# name: test/optimizer/pushdown_set_op.test
# description: Pushdown set operations
# group: [optimizer]

statement ok
PRAGMA explain_output = 'OPTIMIZED_ONLY'


query II
explain select 42 intersect select 42;
----
logical_opt	<REGEX>:.*INTERSECT.*

# intersect is empty if either side is empty
query II
explain select 42 intersect select 42 where 1=0;
----
logical_opt	<!REGEX>:.*INTERSECT.*

query II
explain select 42 where 1=0 intersect select 42;
----
logical_opt	<!REGEX>:.*INTERSECT.*

# except is empty if LHS is empty
query II
explain select 42 where 1=0 except select 42;
----
logical_opt	<!REGEX>:.*EXCEPT.*

# if RHS is empty we can optimize away the except
query II
explain select 42 except all select 42 where 1=0;
----
logical_opt	<!REGEX>:.*EXCEPT.*

# now pushdown subquery with set ops
query II
explain select * from (select 42 intersect select 42) tbl(i) where i=42;
----
logical_opt	<REGEX>:.*INTERSECT.*

query II
explain select * from (select 42 intersect all select 43) tbl(i) where i=42;
----
logical_opt	<!REGEX>:.*INTERSECT.*

query II
explain select * from (select 43 intersect all select 42) tbl(i) where i=42;
----
logical_opt	<!REGEX>:.*INTERSECT.*

query II
explain select * from (select 42 except select 42) tbl(i) where i=42;
----
logical_opt	<REGEX>:.*EXCEPT.*

query II
explain select * from (select 42 except all select 43) tbl(i) where i=42;
----
logical_opt	<!REGEX>:.*EXCEPT.*

query II
explain select * from (select 43 except all select 42) tbl(i) where i=42;
----
logical_opt	<!REGEX>:.*EXCEPT.*

query I
select 42 intersect select 42;
----
42

query I
select 42 intersect select 42 where 1=0;
----

query I
select 42 where 1=0 intersect select 42;
----

query I
select 42 where 1=0 except select 42;
----

query I
select 42 except select 42 where 1=0;
----
42

query I
select * from (select 42 intersect select 42) tbl(i) where i=42;
----
42

query I
select * from (select 42 intersect select 43) tbl(i) where i=42;
----

query I
select * from (select 43 intersect select 42) tbl(i) where i=42;
----

query I
select * from (select 42 except select 42) tbl(i) where i=42;
----

query I
select * from (select 42 except select 43) tbl(i) where i=42;
----
42

query I
select * from (select 43 except select 42) tbl(i) where i=42;
----