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Posted to github@datafusion.apache.org by "neilconway (via GitHub)" <gi...@apache.org> on 2026/04/06 00:45:49 UTC
[I] Optimize mark joins + EmptyRelation [datafusion]
neilconway opened a new issue, #21391:
URL: https://github.com/apache/datafusion/issues/21391
### Is your feature request related to a problem or challenge?
```
SELECT * FROM t1
WHERE EXISTS (SELECT 1 FROM t2 WHERE t2.id = t1.id AND 1=0)
OR t1.flag = true;
```
Yields
```
+---------------+------------------------------------------------------------+
| plan_type | plan |
+---------------+------------------------------------------------------------+
| physical_plan | ┌───────────────────────────┐ |
| | │ FilterExec │ |
| | │ -------------------- │ |
| | │ predicate: │ |
| | │ mark OR flag │ |
| | └─────────────┬─────────────┘ |
| | ┌─────────────┴─────────────┐ |
| | │ RepartitionExec │ |
| | │ -------------------- │ |
| | │ partition_count(in->out): │ |
| | │ 1 -> 16 │ |
| | │ │ |
| | │ partitioning_scheme: │ |
| | │ RoundRobinBatch(16) │ |
| | └─────────────┬─────────────┘ |
| | ┌─────────────┴─────────────┐ |
| | │ NestedLoopJoinExec │ |
| | │ -------------------- ├──────────────┐ |
| | │ join_type: RightMark │ │ |
| | └─────────────┬─────────────┘ │ |
| | ┌─────────────┴─────────────┐┌─────────────┴─────────────┐ |
| | │ EmptyExec ││ DataSourceExec │ |
| | │ ││ -------------------- │ |
| | │ ││ bytes: 264 │ |
| | │ ││ format: memory │ |
| | │ ││ rows: 1 │ |
| | └───────────────────────────┘└───────────────────────────┘ |
| | |
+---------------+------------------------------------------------------------+
```
But we could skip the entire NLJ, similar to #21321
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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Re: [I] Optimize mark joins + EmptyRelation [datafusion]
Posted by "neilconway (via GitHub)" <gi...@apache.org>.
neilconway commented on issue #21391:
URL: https://github.com/apache/datafusion/issues/21391#issuecomment-4189842212
take
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