adriangb commented on code in PR #15769:
URL: https://github.com/apache/datafusion/pull/15769#discussion_r2074207291
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datafusion/physical-optimizer/src/optimizer.rs:
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@@ -95,6 +95,10 @@ impl PhysicalOptimizer {
// as that rule may inject other operations in between the
different AggregateExecs.
// Applying the rule early means only directly-connected
AggregateExecs must be examined.
Arc::new(LimitedDistinctAggregation::new()),
+ // The FilterPushdown rule tries to push down filters as far as it
can.
+ // For example, it will push down filtering from a `FilterExec` to
+ // a `DataSourceExec`, or from a `TopK`'s current state to a
`DataSourceExec`.
+ Arc::new(FilterPushdown::new()),
Review Comment:
@alamb this is actually an issue, moving this does not work alongside
https://github.com/apache/datafusion/pull/15770:
- `SortExec`s filter has to be pushed down after any manipulation of the
`SortExec`s in the plan (otherwise it will be referencing a `SortExec` that
gets removed / replaced and not function)
- `EnforceSorting` creates new `SortExec`s, so `FilterPushdown` would have
to come after that
- The extra `RepartitionExec`s get introduced in `EnforceDistribution`
- Since `EnforceSorting` must come after `EnforceDistribution` there is no
correct place to put `FilterPushdown`
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