# name: test/sql/function/numeric/test_random.test
# description: Test random & setseed functions
# group: [numeric]

# we need to be a bit more clever here for testing random
# it's very unlikely that three random variables are exactly equivalent

# test random in lambdas and ranges
statement ok
CREATE TABLE t1 AS SELECT [random() for a IN range(1)] FROM range(2);

statement ok
CREATE TABLE t2 AS SELECT random() FROM range(2);

statement ok
CREATE TABLE t3 AS SELECT [random()] FROM range(2);

statement ok
CREATE TABLE t4 AS SELECT [random() + range * 0 for a IN range(1)]  FROM range(2);

query I
SELECT count(*) FROM t1 WHERE (SELECT min(#1) FROM t1 ) == (SELECT max(#1) FROM t1);
----
0

query I
SELECT count(*) FROM t2 WHERE (SELECT min(#1) FROM t2 ) == (SELECT max(#1) FROM t2);
----
0

query I
SELECT count(*) FROM t3 WHERE (SELECT min(#1) FROM t3 ) == (SELECT max(#1) FROM t3);
----
0

query I
SELECT count(*) FROM t4 WHERE (SELECT min(#1) FROM t4 ) == (SELECT max(#1) FROM t4);
----
0

require skip_reload

statement ok
BEGIN TRANSACTION

statement ok
CREATE TEMPORARY TABLE t1 AS SELECT RANDOM() a;

statement ok
CREATE TEMPORARY TABLE t2 AS SELECT RANDOM() b;

statement ok
CREATE TEMPORARY TABLE t3 AS SELECT RANDOM() c;

# empty result on this join
query I
SELECT COUNT(*) FROM (SELECT a FROM t1 JOIN t2 ON (a=b) JOIN t3 ON (b=c)) s1
----
0

statement ok
ROLLBACK

# with setseed we can enforce the equivalence of these values
statement ok
select setseed(0.1)

statement ok
CREATE TEMPORARY TABLE t1 AS SELECT RANDOM() a;

statement ok
select setseed(0.1)

statement ok
CREATE TEMPORARY TABLE t2 AS SELECT RANDOM() b;

statement ok
select setseed(0.1)

statement ok
CREATE TEMPORARY TABLE t3 AS SELECT RANDOM() c;

# now the join has one value
query I
SELECT COUNT(*) FROM (SELECT a FROM t1 JOIN t2 ON (a=b) JOIN t3 ON (b=c)) s1
----
1

# incorrect usage of setseed
statement error
select setseed(1.1)
----

statement error
select setseed(-1.1)
----

# we can use setseed with a table as well
statement ok
CREATE TABLE seeds(a DOUBLE)

statement ok
INSERT INTO seeds VALUES (-0.1), (0.0), (0.1)

query IR
select setseed(a), a from seeds;
----
NULL	-0.100000
NULL	0.000000
NULL	0.100000

# use random in some complicated expressions
statement ok
CREATE TABLE numbers(a INTEGER)

statement ok
INSERT INTO numbers VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10)

query I
select case when min(random()) >= 0 then 1 else 0 end from numbers;
----
1

query I
select case when max(random()) < 1 then 1 else 0 end from numbers;
----
1

# we can order by random
statement ok
select * from numbers order by random()

# we can select random
statement ok
select random() from numbers