Issues

• substr on Dictionary(_, Utf8) inserts implicit CAST to Utf8View

  apache/datafusion#26170 · Filter by author Rich-T-kid opened on Oct 9, 2026
  1

  

• Improve Performance (Polars 2.0 Call to Action)

  enhancement
  Feature

  apache/datafusion#26169 · Filter by author alamb opened on Oct 9, 2026
  2

• perf: speed up hash_dictionary_scatter hot loop

  apache/datafusion#26168 · Filter by author Rich-T-kid opened on Oct 9, 2026

• RepartitionExec output coalescer buffers are not charged to any memory reservation

  apache/datafusion#26166 · Filter by author pmoust opened on Oct 9, 2026

• GroupedHashAggregateStream releases its memory reservation at emit while the output batch is still alive

  apache/datafusion#26165 · Filter by author pmoust opened on Oct 9, 2026

• Incorrect results: ORDER BY b, a over a subquery with ORDER BY b LIMIT n is not sorted by (b, a) when SortPreservingMergeExec has a fetch

  bug
  apache/datafusion#26162 · Filter by author alamb opened on Oct 9, 2026
  3

  

• Run the sqllogictest corpus under an alternative physical optimizer pipeline

  enhancement
  apache/datafusion#26152 · Filter by author zhuqi-lucas opened on Oct 9, 2026
  

• Use ProbeCompletion in NestedLoopJoinExec

  enhancementhelp wanted
  apache/datafusion#26148 · Filter by author jayzhan211 opened on Oct 9, 2026
  1

• Leaf expression pushdown leaves an unqualified column in an Aggregate's output name, so the plan fails a datafusion-proto round trip

  apache/datafusion#26144 · Filter by author clintonjrobinson opened on Oct 8, 2026

• Support releasing batches in RecordBatchMemoryCounter

  enhancementhelp wanted
  apache/datafusion#26140 · Filter by author jayzhan211 opened on Oct 8, 2026
  4

• [EPIC] Handle -0.0 (and NaN) float keys in one place instead of per call site

  enhancement
  apache/datafusion#26138 · Filter by author jayzhan211 opened on Oct 8, 2026
  3

• Reject oversized GROUPING masks during analysis

  apache/datafusion#26135 · Filter by author alexandrefimov opened on Oct 8, 2026
  2

• Execution panic for valid 64-column GROUPING SETS

  apache/datafusion#26134 · Filter by author alexandrefimov opened on Oct 8, 2026
  2

• Simplify contradictory ranges across AND/OR predicates to prune empty UNION ALL branches

  enhancement
  apache/datafusion#26131 · Filter by author xudong963 opened on Oct 8, 2026
  

• Prune files by statistics in ListingTable before building file groups

  enhancement
  apache/datafusion#26130 · Filter by author andygrove opened on Oct 7, 2026
  6

  

• [datafusion-spark] unix_millis / unix_seconds truncate toward zero instead of flooring for pre-epoch timestamps

  bug
  Bug

  apache/datafusion#26128 · Filter by author harsh-ande opened on Oct 7, 2026
  1

  

• Explore proactive flushing for Partial hash aggregation

  enhancement
  apache/datafusion#26124 · Filter by author Rachelint opened on Oct 7, 2026
  

• SortMergeJoin misses rows for nested float keys containing -0.0

  bug
  apache/datafusion#26115 · Filter by author jayzhan211 opened on Oct 7, 2026

• preserve ordering through to_timestamp_seconds/millis/micros/nanos and to_unixtime

  enhancement
  Feature

  apache/datafusion#26108 · Filter by author haohuaijin opened on Oct 7, 2026
  1

  

• JoinSelection should skip HashJoinExec nodes that already carry a dynamic filter instead of failing in swap_inputs

  bug
  apache/datafusion#26106 · Filter by author zhuqi-lucas opened on Oct 7, 2026
  4

  

• Parquet schema inference marks a column NOT NULL when it is missing from some files, making the table unreadable

  bug
  apache/datafusion#26103 · Filter by author zhuqi-lucas opened on Oct 7, 2026
  

• Account for retained sort-key capacity

  apache/datafusion#26099 · Filter by author kosiew opened on Oct 7, 2026
  1

• feat: Treat all NaNs as the same value (-NaN = NaN)

  enhancement
  Feature

  apache/datafusion#26091 · Filter by author mkleen opened on Oct 6, 2026
  2

  

• Build multi-column null-aware NOT IN on the subquery side (multi-key null-aware RightAnti)

  enhancement
  apache/datafusion#26089 · Filter by author viirya opened on Oct 6, 2026
  1

• Narrow multi-column NOT IN UNKNOWN checks by treating NOT NULL tuple elements as scope keys

  enhancement
  apache/datafusion#26088 · Filter by author viirya opened on Oct 6, 2026
  1