address comment

Author: jayzhan211

datafusion/optimizer/src/decorrelate_lateral_join.rs

@@ -78,6 +78,7 @@ fn rewrite_internal(join: Join) -> Result<Transformed<LogicalPlan>> {
     }
 
     match join.right.apply_with_subqueries(|p| {
+        // TODO: support outer joins
         if p.contains_outer_reference() {
             Ok(TreeNodeRecursion::Stop)
         } else {

datafusion/sqllogictest/test_files/join.slt.part

@@ -1490,6 +1490,14 @@ SELECT * FROM t0, LATERAL (SELECT * FROM t1 WHERE t1.v0 = 1);
 3 3 1 1
 4 4 1 1
 
+query IIII
+SELECT * FROM t0 JOIN LATERAL (SELECT * FROM t1 WHERE t1.v0 = 1) on true;
+----
+1 1 1 1
+1 2 1 1
+3 3 1 1
+4 4 1 1
+
 statement ok
 drop table t1;