Issues

• Run the sqllogictest corpus across a matrix of batch sizes

  enhancement
  apache/datafusion#26700 · Filter by author comphead opened on Oct 24, 2026
  5

• [EPIC] Custom ExecutionPlan nodes: correct results, and the same optimizations as built-in nodes

  EPIC
  apache/datafusion#26697 · Filter by author jayzhan211 opened on Oct 24, 2026

• Hash aggregate output slices keep the whole dictionary, so downstream work grows with the group count

  apache/datafusion#26696 · Filter by author jayzhan211 opened on Oct 24, 2026
  1

• Wrong results: correlated EXISTS over a groupless aggregate ignores a predicate on outer columns only

  bug
  apache/datafusion#26695 · Filter by author jayzhan211 opened on Oct 24, 2026
  1

  

• Wrong results: decorrelation loses correlated columns when a subquery contains two equal subplans

  bug
  apache/datafusion#26692 · Filter by author jayzhan211 opened on Oct 24, 2026

• TopK aggregation keeps the wrong groups when a projection computes a new column with the aggregate's name

  bug
  apache/datafusion#26691 · Filter by author jayzhan211 opened on Oct 24, 2026

• ORDER BY ... LIMIT over an OFFSET subquery returns too few rows when the table is sorted and has several files

  bug
  apache/datafusion#26690 · Filter by author jayzhan211 opened on Oct 24, 2026

• GROUPS frames and bounded rank split peers with logically equal nested dictionary nulls

  bug
  apache/datafusion#26689 · Filter by author sunchao opened on Oct 23, 2026

• Spill files are validated again on read since 55.0.0

  bugperformance
  apache/datafusion#26687 · Filter by author comphead opened on Oct 23, 2026
  1

• date_part declares a non-nullable result for non-null input, but can return NULL

  bug
  Bug

  apache/datafusion#26685 · Filter by author mbutrovich opened on Oct 23, 2026
  

• [DISCUSSION] 2026 Q4 Roadmap

  apache/datafusion#26684 · Filter by author alamb opened on Oct 23, 2026
  2

• [EPIC] Improve I/O patterns for Parquet scans

  enhancement
  Feature

  apache/datafusion#26682 · Filter by author alamb opened on Oct 23, 2026
  1

• EXTRACT(NANOSECOND) on Duration and Interval counts whole seconds twice

  bug
  Bug

  apache/datafusion#26678 · Filter by author mbutrovich opened on Oct 23, 2026
  

• [EPIC] A Collection of Wrong Results Bugs - Q4 2026

  EPIC
  apache/datafusion#26672 · Filter by author alamb opened on Oct 23, 2026
  1

• Comparing a Duration to an Interval with a days field returns wrong results (e.g. ts - ts <= INTERVAL '3 days')

  apache/datafusion#26671 · Filter by author mbutrovich opened on Oct 23, 2026

• Nested Parquet pruning reads every leaf through FixedSizeList, ListView and Dictionary wrappers

  performance
  apache/datafusion#26667 · Filter by author ranflarion opened on Oct 23, 2026

• [Substrait] Substrait consumer honours function declared output types

  bug
  Bug

  apache/datafusion#26665 · Filter by author dd-annarose opened on Oct 23, 2026
  1

  

• Review "db olympics" results

  enhancement
  Feature

  apache/datafusion#26661 · Filter by author alamb opened on Oct 23, 2026
  11

• LimitPushPastWindows only pushes a limit past the first window in a plan

  enhancementgood first issue
  apache/datafusion#26659 · Filter by author jayzhan211 opened on Oct 23, 2026
  1

  

• LimitPushPastWindows panics with "attempt to add with overflow" for a large ROWS ... FOLLOWING bound

  buggood first issue
  apache/datafusion#26658 · Filter by author jayzhan211 opened on Oct 23, 2026

• Incorrect ORDER BY results after sort pushdown through custom execution plans

  bug
  Bug

  apache/datafusion#26656 · Filter by author geoffreyclaude opened on Oct 23, 2026

• Minimum-value integer literal with postfix cast fails: SELECT -2147483648::INT errors in the optimizer

  apache/datafusion#26651 · Filter by author Shahzeb-DataEngineer opened on Oct 23, 2026

• sum() over DECIMAL silently wraps on overflow instead of erroring

  apache/datafusion#26648 · Filter by author Shahzeb-DataEngineer opened on Oct 23, 2026
  2

• Cannot execute pipeline breaking queries error prints the whole operator struct

  buggood first issue
  apache/datafusion#26645 · Filter by author jayzhan211 opened on Oct 23, 2026

• TopK dynamic filters don't prune inside recursive CTEs

  apache/datafusion#26642 · Filter by author jayzhan211 opened on Oct 23, 2026
  1