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Allow negative values for LIMIT and OFFSET. Add tests for negative LIMITs

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and OFFSETs.  Make the OFFSET work even if LIMIT is 0 or negative. (CVS 1052)

FossilOrigin-Name: e6a752bfef24f773973c151c6262ff331a9dc57a
This commit is contained in:
drh
2003-07-16 02:19:37 +00:00
parent d4f5ee2805
commit ef0cae500d
5 changed files with 80 additions and 32 deletions
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42
test/limit.test
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@ -12,7 +12,7 @@
# focus of this file is testing the LIMIT ... OFFSET ... clause
# of SELECT statements.
#
# $Id: limit.test,v 1.7 2003/02/20 00:44:53 drh Exp $
# $Id: limit.test,v 1.8 2003/07/16 02:19:38 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -163,4 +163,44 @@ do_test limit-5.5 {
}
} {1000 1528204 593161 0 3107 505 1005}
# There is some contraversy about whether LIMIT 0 should be the same as
# no limit at all or if LIMIT 0 should result in zero output rows.
#
do_test limit-6.1 {
execsql {
BEGIN;
CREATE TABLE t6(a);
INSERT INTO t6 VALUES(1);
INSERT INTO t6 VALUES(2);
INSERT INTO t6 SELECT a+2 FROM t6;
COMMIT;
SELECT * FROM t6;
}
} {1 2 3 4}
do_test limit-6.2 {
execsql {
SELECT * FROM t6 LIMIT -1 OFFSET -1;
}
} {1 2 3 4}
do_test limit-6.3 {
execsql {
SELECT * FROM t6 LIMIT 2 OFFSET -123;
}
} {1 2}
do_test limit-6.4 {
execsql {
SELECT * FROM t6 LIMIT -432 OFFSET 2;
}
} {3 4}
do_test limit-6.5 {
execsql {
SELECT * FROM t6 LIMIT 0
}
} {1 2 3 4}
do_test limit-6.6 {
execsql {
SELECT * FROM t6 LIMIT 0 OFFSET 1
}
} {2 3 4}
finish_test