mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-12-17 01:21:29 +00:00
51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
# 2017-02-15
|
|
#
|
|
# 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.
|
|
#
|
|
#***********************************************************************
|
|
#
|
|
# Test cases to show that a join involving an empty table is very fast.
|
|
#
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
|
|
# Build some test data
|
|
#
|
|
do_execsql_test emptytable-100 {
|
|
CREATE TABLE t1(a);
|
|
WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)
|
|
INSERT INTO t1(a) SELECT x FROM c;
|
|
CREATE TABLE empty(x);
|
|
SELECT count(*) FROM t1;
|
|
} {100}
|
|
|
|
# Interrupt queries after 1M cycles to prevent burning excess CPU
|
|
proc stopDb {args} {
|
|
db interrupt
|
|
}
|
|
db progress 1000000 {stopDb}
|
|
|
|
# Prior to the query planner optimization on 2017-02-15, this query would
|
|
# take a ridiculous amount of time. If that optimization stops working,
|
|
# the result here will be in interrupt for running too long.
|
|
#
|
|
do_catchsql_test emptytable-110 {
|
|
SELECT count(*) FROM t1, t1, t1, t1, t1, t1, empty;
|
|
} {0 0}
|
|
|
|
do_catchsql_test emptytable-120 {
|
|
SELECT count(*) FROM t1, t1 LEFT JOIN empty;
|
|
} {0 10000}
|
|
do_catchsql_test emptytable-121 {
|
|
SELECT count(*) FROM t1, t1 LEFT JOIN t1, empty;
|
|
} {0 0}
|
|
|
|
|
|
finish_test
|