a43f02efc6
optimization that converts compound selects with ORDER BY COLLATE into subqueries. FossilOrigin-Name: c72324ef9243946550ae3d974826502b1cc5eb10
101 lines
2.9 KiB
Plaintext
101 lines
2.9 KiB
Plaintext
# 2013-05-07
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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 compound SELECT statements
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# that have ORDER BY clauses with collating sequences that differ
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# from the collating sequence used for comparison in the compound.
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#
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# Ticket 6709574d2a8d8b9be3a9cb1afbf4ff2de48ea4e7:
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# drh added on 2013-05-06 15:21:16:
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#
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# In the code shown below (which is intended to be run from the
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# sqlite3.exe command-line tool) the three SELECT statements should all
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# generate the same answer. But the third one does not. It is as if the
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# COLLATE clause on the ORDER BY somehow got pulled into the EXCEPT
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# operator. Note that the ".print" commands are instructions to the
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# sqlite3.exe shell program to output delimiter lines so that you can more
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# easily tell where the output of one query ends and the next query
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# begins.
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#
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# CREATE TABLE t1(a);
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# INSERT INTO t1 VALUES('abc'),('def');
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# CREATE TABLE t2(a);
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# INSERT INTO t2 VALUES('DEF');
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#
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# SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a;
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# .print -----
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# SELECT a FROM (SELECT a FROM t1 EXCEPT SELECT a FROM t2)
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# ORDER BY a COLLATE nocase;
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# .print -----
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# SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a COLLATE nocase;
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#
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# Bisecting shows that this problem was introduced in SQLite version 3.6.0
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# by check-in [8bbfa97837a74ef] on 2008-06-15.
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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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do_test selectE-1.0 {
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db eval {
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CREATE TABLE t1(a);
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INSERT INTO t1 VALUES('abc'),('def'),('ghi');
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CREATE TABLE t2(a);
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INSERT INTO t2 VALUES('DEF'),('abc');
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CREATE TABLE t3(a);
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INSERT INTO t3 VALUES('def'),('jkl');
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SELECT a FROM t1 EXCEPT SELECT a FROM t2
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ORDER BY a COLLATE nocase;
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}
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} {def ghi}
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do_test selectE-1.1 {
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db eval {
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SELECT a FROM t2 EXCEPT SELECT a FROM t3
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ORDER BY a COLLATE nocase;
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}
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} {abc DEF}
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do_test selectE-1.2 {
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db eval {
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SELECT a FROM t2 EXCEPT SELECT a FROM t3
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ORDER BY a COLLATE binary;
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}
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} {DEF abc}
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do_test selectE-1.3 {
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db eval {
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SELECT a FROM t2 EXCEPT SELECT a FROM t3
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ORDER BY a;
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}
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} {DEF abc}
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do_test selectE-2.1 {
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db eval {
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DELETE FROM t2;
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DELETE FROM t3;
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INSERT INTO t2 VALUES('ABC'),('def'),('GHI'),('jkl');
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INSERT INTO t3 SELECT lower(a) FROM t2;
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SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
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ORDER BY 1
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}
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} {}
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do_test selectE-2.2 {
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db eval {
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SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
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ORDER BY 1 COLLATE binary
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}
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} {}
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do_catchsql_test selectE-3.1 {
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SELECT 1 EXCEPT SELECT 2 ORDER BY 1 COLLATE nocase EXCEPT SELECT 3;
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} {1 {ORDER BY clause should come after EXCEPT not before}}
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finish_test
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