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Add support for using indexes for some ORDER BY clauses that use non-default NULL handling. Still some problems on this branch.

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FossilOrigin-Name: 81069d7196857e909c94195d67388f71bc9f832eafd9156d8c5cdddb63513b4a
This commit is contained in:
dan
2019-08-16 21:07:19 +00:00
parent 6e11892db8
commit 15750a26fa
6 changed files with 133 additions and 69 deletions
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46
test/nulls1.test
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@ -11,21 +11,19 @@
# This file implements regression tests for SQLite library.
#
####################################################
# DO NOT EDIT! THIS FILE IS AUTOMATICALLY GENERATED!
####################################################
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix nulls1
if 1 {
do_execsql_test 1.0 {
DROP TABLE IF EXISTS t3;
CREATE TABLE t3(a INTEGER);
INSERT INTO t3 VALUES(NULL), (10), (30), (20), (NULL);
} {}
for {set a 0} {$a < 2} {incr a} {
for {set a 0} {$a < 3} {incr a} {
foreach {tn limit} {
1 ""
2 "LIMIT 10"
@ -47,7 +45,43 @@ for {set a 0} {$a < 2} {incr a} {
" {30 20 10 {} {}}
}
catchsql { CREATE INDEX i1 ON t3(a) }
switch $a {
0 {
execsql { CREATE INDEX i1 ON t3(a) }
}
1 {
execsql { DROP INDEX i1 ; CREATE INDEX i1 ON t3(a DESC) }
}
}
}
}
#-------------------------------------------------------------------------
reset_db
do_execsql_test 2.0 {
CREATE TABLE t2(a, b, c);
CREATE INDEX i2 ON t2(a, b);
INSERT INTO t2 VALUES(1, 1, 1);
INSERT INTO t2 VALUES(1, NULL, 2);
INSERT INTO t2 VALUES(1, NULL, 3);
INSERT INTO t2 VALUES(1, 4, 4);
}
do_execsql_test 2.1 {
SELECT * FROM t2 WHERE a=1 ORDER BY b NULLS LAST
} {
1 1 1 1 4 4 1 {} 2 1 {} 3
}
do_execsql_test 2.2 {
SELECT * FROM t2 WHERE a=1 ORDER BY b DESC NULLS FIRST
} {
1 {} 3
1 {} 2
1 4 4
1 1 1
}
finish_test