diff options
Diffstat (limited to 'test/subquery.test')
| -rw-r--r-- | test/subquery.test | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/test/subquery.test b/test/subquery.test index a048f9ed4..c51edba04 100644 --- a/test/subquery.test +++ b/test/subquery.test @@ -11,8 +11,6 @@ # This file implements regression tests for SQLite library. The # focus of this script is testing correlated subqueries # -# $Id: subquery.test,v 1.17 2009/01/09 01:12:28 drh Exp $ -# set testdir [file dirname $argv0] source $testdir/tester.tcl @@ -613,4 +611,45 @@ do_execsql_test subquery-9.4 { SELECT (SELECT DISTINCT x FROM t1 ORDER BY +x LIMIT 1 OFFSET 2) FROM t1; } {{} {} {} {}} +# 2023-09-15 +# Query planner performance regression reported by private email +# on 2023-09-14, caused by VIEWSCAN optimization of check-in 609fbb94b8f01d67 +# from 2022-09-01. +# +reset_db +do_execsql_test subquery-10.1 { + CREATE TABLE t1(aa TEXT, bb INT, cc TEXT); + CREATE INDEX x11 on t1(bb); + CREATE INDEX x12 on t1(aa); + CREATE TABLE t2(aa TEXT, xx INT); + ANALYZE sqlite_master; + INSERT INTO sqlite_stat1(tbl, idx, stat) VALUES('t1', 'x11', '156789 28'); + INSERT INTO sqlite_stat1(tbl, idx, stat) VALUES('t1', 'x12', '156789 1'); + ANALYZE sqlite_master; +} +do_eqp_test subquery-10.2 { + WITH v1(aa,cc,bb) AS (SELECT aa, cc, bb FROM t1 WHERE bb=12345), + v2(aa,mx) AS (SELECT aa, max(xx) FROM t2 GROUP BY aa) + SELECT * FROM v1 JOIN v2 ON v1.aa=v2.aa; +} { + QUERY PLAN + |--CO-ROUTINE v2 + | |--SCAN t2 + | `--USE TEMP B-TREE FOR GROUP BY + |--SEARCH t1 USING INDEX x11 (bb=?) + `--SEARCH v2 USING AUTOMATIC COVERING INDEX (aa=?) +} +# ^^^^^^^^^^^^^ +# Prior to the fix the incorrect (slow) plan caused by the +# VIEWSCAN optimization was: +# +# QUERY PLAN +# |--CO-ROUTINE v2 +# | |--SCAN t2 +# | `--USE TEMP B-TREE FOR GROUP BY +# |--SCAN v2 +# `--SEARCH t1 USING INDEX x12 (aa=?) +# + + finish_test |