chore: import upstream snapshot with attribution
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wehub-resource-sync
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--
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-- Tests to exercise the plan caching/invalidation mechanism
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--
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CREATE TEMP TABLE pcachetest AS SELECT * FROM int8_tbl;
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-- create and use a cached plan
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PREPARE prepstmt AS SELECT * FROM pcachetest;
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EXECUTE prepstmt;
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-- and one with parameters
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PREPARE prepstmt2(bigint) AS SELECT * FROM pcachetest WHERE q1 = $1;
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EXECUTE prepstmt2(123);
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-- invalidate the plans and see what happens
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DROP TABLE pcachetest;
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EXECUTE prepstmt;
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EXECUTE prepstmt2(123);
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-- recreate the temp table (this demonstrates that the raw plan is
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-- purely textual and doesn't depend on OIDs, for instance)
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CREATE TEMP TABLE pcachetest AS SELECT * FROM int8_tbl ORDER BY 2;
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EXECUTE prepstmt;
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EXECUTE prepstmt2(123);
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-- prepared statements should prevent change in output tupdesc,
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-- since clients probably aren't expecting that to change on the fly
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ALTER TABLE pcachetest ADD COLUMN q3 bigint;
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EXECUTE prepstmt;
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EXECUTE prepstmt2(123);
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-- but we're nice guys and will let you undo your mistake
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ALTER TABLE pcachetest DROP COLUMN q3;
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EXECUTE prepstmt;
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EXECUTE prepstmt2(123);
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-- Try it with a view, which isn't directly used in the resulting plan
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-- but should trigger invalidation anyway
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CREATE TEMP VIEW pcacheview AS
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SELECT * FROM pcachetest;
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PREPARE vprep AS SELECT * FROM pcacheview;
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EXECUTE vprep;
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CREATE OR REPLACE TEMP VIEW pcacheview AS
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SELECT q1, q2/2 AS q2 FROM pcachetest;
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EXECUTE vprep;
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-- Check basic SPI plan invalidation
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create function cache_test(int) returns int as $$
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declare total int;
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begin
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create temp table t1(f1 int);
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insert into t1 values($1);
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insert into t1 values(11);
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insert into t1 values(12);
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insert into t1 values(13);
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select sum(f1) into total from t1;
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drop table t1;
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return total;
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end
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$$ language plpgsql;
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select cache_test(1);
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select cache_test(2);
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select cache_test(3);
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-- Check invalidation of plpgsql "simple expression"
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create temp view v1 as
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select 2+2 as f1;
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create function cache_test_2() returns int as $$
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begin
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return f1 from v1;
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end$$ language plpgsql;
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select cache_test_2();
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create or replace temp view v1 as
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select 2+2+4 as f1;
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select cache_test_2();
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create or replace temp view v1 as
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select 2+2+4+(select max(unique1) from tenk1) as f1;
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select cache_test_2();
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--- Check that change of search_path is honored when re-using cached plan
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create schema s1
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create table abc (f1 int);
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create schema s2
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create table abc (f1 int);
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insert into s1.abc values(123);
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insert into s2.abc values(456);
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set search_path = s1;
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prepare p1 as select f1 from abc;
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execute p1;
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set search_path = s2;
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select f1 from abc;
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execute p1;
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alter table s1.abc add column f2 float8; -- force replan
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execute p1;
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drop schema s1 cascade;
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drop schema s2 cascade;
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reset search_path;
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-- Check that invalidation deals with regclass constants
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create temp sequence seq;
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prepare p2 as select nextval('seq');
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execute p2;
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drop sequence seq;
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create temp sequence seq;
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execute p2;
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-- Check DDL via SPI, immediately followed by SPI plan re-use
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-- (bug in original coding)
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create function cachebug() returns void as $$
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declare r int;
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begin
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drop table if exists temptable cascade;
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create temp table temptable as select * from generate_series(1,3) as f1;
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create temp view vv as select * from temptable;
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for r in select * from vv loop
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raise notice '%', r;
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end loop;
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end$$ language plpgsql;
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select cachebug();
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select cachebug();
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-- Check that addition or removal of any partition is correctly dealt with by
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-- default partition table when it is being used in prepared statement.
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create table pc_list_parted (a int) partition by list(a);
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create table pc_list_part_null partition of pc_list_parted for values in (null);
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create table pc_list_part_1 partition of pc_list_parted for values in (1);
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create table pc_list_part_def partition of pc_list_parted default;
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prepare pstmt_def_insert (int) as insert into pc_list_part_def values($1);
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-- should fail
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execute pstmt_def_insert(null);
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execute pstmt_def_insert(1);
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create table pc_list_part_2 partition of pc_list_parted for values in (2);
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execute pstmt_def_insert(2);
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alter table pc_list_parted detach partition pc_list_part_null;
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-- should be ok
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execute pstmt_def_insert(null);
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drop table pc_list_part_1;
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-- should be ok
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execute pstmt_def_insert(1);
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drop table pc_list_parted, pc_list_part_null;
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deallocate pstmt_def_insert;
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-- Test plan_cache_mode
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create table test_mode (a int);
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insert into test_mode select 1 from generate_series(1,1000) union all select 2;
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create index on test_mode (a);
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analyze test_mode;
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prepare test_mode_pp (int) as select count(*) from test_mode where a = $1;
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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-- up to 5 executions, custom plan is used
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set plan_cache_mode to auto;
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explain (costs off) execute test_mode_pp(2);
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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-- force generic plan
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set plan_cache_mode to force_generic_plan;
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explain (costs off) execute test_mode_pp(2);
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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-- get to generic plan by 5 executions
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set plan_cache_mode to auto;
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execute test_mode_pp(1); -- 1x
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execute test_mode_pp(1); -- 2x
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execute test_mode_pp(1); -- 3x
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execute test_mode_pp(1); -- 4x
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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execute test_mode_pp(1); -- 5x
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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-- we should now get a really bad plan
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explain (costs off) execute test_mode_pp(2);
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-- but we can force a custom plan
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set plan_cache_mode to force_custom_plan;
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explain (costs off) execute test_mode_pp(2);
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select name, generic_plans, custom_plans from pg_prepared_statements
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where name = 'test_mode_pp';
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drop table test_mode;
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