pepijnve commented on PR #16398:
URL: https://github.com/apache/datafusion/pull/16398#issuecomment-2987589733
Zooming in on query 4 (it would be super convenient if these had 1-based
indices BTW to match line numbers in the file). The plan is
```
ProjectionExec: expr=[count(alias1)@0 as count(DISTINCT hits.UserID)]
AggregateExec: mode=Final, gby=[], aggr=[count(alias1)]
CoalescePartitionsExec
AggregateExec: mode=Partial, gby=[], aggr=[count(alias1)]
AggregateExec: mode=FinalPartitioned, gby=[alias1@0 as alias1],
aggr=[]
CoalesceBatchesExec: target_batch_size=8192
RepartitionExec: partitioning=Hash([alias1@0], 10),
input_partitions=10
AggregateExec: mode=Partial, gby=[UserID@0 as alias1], aggr=[]
DataSourceExec: file_groups={10 groups: ...]},
projection=[UserID], file_type=parquet
```
No redundant coop so that's good. The only element that changed in this plan
is `DataSourceExec` which contains the yielding. I'm having a hard time coming
up with a hypothesis why this would become so much slower.
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