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pg_stat_statements: Add more tests with temp tables and namespaces

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These tests provide coverage for RangeTblEntry and how query jumbling
works with search_path, as well as the case where relations are
re-created, generating a different query ID as the relation OID is used
in the computation.

A patch is under discussion to switch to a different approach based on
the relation name, and there was no test coverage for this area,
including how queries are currently grouped with search_path.  This is
useful to track how the situation changes between HEAD and any patches
proposed.

Christoph has proposed the test with ON COMMIT DROP temporary tables,
and I have written the second part.

Author: Christoph Berg <myon@debian.org>
Author: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/Z9iWXKGwkm8RAC93@msg.df7cb.de
This commit is contained in:
Michael Paquier
2025-03-26 07:25:23 +09:00
parent 626d7236b6
commit 3430215fe3
2 changed files with 309 additions and 0 deletions
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69
contrib/pg_stat_statements/sql/select.sql
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@ -148,3 +148,72 @@ SELECT (
SELECT COUNT(*) FROM pg_stat_statements WHERE query LIKE '%SELECT GROUPING%';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
-- Temporary table with same name, re-created.
BEGIN;
CREATE TEMP TABLE temp_t (id int) ON COMMIT DROP;
SELECT * FROM temp_t;
COMMIT;
BEGIN;
CREATE TEMP TABLE temp_t (id int) ON COMMIT DROP;
SELECT * FROM temp_t;
COMMIT;
SELECT calls, query FROM pg_stat_statements ORDER BY query COLLATE "C";
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
-- search_path with various schemas and temporary tables
CREATE SCHEMA pgss_schema_1;
CREATE SCHEMA pgss_schema_2;
-- Same attributes.
CREATE TABLE pgss_schema_1.tab_search_same (a int, b int);
CREATE TABLE pgss_schema_2.tab_search_same (a int, b int);
CREATE TEMP TABLE tab_search_same (a int, b int);
-- Different number of attributes, mapping types
CREATE TABLE pgss_schema_1.tab_search_diff_1 (a int);
CREATE TABLE pgss_schema_2.tab_search_diff_1 (a int, b int);
CREATE TEMP TABLE tab_search_diff_1 (a int, b int, c int);
-- Same number of attributes, different types
CREATE TABLE pgss_schema_1.tab_search_diff_2 (a int);
CREATE TABLE pgss_schema_2.tab_search_diff_2 (a text);
CREATE TEMP TABLE tab_search_diff_2 (a bigint);
-- First permanent schema
SET search_path = 'pgss_schema_1';
SELECT count(*) FROM tab_search_same;
SELECT a, b FROM tab_search_same;
SELECT count(*) FROM tab_search_diff_1;
SELECT count(*) FROM tab_search_diff_2;
SELECT a FROM tab_search_diff_2 AS t1;
SELECT a FROM tab_search_diff_2;
SELECT a AS a1 FROM tab_search_diff_2;
-- Second permanent schema
SET search_path = 'pgss_schema_2';
SELECT count(*) FROM tab_search_same;
SELECT a, b FROM tab_search_same;
SELECT count(*) FROM tab_search_diff_1;
SELECT count(*) FROM tab_search_diff_2;
SELECT a FROM tab_search_diff_2 AS t1;
SELECT a FROM tab_search_diff_2;
SELECT a AS a1 FROM tab_search_diff_2;
-- Temporary schema
SET search_path = 'pg_temp';
SELECT count(*) FROM tab_search_same;
SELECT a, b FROM tab_search_same;
SELECT count(*) FROM tab_search_diff_1;
SELECT count(*) FROM tab_search_diff_2;
SELECT a FROM tab_search_diff_2 AS t1;
SELECT a FROM tab_search_diff_2;
SELECT a AS a1 FROM tab_search_diff_2;
RESET search_path;
-- Schema qualifications
SELECT count(*) FROM pgss_schema_1.tab_search_same;
SELECT a, b FROM pgss_schema_1.tab_search_same;
SELECT count(*) FROM pgss_schema_2.tab_search_diff_1;
SELECT count(*) FROM pg_temp.tab_search_diff_2;
SELECT a FROM pgss_schema_2.tab_search_diff_2 AS t1;
SELECT a FROM pgss_schema_2.tab_search_diff_2;
SELECT a AS a1 FROM pgss_schema_2.tab_search_diff_2;
SELECT calls, query FROM pg_stat_statements ORDER BY query COLLATE "C";
DROP SCHEMA pgss_schema_1 CASCADE;
DROP SCHEMA pgss_schema_2 CASCADE;
DROP TABLE tab_search_same, tab_search_diff_1, tab_search_diff_2;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;