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Make sure that a DISTINCT query with an ORDER BY works correctly even if

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it uses a descending index.  Fix for ticket [c5ea805691bfc4204b1cb9e].

FossilOrigin-Name: 0d3aef97ebddf422b8bdcbc5878970c6129e3f54
This commit is contained in:
drh
2014-12-04 21:54:58 +00:00
parent 1d32488037
commit dea7d70d1b
4 changed files with 39 additions and 10 deletions
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30
test/distinct.test
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@ -222,4 +222,34 @@ do_execsql_test 4.1 {
SELECT quote(x) FROM t2 ORDER BY 1;
} {'xyzzy' X'0000000000'}
#----------------------------------------------------------------------------
# Ticket [c5ea805691bfc4204b1cb9e9aa0103bd48bc7d34] (2014-12-04)
# Make sure that DISTINCT works together with ORDER BY and descending
# indexes.
#
do_execsql_test 5.1 {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(x);
INSERT INTO t1(x) VALUES(3),(1),(5),(2),(6),(4),(5),(1),(3);
CREATE INDEX t1x ON t1(x DESC);
SELECT DISTINCT x FROM t1 ORDER BY x ASC;
} {1 2 3 4 5 6}
do_execsql_test 5.2 {
SELECT DISTINCT x FROM t1 ORDER BY x DESC;
} {6 5 4 3 2 1}
do_execsql_test 5.3 {
SELECT DISTINCT x FROM t1 ORDER BY x;
} {1 2 3 4 5 6}
do_execsql_test 5.4 {
DROP INDEX t1x;
CREATE INDEX t1x ON t1(x ASC);
SELECT DISTINCT x FROM t1 ORDER BY x ASC;
} {1 2 3 4 5 6}
do_execsql_test 5.5 {
SELECT DISTINCT x FROM t1 ORDER BY x DESC;
} {6 5 4 3 2 1}
do_execsql_test 5.6 {
SELECT DISTINCT x FROM t1 ORDER BY x;
} {1 2 3 4 5 6}
finish_test