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 WHERE-clause constant propagation
15 set testdir [file dirname $argv0]
16 source $testdir/tester.tcl
17 set ::testprefix whereL
20 CREATE TABLE t1(a INT PRIMARY KEY, b, c, d, e);
21 CREATE TABLE t2(a INT PRIMARY KEY, f, g, h, i);
22 CREATE TABLE t3(a INT PRIMARY KEY, j, k, l, m);
23 CREATE VIEW v4 AS SELECT * FROM t2 UNION ALL SELECT * FROM t3;
26 SELECT * FROM t1, v4 WHERE t1.a=?1 AND v4.a=t1.a;
31 | |--LEFT-MOST SUBQUERY
32 | | `--SEARCH TABLE t2 USING INDEX sqlite_autoindex_t2_1 (a=?)
34 | `--SEARCH TABLE t3 USING INDEX sqlite_autoindex_t3_1 (a=?)
35 |--SCAN SUBQUERY xxxxxx
36 `--SEARCH TABLE t1 USING INDEX sqlite_autoindex_t1_1 (a=?)
39 # The scan of the t1 table goes first since that enables the ORDER BY
40 # sort to be omitted. This would not be possible without constant
41 # propagation because without it the t1 table would depend on t3.
44 SELECT * FROM t1, t2, t3
45 WHERE t1.a=t2.a AND t2.a=t3.j AND t3.j=5
49 |--SEARCH TABLE t1 USING INDEX sqlite_autoindex_t1_1 (a=?)
50 |--SEARCH TABLE t2 USING INDEX sqlite_autoindex_t2_1 (a=?)
54 # Constant propagation in the face of collating sequences:
57 CREATE TABLE c3(x COLLATE binary, y COLLATE nocase, z COLLATE binary);
58 CREATE INDEX c3x ON c3(x);
59 INSERT INTO c3 VALUES('ABC', 'ABC', 'abc');
60 SELECT * FROM c3 WHERE x=y AND y=z AND z='abc';
63 # If the constants are blindly propagated, as shown in the following
64 # query, the wrong answer results:
67 SELECT * FROM c3 WHERE x='abc' AND y='abc' AND z='abc';
70 # Constant propagation caused an incorrect answer in the following
71 # query. (Reported by Bentley system on 2018-08-09.)
74 CREATE TABLE A(id INTEGER PRIMARY KEY, label TEXT);
75 CREATE TABLE B(id INTEGER PRIMARY KEY, label TEXT, Aid INTEGER);
77 id INTEGER PRIMARY KEY,
82 CREATE UNIQUE INDEX x2 ON C(yy);
83 CREATE UNIQUE INDEX x4 ON C(yy, zz);
84 INSERT INTO A(id) VALUES(1);
85 INSERT INTO B(id) VALUES(2);
86 INSERT INTO C(id,xx,yy,zz) VALUES(99,50,1,2);
89 (SELECT id,xx,yy,zz FROM C) subq,
98 (SELECT id,xx,yy,zz FROM C) subq,
104 do_execsql_test 302 {
107 (SELECT id,yy,zz FROM C) subq,