# 2013-05-07 # # 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 compound SELECT statements # that have ORDER BY clauses with collating sequences that differ # from the collating sequence used for comparison in the compound. # # Ticket 6709574d2a8d8b9be3a9cb1afbf4ff2de48ea4e7: # drh added on 2013-05-06 15:21:16: # # In the code shown below (which is intended to be run from the # sqlite3.exe command-line tool) the three SELECT statements should all # generate the same answer. But the third one does not. It is as if the # COLLATE clause on the ORDER BY somehow got pulled into the EXCEPT # operator. Note that the ".print" commands are instructions to the # sqlite3.exe shell program to output delimiter lines so that you can more # easily tell where the output of one query ends and the next query # begins. # # CREATE TABLE t1(a); # INSERT INTO t1 VALUES('abc'),('def'); # CREATE TABLE t2(a); # INSERT INTO t2 VALUES('DEF'); # # SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a; # .print ----- # SELECT a FROM (SELECT a FROM t1 EXCEPT SELECT a FROM t2) # ORDER BY a COLLATE nocase; # .print ----- # SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a COLLATE nocase; # # Bisecting shows that this problem was introduced in SQLite version 3.6.0 # by check-in [8bbfa97837a74ef] on 2008-06-15. # set testdir [file dirname $argv0] source $testdir/tester.tcl do_test selectE-1.0 { db eval { CREATE TABLE t1(a); INSERT INTO t1 VALUES('abc'),('def'),('ghi'); CREATE TABLE t2(a); INSERT INTO t2 VALUES('DEF'),('abc'); CREATE TABLE t3(a); INSERT INTO t3 VALUES('def'),('jkl'); SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a COLLATE nocase; } } {def ghi} do_test selectE-1.1 { db eval { SELECT a FROM t2 EXCEPT SELECT a FROM t3 ORDER BY a COLLATE nocase; } } {abc DEF} do_test selectE-1.2 { db eval { SELECT a FROM t2 EXCEPT SELECT a FROM t3 ORDER BY a COLLATE binary; } } {DEF abc} do_test selectE-1.3 { db eval { SELECT a FROM t2 EXCEPT SELECT a FROM t3 ORDER BY a; } } {DEF abc} do_test selectE-2.1 { db eval { DELETE FROM t2; DELETE FROM t3; INSERT INTO t2 VALUES('ABC'),('def'),('GHI'),('jkl'); INSERT INTO t3 SELECT lower(a) FROM t2; SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3 ORDER BY 1 } } {} do_test selectE-2.2 { db eval { SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3 ORDER BY 1 COLLATE binary } } {} finish_test