should be it

external/duckdb/test/optimizer/pushdown/issue_18653.test

@@ -0,0 +1,58 @@
+# name: test/optimizer/pushdown/issue_18653.test
+# description: Performance issue with CROSS JOIN and LATERAL JOIN combined with unnest and json_each. Filter should be pushed down to reduce the joined rows
+# group: [pushdown]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+create table test_table as
+select s.i as id,  [1, 2, 3]::bigint[] as values from generate_series(1, 1000000) as s(i);
+
+statement ok
+create index test_table_id_idx on test_table(id);
+
+query II
+explain analyze
+select id, value
+from test_table
+cross join unnest(values) as values(value) where id = 87100;
+----
+analyzed_plan	<REGEX>:.*LEFT_DELIM_JOIN.*FILTER.*
+
+query II
+select id, value
+from test_table
+cross join unnest(values) as values(value) where id = 87100;
+----
+87100	3
+87100	2
+87100	1
+
+query II
+explain analyze
+select id, value
+from test_table t
+left join lateral unnest(t.values) as value on true
+where id = 87100;
+----
+analyzed_plan	<REGEX>:.*LEFT_DELIM_JOIN.*FILTER.*
+
+require json
+
+statement ok
+create table test_table2 as
+select s.i as id, '{"key1": 1, "key2": 2, "key3": 3}'::JSON as values
+from generate_series(1, 1000000) as s(i);
+
+statement ok
+create index test_table2_id_idx on test_table2(id);
+
+query II
+explain analyze
+select t.id, key, value
+from test_table2 t
+cross join json_each(t.values) as kv(key, value)
+where t.id = 87100;
+----
+analyzed_plan	<REGEX>:.*LEFT_DELIM_JOIN.*Filters:.*id=87100.*