nuno-faria opened a new issue, #20809:
URL: https://github.com/apache/datafusion/issues/20809
### Describe the bug
When a hash join has an empty build side, the existing fast-path
optimization does not report the correct number of rows. The problem is that
the way metrics are tracked has changed but that part has not been updated.
### To Reproduce
```sql
-- this returns two rows but 0 are reported
EXPLAIN ANALYZE
WITH t1 (k) AS (
VALUES (1), (2)
), t2 (k) AS (
VALUES (1)
)
SELECT *
FROM t1
LEFT ANTI JOIN (
SELECT *
FROM t2
WHERE k <> 1
) t2 ON t1.k = t2.k;
HashJoinExec: mode=CollectLeft, join_type=RightAnti, on=[(k@0, k@0)],
metrics=[output_rows=0, ...
```
### Expected behavior
Show the correct number of rows.
### Additional context
_No response_
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