81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
|
# 2018-06-07
|
||
|
|
#
|
||
|
|
# 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.
|
||
|
|
#
|
||
|
|
#***********************************************************************
|
||
|
|
#
|
||
|
|
# A multi-key index that uses an IN operator on one of the keys other
|
||
|
|
# than the left-most key is able to abort the IN-operator loop early
|
||
|
|
# if key terms further to the left do not match.
|
||
|
|
#
|
||
|
|
# Call this the "multikey-IN-operator early-out optimization" or
|
||
|
|
# just "IN-early-out" optimization for short.
|
||
|
|
#
|
||
|
|
|
||
|
|
set testdir [file dirname $argv0]
|
||
|
|
source $testdir/tester.tcl
|
||
|
|
set testprefix in6
|
||
|
|
|
||
|
|
do_test in6-1.1 {
|
||
|
|
db eval {
|
||
|
|
CREATE TABLE t1(a,b,c,d);
|
||
|
|
WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)
|
||
|
|
INSERT INTO t1(a,b,c,d)
|
||
|
|
SELECT 100, 200+x/2, 300+x/5, x FROM c;
|
||
|
|
CREATE INDEX t1abc ON t1(a,b,c);
|
||
|
|
ANALYZE;
|
||
|
|
UPDATE sqlite_stat1 SET stat='1000000 500000 500 50';
|
||
|
|
ANALYZE sqlite_master;
|
||
|
|
}
|
||
|
|
set ::sqlite_search_count 0
|
||
|
|
db eval {
|
||
|
|
SELECT d FROM t1
|
||
|
|
WHERE a=99
|
||
|
|
AND b IN (200,205,201,204)
|
||
|
|
AND c IN (304,302,309,308);
|
||
|
|
}
|
||
|
|
} {}
|
||
|
|
do_test in6-1.2 {
|
||
|
|
set ::sqlite_search_count
|
||
|
|
} {0} ;# Without the IN-early-out optimization, this value would be 15
|
||
|
|
|
||
|
|
# The multikey-IN-operator early-out optimization does not apply
|
||
|
|
# when the IN operator is on the left-most column of the index.
|
||
|
|
#
|
||
|
|
do_test in6-1.3 {
|
||
|
|
db eval {
|
||
|
|
EXPLAIN
|
||
|
|
SELECT d FROM t1
|
||
|
|
WHERE a IN (98,99,100,101)
|
||
|
|
AND b=200 AND c=300;
|
||
|
|
}
|
||
|
|
} {~/(IfNoHope|SeekHit)/}
|
||
|
|
|
||
|
|
set sqlite_search_count 0
|
||
|
|
do_execsql_test in6-1.4 {
|
||
|
|
SELECT d FROM t1
|
||
|
|
WHERE a=100
|
||
|
|
AND b IN (200,201,202,204)
|
||
|
|
AND c IN (300,302,301,305)
|
||
|
|
ORDER BY +d;
|
||
|
|
} {1 2 3 4 5 8 9}
|
||
|
|
do_test in6-1.5 {
|
||
|
|
set ::sqlite_search_count
|
||
|
|
} {39}
|
||
|
|
|
||
|
|
do_execsql_test in6-2.1 {
|
||
|
|
CREATE TABLE t2(e INT UNIQUE, f TEXT);
|
||
|
|
SELECT d, f FROM t1 LEFT JOIN t2 ON (e=d)
|
||
|
|
WHERE a=100
|
||
|
|
AND b IN (200,201,202,204)
|
||
|
|
AND c IN (300,302,301,305)
|
||
|
|
ORDER BY +d;
|
||
|
|
} {1 {} 2 {} 3 {} 4 {} 5 {} 8 {} 9 {}}
|
||
|
|
|
||
|
|
finish_test
|