Issues

• enable_window_topn returns wrong results when a projection under the filter drops a column (wrong ranking function chosen)

  apache/datafusion#26416 · Filter by author SubhamSinghal opened on Oct 16, 2026
  1

• SortExec merge lookahead can retain batches without memory reservations

  apache/datafusion#26411 · Filter by author geoffreyclaude opened on Oct 16, 2026

• Add a GroupsAccumulator for array_agg with ORDER BY

  enhancement
  apache/datafusion#26409 · Filter by author zhuqi-lucas opened on Oct 16, 2026
  

• Use zizmor to harden actions workflows

  development-process
  Feature

  apache/datafusion#26408 · Filter by author Jefffrey opened on Oct 16, 2026

• Migrate workflows away from pull_request_target

  development-process
  apache/datafusion#26406 · Filter by author Jefffrey opened on Oct 16, 2026
  1

• ProjectionPushdown fails on a nested-loop join whose lambda captures a column from the other input

  bug
  apache/datafusion#26396 · Filter by author xudong963 opened on Oct 16, 2026
  

• coerce_int96 does not coerce INT96 inside legacy Parquet list layouts (bag/array, two-level lists)

  bug
  apache/datafusion#26393 · Filter by author andygrove opened on Oct 15, 2026

• SanityCheckPlan error: a constant sort key is lost when a projection reads a duplicate alias

  apache/datafusion#26391 · Filter by author cetra3 opened on Oct 15, 2026
  1

  

• translate panics when output would exceed 2GB

  bug
  Bug

  apache/datafusion#26388 · Filter by author neilconway opened on Oct 15, 2026
  

• CrossJoinExec buffers the entire left input without spilling (OOM under memory pressure)

  apache/datafusion#26383 · Filter by author coderfender opened on Oct 15, 2026
  1

  

• PartitionedTopKExec keeps whole Utf8View input buffers alive for the rows it retains

  bug
  Bug

  apache/datafusion#26381 · Filter by author SubhamSinghal opened on Oct 15, 2026

• Substrait producer does not support LogicalPlan::Unnest

  apache/datafusion#26372 · Filter by author 1fanwang opened on Oct 15, 2026

• Extend fully ordered aggregation to temporal, decimal, and fixed-size binary keys

  apache/datafusion#26369 · Filter by author geoffreyclaude opened on Oct 15, 2026

• Window referencing a named window with an added frame, OVER (w ROWS ...), silently drops PARTITION BY and ORDER BY

  bug
  apache/datafusion#26364 · Filter by author zhuqi-lucas opened on Oct 15, 2026
  

• Piecewise merge join: semi/anti joins fail with an internal error on RunEndEncoded keys

  bug
  Bug

  apache/datafusion#26363 · Filter by author SubhamSinghal opened on Oct 15, 2026

• Validate Parquet INT96 timezone values when configuration is assigned

  apache/datafusion#26362 · Filter by author kosiew opened on Oct 15, 2026
  1

• Refactor HashJoinExec by splitting regular/existence join into dedicated streams

  enhancement
  Feature

  apache/datafusion#26361 · Filter by author 2010YOUY01 opened on Oct 15, 2026

• Physical CastExpr display hides nullability changes, so union coercion casts look like no-ops

  apache/datafusion#26358 · Filter by author zhuqi-lucas opened on Oct 15, 2026
  

• Memory limit test smj_with_mem_limit_1 is flaky

  apache/datafusion#26354 · Filter by author mzabaluev opened on Oct 15, 2026

• Optimize inner joins with a proven single constant row into Filter/Projection

  enhancement
  apache/datafusion#26349 · Filter by author xudong963 opened on Oct 15, 2026
  

• Add a GroupsAccumulator for array_agg(DISTINCT)

  enhancement
  apache/datafusion#26347 · Filter by author zhuqi-lucas opened on Oct 15, 2026
  

• Planning fails with "Conflicting types" when one placeholder is inferred with two types

  apache/datafusion#26343 · Filter by author adriangb opened on Oct 15, 2026
  2

  

• array_repeat fails for array inputs with nonnullable elements

  bug
  Bug

  apache/datafusion#26342 · Filter by author nat-openai opened on Oct 14, 2026

• [Bug] parse_url raises on a malformed URL when ANSI mode is off, Spark returns NULL

  bugspark
  apache/datafusion#26341 · Filter by author comphead opened on Oct 14, 2026

• [Bug] unbase64 rejects input that Spark's MIME decoder accepts

  bugspark
  apache/datafusion#26340 · Filter by author comphead opened on Oct 14, 2026