Issues

• [DISCUSS] Bug bash / slow down new features while we work on bugs

  apache/datafusion#26865 · Filter by author alamb opened on Oct 28, 2026
  2

• DataFrame::from_columns should derive field nullability from the arrays

  enhancement
  Feature

  apache/datafusion#26863 · Filter by author cj-zhukov opened on Oct 28, 2026
  1

  

• DataFrame sort() order is lost by a later select() of a computed column

  apache/datafusion#26862 · Filter by author jiayuasu opened on Oct 28, 2026

• Expressions evaluated in the Parquet scan lose field metadata (extension types) of columns replaced with literals

  apache/datafusion#26855 · Filter by author cblp opened on Oct 28, 2026

• Reading Parquet with skip_metadata = true (the default) strips Arrow extension types from columns

  bug
  Bug

  apache/datafusion#26851 · Filter by author cblp opened on Oct 28, 2026

• Speed up nullable dictionary hash scattering

  apache/datafusion#26848 · Filter by author Rich-T-kid opened on Oct 28, 2026

• COUNT(DISTINCT) on Decimal32/Decimal64 doesn’t use the native distinct accumulator

  enhancement
  Feature

  apache/datafusion#26820 · Filter by author tjnangosha opened on Oct 27, 2026
  1

  

• Partial aggregate declares Unique on group keys, which lets a needed sort be removed

  bug
  apache/datafusion#26818 · Filter by author viirya opened on Oct 27, 2026

• Cache dictionary value hashes in RepartitionExec

  apache/datafusion#26814 · Filter by author Rich-T-kid opened on Oct 27, 2026
  1

  

• Reuse dictionary value hashes across final aggregation input slices

  apache/datafusion#26813 · Filter by author Rich-T-kid opened on Oct 27, 2026
  1

  

• Reuse dictionary value hashes in partial hash aggregation

  apache/datafusion#26812 · Filter by author Rich-T-kid opened on Oct 27, 2026
  1

  

• intersect_metadata_for_union() is too strict for extension types with JSON metadata serialization

  bug
  Bug

  apache/datafusion#26810 · Filter by author paleolimbot opened on Oct 27, 2026

• Push sort order into parquet scans for ungrouped MIN/MAX (same visit order as TopK)

  apache/datafusion#26809 · Filter by author GauravWaghmare opened on Oct 27, 2026

• Avoid re-evaluating build keys in array_map_key_range

  apache/datafusion#26806 · Filter by author dwsmith1983 opened on Oct 27, 2026

• Reserve computed hash join build keys before allocating the hash map

  apache/datafusion#26805 · Filter by author dwsmith1983 opened on Oct 27, 2026

• Add star and contributor thresholds to "Known Users" inclusion criteria

  apache/datafusion#26803 · Filter by author kosiew opened on Oct 27, 2026
  1

• Build the hash join hash map from the concatenated build batch

  apache/datafusion#26792 · Filter by author dwsmith1983 opened on Oct 27, 2026
  1

  

• Arrow IPC files written after a sort are many times larger than the data for Utf8View / BinaryView columns

  enhancement
  apache/datafusion#26785 · Filter by author xudong963 opened on Oct 27, 2026
  

• Fully sorted partial aggregate keeps per-batch accumulator scratch reserved after emitting completed groups (APPROX_DISTINCT)

  apache/datafusion#26781 · Filter by author viirya opened on Oct 26, 2026
  

• Reuse dictionary value hashes across repartition, aggregation, and joins

  apache/datafusion#26780 · Filter by author Rich-T-kid opened on Oct 26, 2026
  3

  

• Wrong results: a filter like k / 10 = 5 makes ORDER BY and GROUP BY treat k as constant

  bug
  Bug

  apache/datafusion#26779 · Filter by author ndscoder opened on Oct 26, 2026
  2

• Clustered aggregates don't release memory after emitting completed groups under partial group clustering

  enhancement
  Feature

  apache/datafusion#26777 · Filter by author yashaggarwal85d opened on Oct 26, 2026

• WindowAggExec and grouped TopK can exceed batch_size

  apache/datafusion#26772 · Filter by author yashrb24 opened on Oct 26, 2026

• Window ordered by (total DESC, k) fails SanityCheckPlan when k is a function of a filtered constant column

  bug
  apache/datafusion#26762 · Filter by author adriangb opened on Oct 26, 2026
  8

• Three slow tests set the length of the extended and hash-collision CI jobs

  enhancement
  apache/datafusion#26759 · Filter by author jayzhan211 opened on Oct 26, 2026
  2