# 2016-05-20 # # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # This file implements regression tests for SQLite library. The # focus of this file is testing the LIMIT in combination with ORDER BY # and in particular, the optimizations in the inner loop that cause an # early exit of the inner loop when the LIMIT is reached and the inner # loop is emitting rows in ORDER BY order. set testdir [file dirname $argv0] source $testdir/tester.tcl set testprefix limit2 do_execsql_test limit2-100 { CREATE TABLE t1(a,b); WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000) INSERT INTO t1(a,b) SELECT 1, (x*17)%1000 + 1000 FROM c; INSERT INTO t1(a,b) VALUES(2,2),(3,1006),(4,4),(5,9999); CREATE INDEX t1ab ON t1(a,b); } set sqlite_search_count 0 do_execsql_test limit2-100.1 { SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b LIMIT 5; } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |} set fast_count $sqlite_search_count set sqlite_search_count 0 do_execsql_test limit2-100.2 { SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b LIMIT 5; } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |} do_test limit2-100.3 { set slow_count $sqlite_search_count expr {$fast_count < 0.02*$slow_count} } {1} do_execsql_test limit2-110 { CREATE TABLE t2(x,y); INSERT INTO t2(x,y) VALUES('a',1),('a',2),('a',3),('a',4); INSERT INTO t2(x,y) VALUES('b',1),('c',2),('d',3),('e',4); CREATE INDEX t2xy ON t2(x,y); } set sqlite_search_count 0 do_execsql_test limit2-110.1 { SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY t1.b LIMIT 5; } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |} set fast_count $sqlite_search_count set sqlite_search_count 0 do_execsql_test limit2-110.2 { SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY +t1.b LIMIT 5; } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |} set slow_count $sqlite_search_count do_test limit2-110.3 { expr {$fast_count < 0.02*$slow_count} } {1} do_execsql_test limit2-120 { DROP INDEX t1ab; CREATE INDEX t1ab ON t1(a,b DESC); } set sqlite_search_count 0 do_execsql_test limit2-120.1 { SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b DESC LIMIT 5; } {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |} set fast_count $sqlite_search_count set sqlite_search_count 0 do_execsql_test limit2-120.2 { SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b DESC LIMIT 5; } {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |} do_test limit2-120.3 { set slow_count $sqlite_search_count expr {$fast_count < 0.02*$slow_count} } {1} # Bug report against the new ORDER BY LIMIT optimization just prior to # release. (Unreleased so there is no ticket). # # Make sure the optimization is not applied if the inner loop can only # provide a single row of output. # do_execsql_test limit2-200 { CREATE TABLE t200(a, b); WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000) INSERT INTO t200(a,b) SELECT x, x FROM c; CREATE TABLE t201(x INTEGER PRIMARY KEY, y); INSERT INTO t201(x,y) VALUES(2,12345); SELECT *, '|' FROM t200, t201 WHERE x=b ORDER BY y LIMIT 3; } {2 2 2 12345 |} do_execsql_test limit2-210 { SELECT *, '|' FROM t200 LEFT JOIN t201 ON x=b ORDER BY y LIMIT 3; } {1 1 {} {} | 3 3 {} {} | 4 4 {} {} |} # Bug in the ORDER BY LIMIT optimization reported on 2016-09-06. # Ticket https://www.sqlite.org/src/info/559733b09e96 # do_execsql_test limit2-300 { CREATE TABLE t300(a,b,c); CREATE INDEX t300x ON t300(a,b,c); INSERT INTO t300 VALUES(0,1,99),(0,1,0),(0,0,0); SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC; } {0 1 99 . 0 0 0 . 0 1 0 .} do_execsql_test limit2-310 { SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC LIMIT 1; } {0 1 99 .} # Make sure the SELECT loop is ordered correctly for the direction of # the ORDER BY # do_execsql_test limit2-400 { CREATE TABLE t400(a,b); CREATE INDEX t400_ab ON t400(a,b); INSERT INTO t400(a,b) VALUES(1,90),(1,40),(2,80),(2,30),(3,70),(3,20); SELECT *,'x' FROM t400 WHERE a IN (1,2,3) ORDER BY b DESC LIMIT 3; SELECT *,'y' FROM t400 WHERE a IN (1,2,3) ORDER BY +b DESC LIMIT 3; } {1 90 x 2 80 x 3 70 x 1 90 y 2 80 y 3 70 y} do_execsql_test 500 { CREATE TABLE t500(i INTEGER PRIMARY KEY, j); INSERT INTO t500 VALUES(1, 1); INSERT INTO t500 VALUES(2, 2); INSERT INTO t500 VALUES(3, 3); INSERT INTO t500 VALUES(4, 0); INSERT INTO t500 VALUES(5, 5); SELECT j FROM t500 WHERE i IN (1,2,3,4,5) ORDER BY j DESC LIMIT 3; } {5 3 2} do_execsql_test 501 { CREATE TABLE t501(i INTEGER PRIMARY KEY, j); INSERT INTO t501 VALUES(1, 5); INSERT INTO t501 VALUES(2, 4); INSERT INTO t501 VALUES(3, 3); INSERT INTO t501 VALUES(4, 6); INSERT INTO t501 VALUES(5, 1); SELECT j FROM t501 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3; } {1 3 4} do_execsql_test 502 { CREATE TABLE t502(i INT PRIMARY KEY, j); INSERT INTO t502 VALUES(1, 5); INSERT INTO t502 VALUES(2, 4); INSERT INTO t502 VALUES(3, 3); INSERT INTO t502 VALUES(4, 6); INSERT INTO t502 VALUES(5, 1); SELECT j FROM t502 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3; } {1 3 4} # Ticket https://www.sqlite.org/src/info/123c9ba32130a6c9 2017-12-13 # Incorrect result when an idnex is used for an ordered join. # # This test case is in the limit2.test module because the problem was first # exposed by check-in https://www.sqlite.org/src/info/559733b09e which # implemented the ORDER BY LIMIT optimization that limit2.test strives to # test. # do_execsql_test 600 { DROP TABLE IF EXISTS t1; CREATE TABLE t1(a, b); INSERT INTO t1 VALUES(1,2); DROP TABLE IF EXISTS t2; CREATE TABLE t2(x, y); INSERT INTO t2 VALUES(1,3); CREATE INDEX t1ab ON t1(a,b); SELECT y FROM t1, t2 WHERE a=x AND b<=y ORDER BY b DESC; } {3} # Ticket https://www.sqlite.org/src/info/9936b2fa443fec03 2018-09-08 # Infinite loop due to the ORDER BY LIMIT optimization. # do_execsql_test 700 { DROP TABLE IF EXISTS t1; DROP TABLE IF EXISTS t2; CREATE TABLE t1(aa VARCHAR PRIMARY KEY NOT NULL,bb,cc,x VARCHAR(400)); INSERT INTO t1(aa,bb,cc) VALUES('maroon','meal','lecture'); INSERT INTO t1(aa,bb,cc) VALUES('reality','meal','catsear'); CREATE TABLE t2(aa VARCHAR PRIMARY KEY, dd INT DEFAULT 1, ee, x VARCHAR(100)); INSERT INTO t2(aa,dd,ee) VALUES('maroon',0,'travel'),('reality',0,'hour'); CREATE INDEX t2x1 ON t2(dd,ee); ANALYZE; DROP TABLE IF EXISTS sqlite_stat4; DELETE FROM sqlite_stat1; INSERT INTO sqlite_stat1 VALUES ('t2','t2x1','3 3 3'), ('t2','sqlite_autoindex_t2_1','3 1'), ('t1','sqlite_autoindex_t1_1','2 1'); ANALYZE sqlite_master; SELECT * FROM t1 LEFT JOIN t2 ON t1.aa=t2.aa WHERE t1.bb='meal' ORDER BY t2.dd DESC LIMIT 1; } {maroon meal lecture {} maroon 0 travel {}} do_execsql_test 710 { DROP TABLE t1; DROP TABLE t2; CREATE TABLE t1(aa, bb); INSERT INTO t1 VALUES('maroon','meal'); CREATE TABLE t2(cc, dd, ee, x VARCHAR(100)); INSERT INTO t2(cc,dd,ee) VALUES('maroon',1,'one'); INSERT INTO t2(cc,dd,ee) VALUES('maroon',2,'two'); INSERT INTO t2(cc,dd,ee) VALUES('maroon',0,'zero'); CREATE INDEX t2ddee ON t2(dd,ee); CREATE INDEX t2cc ON t2(cc); ANALYZE; SELECT t2.cc, t2.dd, t2.ee FROM t1 CROSS JOIN t2 ON t1.aa=t2.cc ORDER BY t2.dd LIMIT 1; } {maroon 0 zero} do_execsql_test 720 { SELECT t2.cc, t2.dd, t2.ee FROM t1 CROSS JOIN t2 ON t1.aa=t2.cc WHERE t1.bb='meal' ORDER BY t2.dd LIMIT 1; } {maroon 0 zero} finish_test