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[DISCUSSION] 2026 Q3-Q4 Roadmap Discussion
#22882 · alamb opened on Jun 10, 2026
9

Aliased aggregate functions fail in sliding window frames
apache/datafusion#26466 · opened on Oct 18, 2026
2
coerce_int96 leaves INT96 in two-level and legacy Parquet lists as nanoseconds
apache/datafusion#26463 · opened on Oct 18, 2026
ORDER BY on a source column fails when a select item is aliased to that column's name
apache/datafusion#26462 · opened on Oct 18, 2026
Physical plan check does not cover appended optimizer rules and does not name the rule that broke the plan
apache/datafusion#26460 · opened on Oct 18, 2026
Scans of tables with a declared ordering use count-based file groups, so uneven files make them up to 3x slower
apache/datafusion#26457 · opened on Oct 18, 2026
Wrong results: UNION ALL ... ORDER BY ... LIMIT when a sort key is constant per arm (partitioned TopK shares a threshold over a shortened key)
Bug
apache/datafusion#26454 · opened on Oct 17, 2026
Incorrect Parquet pruning for timestamp-to-time casts across midnight
Bug
apache/datafusion#26451 · opened on Oct 17, 2026
1
Avoid aggregate repartitioning for audited date_trunc on single-key timestamp ranges
apache/datafusion#26448 · opened on Oct 17, 2026
DiskManager in Directories mode creates its temp directories when it is built, even if nothing spills
apache/datafusion#26446 · opened on Oct 17, 2026
TopK aggregation duplicates NaN groups and can panic during eviction
apache/datafusion#26444 · opened on Oct 17, 2026
array_agg(DISTINCT x ORDER BY x) returns values in reverse order when another aggregate orders by x DESC
apache/datafusion#26439 · opened on Oct 17, 2026
ORDER BY ... LIMIT 0 panics in TopK (assertion failed: k > 0) when eliminate_limit does not run
Bug
apache/datafusion#26431 · opened on Oct 16, 2026
SanityCheckPlan error when sorting by a function of a product above a projection with a computed column
apache/datafusion#26430 · opened on Oct 16, 2026
1
Report the ordering and partitioning of MATERIALIZED CTE scans by optimizing each CTE body first
apache/datafusion#26424 · opened on Oct 16, 2026
enable_window_topn returns wrong results when a projection under the filter drops a column (wrong ranking function chosen)
apache/datafusion#26416 · opened on Oct 16, 2026
1
SortExec merge lookahead can retain batches without memory reservations
apache/datafusion#26411 · opened on Oct 16, 2026
Add a GroupsAccumulator for array_agg with ORDER BY
apache/datafusion#26409 · opened on Oct 16, 2026
Use zizmor to harden actions workflows
Feature
apache/datafusion#26408 · opened on Oct 16, 2026
Migrate workflows away from pull_request_target
apache/datafusion#26406 · opened on Oct 16, 2026
1
ProjectionPushdown fails on a nested-loop join whose lambda captures a column from the other input
apache/datafusion#26396 · opened on Oct 16, 2026
coerce_int96 does not coerce INT96 inside legacy Parquet list layouts (bag/array, two-level lists)
apache/datafusion#26393 · opened on Oct 15, 2026
SanityCheckPlan error: a constant sort key is lost when a projection reads a duplicate alias
apache/datafusion#26391 · opened on Oct 15, 2026
1
translate panics when output would exceed 2GB
Bug
apache/datafusion#26388 · opened on Oct 15, 2026
CrossJoinExec buffers the entire left input without spilling (OOM under memory pressure)
apache/datafusion#26383 · opened on Oct 15, 2026
1
PartitionedTopKExec keeps whole Utf8View input buffers alive for the rows it retains
Bug
apache/datafusion#26381 · opened on Oct 15, 2026