kosiew opened a new pull request, #17286:
URL: https://github.com/apache/datafusion/pull/17286
## Which issue does this PR close?
* Closes #17280.
## Rationale for this change
The accumulator previously collected build-side partition bounds and then
**sorted** them with `sorted_by_key`, which:
* Introduced **extra allocations** and
* Added **O(n log n)** overhead on the number of completed partitions.
Since partitions already have stable IDs, we can **pre-index** bounds by
partition ID and avoid sorting entirely. This makes dynamic filter construction
**O(n)** with fewer allocations, improves predictability, and eliminates a
source of nondeterminism tied to completion order.
## What changes are included in this PR?
* Replaced `PartitionBounds` + `sorted_by_key` with a **preallocated
`Vec<Option<Vec<ColumnBounds>>>`** indexed by partition ID.
* Eliminated sorting and the dependency on `itertools`, reducing allocations
and algorithmic overhead.
* Updated accumulator logic to:
* **Bounds insertion in O(1)** at the correct index (by partition ID).
* Validate out-of-range partition IDs and return a clear internal error
instead of panicking.
* Build the dynamic filter once **all partitions have reported**, ignoring
missing partitions.
* Adjusted `create_filter_from_partition_bounds` to iterate the fixed-index
vector and construct predicates without any intermediate sorting/allocation.
* Kept/clarified determinism as a by-product: completion order no longer
affects the resulting predicate.
## Are these changes tested?
Yes.
* Added an async test `test_hashjoin_dynamic_filter_pushdown_out_of_order`
that intentionally reverses completion order of build-side partitions across
runs and asserts the resulting dynamic filter predicate string is identical,
proving order independence while validating logic.
* Existing join and dynamic filter tests continue to pass.
## Are there any user-facing changes?
No API-breaking changes.
* Internals of dynamic filter construction were optimized for efficiency and
determinism.
* Query semantics remain unchanged, but performance improves due to reduced
allocations and removal of sorting overhead.
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