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test/tkt2942.test
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drh
Do not apply the query flattening optimization when the outer query is an
15 фев 2008, 17:33
15 фев 2008, 17:33
c52e355
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# 2008 February 15 # # 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. # #*********************************************************************** # # Ticket #2942. # # Queries of the form: # # SELECT group_concat(x) FROM (SELECT * FROM table ORDER BY 1); # # The ORDER BY would be dropped by the query flattener. This used # to not matter because aggregate functions sum(), min(), max(), avg(), # and so forth give the same result regardless of the order of inputs. # But with the addition of the group_concat() function, suddenly the # order does matter. # # $Id: tkt2942.test,v 1.1 2008/02/15 14:33:04 drh Exp $ # set testdir [file dirname $argv0] source $testdir/tester.tcl ifcapable !subquery { finish_test return } do_test tkt2942.1 { execsql { create table t1(num int); insert into t1 values (2); insert into t1 values (1); insert into t1 values (3); insert into t1 values (4); SELECT group_concat(num) FROM (SELECT num FROM t1 ORDER BY num DESC); } } {4,3,2,1} do_test tkt2942.2 { execsql { SELECT group_concat(num) FROM (SELECT num FROM t1 ORDER BY num); } } {1,2,3,4} do_test tkt2942.3 { execsql { SELECT group_concat(num) FROM (SELECT num FROM t1); } } {2,1,3,4} do_test tkt2942.4 { execsql { SELECT group_concat(num) FROM (SELECT num FROM t1 ORDER BY rowid DESC); } } {4,3,1,2} finish_test