Dandandan commented on code in PR #4411:
URL: https://github.com/apache/arrow-datafusion/pull/4411#discussion_r1034367238
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datafusion/optimizer/src/limit_push_down.rs:
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@@ -192,6 +196,18 @@ impl OptimizerRule for LimitPushDown {
LogicalPlan::Join(join) => {
let limit = fetch + skip;
let new_join = match join.join_type {
+ JoinType::Left | JoinType::Right | JoinType::Full
+ if is_no_join_condition(join) =>
+ {
+ // push left and right
+ push_down_join(join, Some(limit), Some(limit))
+ }
+ JoinType::LeftSemi | JoinType::LeftAnti
+ if is_no_join_condition(join) =>
+ {
+ // push left
+ push_down_join(join, Some(limit), None)
+ }
JoinType::Left => push_down_join(join, Some(limit), None),
JoinType::Right => push_down_join(join, None, Some(limit)),
Review Comment:
I think those are the lesser restrictive versions of push down (only to
left/right side)
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