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Attempt to optimize "x IS NULL" and "x IS NOT NULL" expressions when x is a column with a NOT NULL constraint.

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FossilOrigin-Name: 5ecd842555009ce27ee6390325ac5c2504143474b12b730933f0833b3dad788a
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dan
2021-02-26 20:14:32 +00:00
parent 4b17455ab2
commit 8ddf686267
6 changed files with 150 additions and 9 deletions
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test/notnull2.test Normal file
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# 2021 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library. The
# focus of this file is testing optimizations associated with "IS NULL"
# and "IS NOT NULL" operators on columns with NOT NULL constraints.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix notnull2
do_execsql_test 1.0 {
CREATE TABLE t1(a, b);
CREATE TABLE t2(c, d NOT NULL);
WITH x(i) AS (
SELECT 1 UNION ALL SELECT i+1 FROM x WHERE i<1000
)
INSERT INTO t1 SELECT i, i FROM x;
INSERT INTO t2 SELECT * FROM t1;
}
proc do_vmstep_test {tn sql nstep {res {}}} {
uplevel [list do_execsql_test $tn.0 $sql $res]
set vmstep [db status vmstep]
if {[string range $nstep 0 0]=="+"} {
set body "if {$vmstep<$nstep} {
error \"got $vmstep, expected more than [string range $nstep 1 end]\"
}"
} else {
set body "if {$vmstep>$nstep} {
error \"got $vmstep, expected less than $nstep\"
}"
}
# set name "$tn.vmstep=$vmstep,expect=$nstep"
set name "$tn.1"
uplevel [list do_test $name $body {}]
}
do_vmstep_test 1.1.1 {
SELECT * FROM t1 LEFT JOIN t2 WHERE a=c AND d IS NULL;
} 100 {}
do_vmstep_test 1.1.2 {
SELECT * FROM t1 LEFT JOIN t2 WHERE a=c AND c IS NULL;
} +1000 {}
do_vmstep_test 1.2.1 {
SELECT * FROM ( SELECT * FROM t2 ) WHERE d IS NULL
} 100 {}
do_vmstep_test 1.2.2 {
SELECT * FROM ( SELECT * FROM t2 ) WHERE c IS NULL
} +1000 {}
do_vmstep_test 1.3.1 {
SELECT * FROM t2 WHERE d IS NULL
} 100 {}
do_vmstep_test 1.3.2 {
SELECT * FROM t2 WHERE c IS NULL
} +1000 {}
do_vmstep_test 1.4.1 {
SELECT (d IS NOT NULL) FROM t2 WHERE 0==( d IS NOT NULL )
} 100 {}
do_vmstep_test 1.4.2 {
SELECT * FROM t2 WHERE 0==( c IS NOT NULL )
} +1000 {}
do_vmstep_test 1.5.1 {
SELECT count(*) FROM t2 WHERE EXISTS(
SELECT t2.d IS NULL FROM t1 WHERE t1.a=450
)
} 10000 {1000}
do_vmstep_test 1.5.2 {
SELECT count(*) FROM t2 WHERE EXISTS(
SELECT t2.c IS NULL FROM t1 WHERE t1.a=450
)
} +100000 {1000}
finish_test