comphead commented on code in PR #12082:
URL: https://github.com/apache/datafusion/pull/12082#discussion_r1733579129
##########
datafusion/physical-plan/src/joins/sort_merge_join.rs:
##########
@@ -1356,16 +1392,82 @@ impl SMJStream {
pre_mask.clone()
};
+ // Try to calculate if the buffered batch we scan is the
last one for specific stream row and join key
+ // for Batchsize == 1
self.buffered_data.scanning_finished() works well
+ // For other scenarios its an attempt to figure out there
is no more rows matching the same join key
+ let last_batch = if self.batch_size == 1 {
Review Comment:
Another option just came to my mind. We know in advance number of matched
rows. We can calc it as
```
let matched_indices = &self.buffered_data.batches.iter().map(|b| b.range.end
- b.range.start).count();
```
No matter how SMJ distributes data, we can just take number of
`buffered_indices.len()` per each iteration and substract it from
`matched_indices`. Once we have hit 0 means no more matched rows expected
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