259 lines
6.1 KiB
Plaintext
259 lines
6.1 KiB
Plaintext
--
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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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q1 | q2
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------------------+-------------------
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123 | 456
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123 | 4567890123456789
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4567890123456789 | 123
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4567890123456789 | 4567890123456789
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4567890123456789 | -4567890123456789
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(5 rows)
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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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q1 | q2
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-----+------------------
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123 | 456
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123 | 4567890123456789
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(2 rows)
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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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ERROR: relation "pcachetest" does not exist
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EXECUTE prepstmt2(123);
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ERROR: relation "pcachetest" does not exist
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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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q1 | q2
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------------------+-------------------
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4567890123456789 | -4567890123456789
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4567890123456789 | 123
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123 | 456
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123 | 4567890123456789
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4567890123456789 | 4567890123456789
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(5 rows)
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EXECUTE prepstmt2(123);
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q1 | q2
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-----+------------------
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123 | 456
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123 | 4567890123456789
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(2 rows)
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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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ERROR: cached plan must not change result type
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EXECUTE prepstmt2(123);
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ERROR: cached plan must not change result type
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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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q1 | q2
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------------------+-------------------
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4567890123456789 | -4567890123456789
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4567890123456789 | 123
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123 | 456
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123 | 4567890123456789
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4567890123456789 | 4567890123456789
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(5 rows)
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EXECUTE prepstmt2(123);
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q1 | q2
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-----+------------------
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123 | 456
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123 | 4567890123456789
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(2 rows)
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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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q1 | q2
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------------------+-------------------
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4567890123456789 | -4567890123456789
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4567890123456789 | 123
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123 | 456
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123 | 4567890123456789
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4567890123456789 | 4567890123456789
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(5 rows)
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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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q1 | q2
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------------------+-------------------
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4567890123456789 | -2283945061728394
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4567890123456789 | 61
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123 | 228
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123 | 2283945061728394
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4567890123456789 | 2283945061728394
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(5 rows)
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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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cache_test
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------------
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37
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(1 row)
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select cache_test(2);
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cache_test
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------------
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38
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(1 row)
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select cache_test(3);
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cache_test
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------------
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39
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(1 row)
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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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cache_test_2
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--------------
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4
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(1 row)
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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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cache_test_2
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--------------
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8
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(1 row)
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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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cache_test_2
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--------------
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10007
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(1 row)
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--- Check that change of search_path is ignored by replans
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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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f1
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-----
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123
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(1 row)
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set search_path = s2;
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select f1 from abc;
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f1
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-----
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456
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(1 row)
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execute p1;
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f1
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-----
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123
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(1 row)
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alter table s1.abc add column f2 float8; -- force replan
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execute p1;
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f1
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-----
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123
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(1 row)
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drop schema s1 cascade;
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NOTICE: drop cascades to table s1.abc
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drop schema s2 cascade;
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NOTICE: drop cascades to table abc
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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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nextval
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---------
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1
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(1 row)
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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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nextval
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---------
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1
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(1 row)
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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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NOTICE: table "temptable" does not exist, skipping
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CONTEXT: SQL statement "drop table if exists temptable cascade"
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PL/pgSQL function "cachebug" line 4 at SQL statement
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NOTICE: 1
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NOTICE: 2
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NOTICE: 3
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cachebug
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----------
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(1 row)
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select cachebug();
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NOTICE: drop cascades to view vv
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CONTEXT: SQL statement "drop table if exists temptable cascade"
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PL/pgSQL function "cachebug" line 4 at SQL statement
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NOTICE: 1
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NOTICE: 2
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NOTICE: 3
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cachebug
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----------
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(1 row)
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