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Experimental implementation of NULLS FIRST/LAST. This branch still has problems - the most significant of which is that ORDER BY clauses with a non-default NULLS FIRST/LAST qualifier can never use an index.

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FossilOrigin-Name: 07babb0f897fc8c9cb5b30481899c32fdd743f3f3ca508d8d957826252107dd5
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dan
2019-08-12 16:36:38 +00:00
parent 41428a97b8
commit 6e11892db8
14 changed files with 171 additions and 64 deletions
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test/nulls1.test Normal file
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# 2019 August 10
#
# 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 SQLite library.
#
####################################################
# DO NOT EDIT! THIS FILE IS AUTOMATICALLY GENERATED!
####################################################
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix nulls1
do_execsql_test 1.0 {
DROP TABLE IF EXISTS t3;
CREATE TABLE t3(a INTEGER);
INSERT INTO t3 VALUES(NULL), (10), (30), (20), (NULL);
} {}
for {set a 0} {$a < 2} {incr a} {
foreach {tn limit} {
1 ""
2 "LIMIT 10"
} {
do_execsql_test 1.$a.$tn.1 "
SELECT a FROM t3 ORDER BY a nULLS FIRST $limit
" {{} {} 10 20 30}
do_execsql_test 1.$a.$tn.2 "
SELECT a FROM t3 ORDER BY a nULLS LAST $limit
" {10 20 30 {} {}}
do_execsql_test 1.$a.$tn.3 "
SELECT a FROM t3 ORDER BY a DESC nULLS FIRST $limit
" {{} {} 30 20 10}
do_execsql_test 1.$a.$tn.4 "
SELECT a FROM t3 ORDER BY a DESC nULLS LAST $limit
" {30 20 10 {} {}}
}
catchsql { CREATE INDEX i1 ON t3(a) }
}
finish_test