3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
6 # May you do good and not evil.
7 # May you find forgiveness for yourself and forgive others.
8 # May you share freely, never taking more than you give.
10 #***********************************************************************
11 # This file implements regression tests for SQLite library. The
12 # focus of this file is testing the LIMIT in combination with ORDER BY
13 # and in particular, the optimizations in the inner loop that cause an
14 # early exit of the inner loop when the LIMIT is reached and the inner
15 # loop is emitting rows in ORDER BY order.
18 set testdir [file dirname $argv0]
19 source $testdir/tester.tcl
22 do_execsql_test limit2-100 {
24 WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
25 INSERT INTO t1(a,b) SELECT 1, (x*17)%1000 + 1000 FROM c;
26 INSERT INTO t1(a,b) VALUES(2,2),(3,1006),(4,4),(5,9999);
27 CREATE INDEX t1ab ON t1(a,b);
29 set sqlite_search_count 0
30 do_execsql_test limit2-100.1 {
31 SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b LIMIT 5;
32 } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
33 set fast_count $sqlite_search_count
34 set sqlite_search_count 0
35 do_execsql_test limit2-100.2 {
36 SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b LIMIT 5;
37 } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
38 do_test limit2-100.3 {
39 set slow_count $sqlite_search_count
40 expr {$fast_count < 0.02*$slow_count}
43 do_execsql_test limit2-110 {
45 INSERT INTO t2(x,y) VALUES('a',1),('a',2),('a',3),('a',4);
46 INSERT INTO t2(x,y) VALUES('b',1),('c',2),('d',3),('e',4);
47 CREATE INDEX t2xy ON t2(x,y);
49 set sqlite_search_count 0
50 do_execsql_test limit2-110.1 {
51 SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY t1.b LIMIT 5;
52 } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
53 set fast_count $sqlite_search_count
54 set sqlite_search_count 0
55 do_execsql_test limit2-110.2 {
56 SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY +t1.b LIMIT 5;
57 } {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
58 set slow_count $sqlite_search_count
59 do_test limit2-110.3 {
60 expr {$fast_count < 0.02*$slow_count}
63 do_execsql_test limit2-120 {
65 CREATE INDEX t1ab ON t1(a,b DESC);
67 set sqlite_search_count 0
68 do_execsql_test limit2-120.1 {
69 SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b DESC LIMIT 5;
70 } {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
71 set fast_count $sqlite_search_count
72 set sqlite_search_count 0
73 do_execsql_test limit2-120.2 {
74 SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b DESC LIMIT 5;
75 } {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
76 do_test limit2-120.3 {
77 set slow_count $sqlite_search_count
78 expr {$fast_count < 0.02*$slow_count}
81 # Bug report against the new ORDER BY LIMIT optimization just prior to
82 # release. (Unreleased so there is no ticket).
84 # Make sure the optimization is not applied if the inner loop can only
85 # provide a single row of output.
87 do_execsql_test limit2-200 {
88 CREATE TABLE t200(a, b);
89 WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
90 INSERT INTO t200(a,b) SELECT x, x FROM c;
91 CREATE TABLE t201(x INTEGER PRIMARY KEY, y);
92 INSERT INTO t201(x,y) VALUES(2,12345);
94 SELECT *, '|' FROM t200, t201 WHERE x=b ORDER BY y LIMIT 3;
96 do_execsql_test limit2-210 {
97 SELECT *, '|' FROM t200 LEFT JOIN t201 ON x=b ORDER BY y LIMIT 3;
98 } {1 1 {} {} | 3 3 {} {} | 4 4 {} {} |}
100 # Bug in the ORDER BY LIMIT optimization reported on 2016-09-06.
101 # Ticket https://www.sqlite.org/src/info/559733b09e96
103 do_execsql_test limit2-300 {
104 CREATE TABLE t300(a,b,c);
105 CREATE INDEX t300x ON t300(a,b,c);
106 INSERT INTO t300 VALUES(0,1,99),(0,1,0),(0,0,0);
107 SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC;
108 } {0 1 99 . 0 0 0 . 0 1 0 .}
109 do_execsql_test limit2-310 {
110 SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC LIMIT 1;
113 # Make sure the SELECT loop is ordered correctly for the direction of
116 do_execsql_test limit2-400 {
117 CREATE TABLE t400(a,b);
118 CREATE INDEX t400_ab ON t400(a,b);
119 INSERT INTO t400(a,b) VALUES(1,90),(1,40),(2,80),(2,30),(3,70),(3,20);
120 SELECT *,'x' FROM t400 WHERE a IN (1,2,3) ORDER BY b DESC LIMIT 3;
121 SELECT *,'y' FROM t400 WHERE a IN (1,2,3) ORDER BY +b DESC LIMIT 3;
122 } {1 90 x 2 80 x 3 70 x 1 90 y 2 80 y 3 70 y}
125 do_execsql_test 500 {
126 CREATE TABLE t500(i INTEGER PRIMARY KEY, j);
127 INSERT INTO t500 VALUES(1, 1);
128 INSERT INTO t500 VALUES(2, 2);
129 INSERT INTO t500 VALUES(3, 3);
130 INSERT INTO t500 VALUES(4, 0);
131 INSERT INTO t500 VALUES(5, 5);
132 SELECT j FROM t500 WHERE i IN (1,2,3,4,5) ORDER BY j DESC LIMIT 3;
134 do_execsql_test 501 {
135 CREATE TABLE t501(i INTEGER PRIMARY KEY, j);
136 INSERT INTO t501 VALUES(1, 5);
137 INSERT INTO t501 VALUES(2, 4);
138 INSERT INTO t501 VALUES(3, 3);
139 INSERT INTO t501 VALUES(4, 6);
140 INSERT INTO t501 VALUES(5, 1);
141 SELECT j FROM t501 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3;
143 do_execsql_test 502 {
144 CREATE TABLE t502(i INT PRIMARY KEY, j);
145 INSERT INTO t502 VALUES(1, 5);
146 INSERT INTO t502 VALUES(2, 4);
147 INSERT INTO t502 VALUES(3, 3);
148 INSERT INTO t502 VALUES(4, 6);
149 INSERT INTO t502 VALUES(5, 1);
150 SELECT j FROM t502 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3;
153 # Ticket https://www.sqlite.org/src/info/123c9ba32130a6c9 2017-12-13
154 # Incorrect result when an idnex is used for an ordered join.
156 # This test case is in the limit2.test module because the problem was first
157 # exposed by check-in https://www.sqlite.org/src/info/559733b09e which
158 # implemented the ORDER BY LIMIT optimization that limit2.test strives to
161 do_execsql_test 600 {
162 DROP TABLE IF EXISTS t1;
163 CREATE TABLE t1(a, b); INSERT INTO t1 VALUES(1,2);
164 DROP TABLE IF EXISTS t2;
165 CREATE TABLE t2(x, y); INSERT INTO t2 VALUES(1,3);
166 CREATE INDEX t1ab ON t1(a,b);
167 SELECT y FROM t1, t2 WHERE a=x AND b<=y ORDER BY b DESC;
170 # Ticket https://www.sqlite.org/src/info/9936b2fa443fec03 2018-09-08
171 # Infinite loop due to the ORDER BY LIMIT optimization.
173 do_execsql_test 700 {
174 DROP TABLE IF EXISTS t1;
175 DROP TABLE IF EXISTS t2;
176 CREATE TABLE t1(aa VARCHAR PRIMARY KEY NOT NULL,bb,cc,x VARCHAR(400));
177 INSERT INTO t1(aa,bb,cc) VALUES('maroon','meal','lecture');
178 INSERT INTO t1(aa,bb,cc) VALUES('reality','meal','catsear');
179 CREATE TABLE t2(aa VARCHAR PRIMARY KEY, dd INT DEFAULT 1, ee, x VARCHAR(100));
180 INSERT INTO t2(aa,dd,ee) VALUES('maroon',0,'travel'),('reality',0,'hour');
181 CREATE INDEX t2x1 ON t2(dd,ee);
183 DROP TABLE IF EXISTS sqlite_stat4;
184 DELETE FROM sqlite_stat1;
185 INSERT INTO sqlite_stat1 VALUES
186 ('t2','t2x1','3 3 3'),
187 ('t2','sqlite_autoindex_t2_1','3 1'),
188 ('t1','sqlite_autoindex_t1_1','2 1');
189 ANALYZE sqlite_master;
191 FROM t1 LEFT JOIN t2 ON t1.aa=t2.aa
195 } {maroon meal lecture {} maroon 0 travel {}}
196 do_execsql_test 710 {
199 CREATE TABLE t1(aa, bb);
200 INSERT INTO t1 VALUES('maroon','meal');
201 CREATE TABLE t2(cc, dd, ee, x VARCHAR(100));
202 INSERT INTO t2(cc,dd,ee) VALUES('maroon',1,'one');
203 INSERT INTO t2(cc,dd,ee) VALUES('maroon',2,'two');
204 INSERT INTO t2(cc,dd,ee) VALUES('maroon',0,'zero');
205 CREATE INDEX t2ddee ON t2(dd,ee);
206 CREATE INDEX t2cc ON t2(cc);
208 SELECT t2.cc, t2.dd, t2.ee FROM t1 CROSS JOIN t2 ON t1.aa=t2.cc
209 ORDER BY t2.dd LIMIT 1;
211 do_execsql_test 720 {
212 SELECT t2.cc, t2.dd, t2.ee FROM t1 CROSS JOIN t2 ON t1.aa=t2.cc
214 ORDER BY t2.dd LIMIT 1;