71 lines
2.2 KiB
Plaintext
71 lines
2.2 KiB
Plaintext
# 2018-07-26
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this file is testing the WHERE-clause constant propagation
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# optimization.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set ::testprefix whereL
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do_execsql_test 100 {
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CREATE TABLE t1(a INT PRIMARY KEY, b, c, d, e);
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CREATE TABLE t2(a INT PRIMARY KEY, f, g, h, i);
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CREATE TABLE t3(a INT PRIMARY KEY, j, k, l, m);
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CREATE VIEW v4 AS SELECT * FROM t2 UNION ALL SELECT * FROM t3;
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}
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do_eqp_test 110 {
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SELECT * FROM t1, v4 WHERE t1.a=?1 AND v4.a=t1.a;
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} {
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QUERY PLAN
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|--MATERIALIZE xxxxxx
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| `--COMPOUND QUERY
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| |--LEFT-MOST SUBQUERY
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| | `--SEARCH TABLE t2 USING INDEX sqlite_autoindex_t2_1 (a=?)
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| `--UNION ALL
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| `--SEARCH TABLE t3 USING INDEX sqlite_autoindex_t3_1 (a=?)
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|--SCAN SUBQUERY xxxxxx
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`--SEARCH TABLE t1 USING INDEX sqlite_autoindex_t1_1 (a=?)
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}
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# The scan of the t1 table goes first since that enables the ORDER BY
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# sort to be omitted. This would not be possible without constant
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# propagation because without it the t1 table would depend on t3.
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#
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do_eqp_test 120 {
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SELECT * FROM t1, t2, t3
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WHERE t1.a=t2.a AND t2.a=t3.j AND t3.j=5
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ORDER BY t1.a;
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} {
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QUERY PLAN
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|--SEARCH TABLE t1 USING INDEX sqlite_autoindex_t1_1 (a=?)
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|--SEARCH TABLE t2 USING INDEX sqlite_autoindex_t2_1 (a=?)
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`--SCAN TABLE t3
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}
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# Constant propagation in the face of collating sequences:
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#
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do_execsql_test 200 {
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CREATE TABLE c3(x COLLATE binary, y COLLATE nocase, z COLLATE binary);
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CREATE INDEX c3x ON c3(x);
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INSERT INTO c3 VALUES('ABC', 'ABC', 'abc');
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SELECT * FROM c3 WHERE x=y AND y=z AND z='abc';
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} {ABC ABC abc}
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# If the constants are blindly propagated, as shown in the following
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# query, the wrong answer results:
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#
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do_execsql_test 201 {
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SELECT * FROM c3 WHERE x='abc' AND y='abc' AND z='abc';
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} {}
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finish_test
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