# name: test/issues/general/test_4950.test
# description: Issue 4950: Subquery is not transformed into an anti-join by the optimizer
# group: [general]

statement ok
pragma explain_output = optimized_only

statement ok
pragma enable_verification

statement ok
create table lineitem (l_orderkey int, l_suppkey int, l_partkey int);

statement ok
insert into lineitem values (1,1,42),(1,2,43),(3,3,44),(4,5,45),(5,5,46),(6,5,47);

query III rowsort
select * from lineitem l1 where exists (
    select * from lineitem l2
    where
        l2.l_orderkey = l1.l_orderkey
        and l2.l_suppkey <> l1.l_suppkey
);
----
1	1	42
1	2	43

# deliminator should remove INNER
query II
explain select * from lineitem l1 where exists (
    select * from lineitem l2
    where
        l2.l_orderkey = l1.l_orderkey
        and l2.l_suppkey <> l1.l_suppkey
);
----
logical_opt	<!REGEX>:.*INNER.*

# SINGLE join - same story
query III
select * from lineitem l1 where (
    select l_orderkey from lineitem l2
    where
        l2.l_orderkey = l1.l_orderkey
        and l2.l_suppkey <> l1.l_suppkey
);
----
1	1	42
1	2	43

query II
explain select * from lineitem l1 where (
    select l_orderkey from lineitem l2
    where
        l2.l_orderkey = l1.l_orderkey
        and l2.l_suppkey <> l1.l_suppkey
);
----
logical_opt	<!REGEX>:.*INNER.*

# operations on the columns - we can't do the optimization here,
# but with enable_verification we check the results are the same with/without optimizer
query I
select count(*) from lineitem l1 where exists (
     select * from lineitem l2
     where
         l2.l_orderkey = l1.l_orderkey + 1
         and l2.l_suppkey <> l1.l_suppkey + 1
);
----
3

# more correlated columns
query I
select count(*) from lineitem l1 where exists (
     select * from (SELECT l2.l_orderkey AS l_orderkey, l2.l_suppkey + l1.l_suppkey AS l_suppkey FROM lineitem l2) AS l3
     where
         l3.l_orderkey = l1.l_orderkey
         and l3.l_suppkey <> l1.l_suppkey
);
----
6

# more correlated columns + operations
query I
select count(*) from lineitem l1 where exists (
     select * from (SELECT l2.l_orderkey AS l_orderkey, l2.l_suppkey + l1.l_suppkey AS l_suppkey FROM lineitem l2) AS l3
     where
         l3.l_orderkey = l1.l_orderkey + 1
         and l3.l_suppkey <> l1.l_suppkey + 1
);
----
3

# select other columns + operations
query I
select count(*) from lineitem l1 where exists (
     select l_partkey from lineitem l2
     where
         l2.l_orderkey = l1.l_orderkey + 1
         and l2.l_suppkey <> l1.l_suppkey + 1
);
----
3

# select other columns, but no operations (we can perform the optimization here!
query I
select count(*) from lineitem l1 where exists (
     select l_partkey from lineitem l2
     where
         l2.l_orderkey = l1.l_orderkey
         and l2.l_suppkey <> l1.l_suppkey
);
----
2

query II
explain select count(*) from lineitem l1 where exists (
     select l_partkey from lineitem l2
     where
         l2.l_orderkey = l1.l_orderkey
         and l2.l_suppkey <> l1.l_suppkey
);
----
logical_opt	<!REGEX>:.*INNER.*

# aggregate within the subquery
query I
select count(*) from lineitem l1 where exists (
     select sum(l2.l_orderkey) from lineitem l2
     where
         l2.l_orderkey = l1.l_orderkey + 1
         and l2.l_suppkey <> l1.l_suppkey + 1
);
----
6