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4886dc92e0
by the planning process. This prevents the "failed to locate grouping columns" error recently reported by Dickson Guedes. That happens because planning replaces SubLinks by SubPlans in the subquery's targetlist, and exprTypmod() is smarter about the former than the latter, causing the apparent type of the subquery's output columns to change. This seems to be a deficiency we should fix in exprTypmod(), but that will be a much more invasive patch with possible side-effects elsewhere, so I'll do that only in HEAD. Back-patch to 8.3. Arguably the lack of a copying step is broken/dangerous all the way back, but in the absence of known problems I'll refrain from making the older branches pay the extra cost. (The reason this particular symptom didn't appear before is that exprTypmod() wasn't smart about SubLinks either, until 8.3.)
312 lines
8.5 KiB
SQL
312 lines
8.5 KiB
SQL
--
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-- SUBSELECT
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--
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SELECT 1 AS one WHERE 1 IN (SELECT 1);
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SELECT 1 AS zero WHERE 1 NOT IN (SELECT 1);
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SELECT 1 AS zero WHERE 1 IN (SELECT 2);
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-- Set up some simple test tables
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CREATE TABLE SUBSELECT_TBL (
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f1 integer,
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f2 integer,
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f3 float
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);
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INSERT INTO SUBSELECT_TBL VALUES (1, 2, 3);
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INSERT INTO SUBSELECT_TBL VALUES (2, 3, 4);
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INSERT INTO SUBSELECT_TBL VALUES (3, 4, 5);
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INSERT INTO SUBSELECT_TBL VALUES (1, 1, 1);
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INSERT INTO SUBSELECT_TBL VALUES (2, 2, 2);
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INSERT INTO SUBSELECT_TBL VALUES (3, 3, 3);
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INSERT INTO SUBSELECT_TBL VALUES (6, 7, 8);
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INSERT INTO SUBSELECT_TBL VALUES (8, 9, NULL);
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SELECT '' AS eight, * FROM SUBSELECT_TBL;
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-- Uncorrelated subselects
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SELECT '' AS two, f1 AS "Constant Select" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT 1);
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SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL);
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SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE
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f2 IN (SELECT f1 FROM SUBSELECT_TBL));
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SELECT '' AS three, f1, f2
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FROM SUBSELECT_TBL
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WHERE (f1, f2) NOT IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
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WHERE f3 IS NOT NULL);
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-- Correlated subselects
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SELECT '' AS six, f1 AS "Correlated Field", f2 AS "Second Field"
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FROM SUBSELECT_TBL upper
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE f1 = upper.f1);
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SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
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FROM SUBSELECT_TBL upper
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WHERE f1 IN
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(SELECT f2 FROM SUBSELECT_TBL WHERE CAST(upper.f2 AS float) = f3);
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SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
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FROM SUBSELECT_TBL upper
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WHERE f3 IN (SELECT upper.f1 + f2 FROM SUBSELECT_TBL
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WHERE f2 = CAST(f3 AS integer));
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SELECT '' AS five, f1 AS "Correlated Field"
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FROM SUBSELECT_TBL
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WHERE (f1, f2) IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
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WHERE f3 IS NOT NULL);
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--
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-- Use some existing tables in the regression test
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--
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SELECT '' AS eight, ss.f1 AS "Correlated Field", ss.f3 AS "Second Field"
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FROM SUBSELECT_TBL ss
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WHERE f1 NOT IN (SELECT f1+1 FROM INT4_TBL
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WHERE f1 != ss.f1 AND f1 < 2147483647);
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select q1, float8(count(*)) / (select count(*) from int8_tbl)
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from int8_tbl group by q1 order by q1;
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--
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-- Test cases to catch unpleasant interactions between IN-join processing
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-- and subquery pullup.
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--
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select count(*) from
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(select 1 from tenk1 a
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where unique1 IN (select hundred from tenk1 b)) ss;
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select count(distinct ss.ten) from
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(select ten from tenk1 a
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where unique1 IN (select hundred from tenk1 b)) ss;
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select count(*) from
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(select 1 from tenk1 a
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where unique1 IN (select distinct hundred from tenk1 b)) ss;
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select count(distinct ss.ten) from
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(select ten from tenk1 a
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where unique1 IN (select distinct hundred from tenk1 b)) ss;
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--
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-- Test cases to check for overenthusiastic optimization of
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-- "IN (SELECT DISTINCT ...)" and related cases. Per example from
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-- Luca Pireddu and Michael Fuhr.
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--
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CREATE TEMP TABLE foo (id integer);
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CREATE TEMP TABLE bar (id1 integer, id2 integer);
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INSERT INTO foo VALUES (1);
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INSERT INTO bar VALUES (1, 1);
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INSERT INTO bar VALUES (2, 2);
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INSERT INTO bar VALUES (3, 1);
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-- These cases require an extra level of distinct-ing above subquery s
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT DISTINCT id1, id2 FROM bar) AS s);
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT id1,id2 FROM bar GROUP BY id1,id2) AS s);
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT id1, id2 FROM bar UNION
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SELECT id1, id2 FROM bar) AS s);
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-- These cases do not
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT DISTINCT ON (id2) id1, id2 FROM bar) AS s);
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT id2 FROM bar GROUP BY id2) AS s);
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SELECT * FROM foo WHERE id IN
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(SELECT id2 FROM (SELECT id2 FROM bar UNION
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SELECT id2 FROM bar) AS s);
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--
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-- Test case to catch problems with multiply nested sub-SELECTs not getting
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-- recalculated properly. Per bug report from Didier Moens.
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--
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CREATE TABLE orderstest (
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approver_ref integer,
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po_ref integer,
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ordercancelled boolean
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);
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INSERT INTO orderstest VALUES (1, 1, false);
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INSERT INTO orderstest VALUES (66, 5, false);
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INSERT INTO orderstest VALUES (66, 6, false);
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INSERT INTO orderstest VALUES (66, 7, false);
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INSERT INTO orderstest VALUES (66, 1, true);
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INSERT INTO orderstest VALUES (66, 8, false);
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INSERT INTO orderstest VALUES (66, 1, false);
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INSERT INTO orderstest VALUES (77, 1, false);
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INSERT INTO orderstest VALUES (1, 1, false);
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INSERT INTO orderstest VALUES (66, 1, false);
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INSERT INTO orderstest VALUES (1, 1, false);
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CREATE VIEW orders_view AS
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SELECT *,
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(SELECT CASE
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WHEN ord.approver_ref=1 THEN '---' ELSE 'Approved'
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END) AS "Approved",
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(SELECT CASE
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WHEN ord.ordercancelled
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THEN 'Cancelled'
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ELSE
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(SELECT CASE
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WHEN ord.po_ref=1
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THEN
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(SELECT CASE
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WHEN ord.approver_ref=1
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THEN '---'
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ELSE 'Approved'
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END)
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ELSE 'PO'
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END)
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END) AS "Status",
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(CASE
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WHEN ord.ordercancelled
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THEN 'Cancelled'
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ELSE
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(CASE
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WHEN ord.po_ref=1
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THEN
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(CASE
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WHEN ord.approver_ref=1
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THEN '---'
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ELSE 'Approved'
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END)
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ELSE 'PO'
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END)
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END) AS "Status_OK"
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FROM orderstest ord;
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SELECT * FROM orders_view;
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DROP TABLE orderstest cascade;
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--
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-- Test cases to catch situations where rule rewriter fails to propagate
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-- hasSubLinks flag correctly. Per example from Kyle Bateman.
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--
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create temp table parts (
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partnum text,
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cost float8
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);
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create temp table shipped (
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ttype char(2),
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ordnum int4,
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partnum text,
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value float8
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);
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create temp view shipped_view as
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select * from shipped where ttype = 'wt';
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create rule shipped_view_insert as on insert to shipped_view do instead
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insert into shipped values('wt', new.ordnum, new.partnum, new.value);
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insert into parts (partnum, cost) values (1, 1234.56);
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insert into shipped_view (ordnum, partnum, value)
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values (0, 1, (select cost from parts where partnum = '1'));
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select * from shipped_view;
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create rule shipped_view_update as on update to shipped_view do instead
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update shipped set partnum = new.partnum, value = new.value
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where ttype = new.ttype and ordnum = new.ordnum;
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update shipped_view set value = 11
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from int4_tbl a join int4_tbl b
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on (a.f1 = (select f1 from int4_tbl c where c.f1=b.f1))
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where ordnum = a.f1;
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select * from shipped_view;
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select f1, ss1 as relabel from
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(select *, (select sum(f1) from int4_tbl b where f1 >= a.f1) as ss1
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from int4_tbl a) ss;
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--
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-- Test cases involving PARAM_EXEC parameters and min/max index optimizations.
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-- Per bug report from David Sanchez i Gregori.
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--
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select * from (
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select max(unique1) from tenk1 as a
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where exists (select 1 from tenk1 as b where b.thousand = a.unique2)
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) ss;
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select * from (
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select min(unique1) from tenk1 as a
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where not exists (select 1 from tenk1 as b where b.unique2 = 10000)
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) ss;
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--
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-- Test that an IN implemented using a UniquePath does unique-ification
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-- with the right semantics, as per bug #4113. (Unfortunately we have
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-- no simple way to ensure that this test case actually chooses that type
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-- of plan, but it does in releases 7.4-8.3. Note that an ordering difference
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-- here might mean that some other plan type is being used, rendering the test
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-- pointless.)
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--
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create temp table numeric_table (num_col numeric);
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insert into numeric_table values (1), (1.000000000000000000001), (2), (3);
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create temp table float_table (float_col float8);
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insert into float_table values (1), (2), (3);
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select * from float_table
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where float_col in (select num_col from numeric_table);
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select * from numeric_table
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where num_col in (select float_col from float_table);
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--
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-- Test case for bug #4290: bogus calculation of subplan param sets
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--
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create temp table ta (id int primary key, val int);
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insert into ta values(1,1);
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insert into ta values(2,2);
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create temp table tb (id int primary key, aval int);
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insert into tb values(1,1);
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insert into tb values(2,1);
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insert into tb values(3,2);
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insert into tb values(4,2);
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create temp table tc (id int primary key, aid int);
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insert into tc values(1,1);
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insert into tc values(2,2);
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select
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( select min(tb.id) from tb
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where tb.aval = (select ta.val from ta where ta.id = tc.aid) ) as min_tb_id
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from tc;
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--
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-- Test case for 8.3 "failed to locate grouping columns" bug
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--
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create temp table t1 (f1 numeric(14,0), f2 varchar(30));
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select * from
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(select distinct f1, f2, (select f2 from t1 x where x.f1 = up.f1) as fs
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from t1 up) ss
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group by f1,f2,fs;
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