43
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WHERE EXISTS (
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SELECT (SELECT c15 FROM t2_ref)
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FROM t4_pg
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);
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-- Show final data
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SELECT 't6_pg after' AS label, * FROM t6_pg;
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-- The outer subquery iterates over rows from the reference table t2_ref
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UPDATE t6_pg
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SET vkey = 43
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WHERE EXISTS (
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SELECT (SELECT c22 FROM t4_pg)
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FROM t2_ref
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);
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-- Show final data
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SELECT 't6_pg after' AS label, * FROM t6_pg;
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SET client_min_messages TO WARNING;
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DROP SCHEMA issue_7891 CASCADE;
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