Light-City commented on code in PR #41122:
URL: https://github.com/apache/arrow/pull/41122#discussion_r1559640025
##########
cpp/src/arrow/acero/swiss_join.cc:
##########
@@ -2160,6 +2160,9 @@ Status JoinResidualFilter::FilterOneBatch(const
ExecBatch& keypayload_batch,
bool output_key_ids, bool
output_payload_ids,
arrow::util::TempVectorStack*
temp_stack,
int* num_passing_rows) const {
+ if (num_batch_rows == 0) {
Review Comment:
detail case:
```
gpadmin=# select * from stu;
id | name | age
----+------+-----
2 | hack | 28
(1 row)
gpadmin=# select * from score;
id | stu_id | subject | score
----+--------+---------+-------
1 | 10 | Jack | 95
2 | 10 | Jack | 98
3 | 12 | math | 97
4 | 15 | TOM | 92
(4 rows)
```
SELECT * FROM stu st WHERE NOT EXISTS (SELECT stu_id FROM score
where score.stu_id = st.id and st.age>25);
FilterLeftSemi will got **num_batch_rows=0**
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