Issues

• Wrong ORDER BY results after an outer join when the nullable side equates a column to coalesce/CASE

  bug
  apache/datafusion#26036 · Filter by author andygrove opened on Oct 4, 2026

• Substrait roundtrip loses pushed-down TableScan offsets and limits

  apache/datafusion#26034 · Filter by author viirya opened on Oct 4, 2026

• Correlated IN subquery fails with "Projections require unique expression names" when its column is cast

  bug
  apache/datafusion#26033 · Filter by author comphead opened on Oct 4, 2026
  

• Wrong results: a window function in an IN subquery sees every row when the correlated filter repeats the IN predicate

  bug
  apache/datafusion#26032 · Filter by author comphead opened on Oct 4, 2026
  

• Replace manual RowSelection bitmap conversion with force_mask() after arrow-rs release

  enhancement
  Feature

  apache/datafusion#26030 · Filter by author haohuaijin opened on Oct 4, 2026

• TopK dynamic filter returns wrong rows when one sort key contains another (DynamicFilterPhysicalExpr remaps the inner column first)

  apache/datafusion#26029 · Filter by author cargopete opened on Oct 4, 2026

• nvl2 result type depends on the type of its first argument

  bug
  apache/datafusion#26024 · Filter by author neilconway opened on Oct 4, 2026
  1

  

• Wrong results: correlated aggregate subquery with a lossy CAST in its filter returns one row per inner value

  bug
  apache/datafusion#26014 · Filter by author comphead opened on Oct 3, 2026
  

• CASE with two or more FixedSizeBinary WHEN literals panics

  bug
  Bug

  apache/datafusion#26012 · Filter by author fornwall opened on Oct 3, 2026

• Unparsing the random function generates invalid SQL for some dialects

  bug
  Bug

  apache/datafusion#26008 · Filter by author nuno-faria opened on Oct 3, 2026
  

• Sort-merge semi/anti/mark joins fail on timezone-aware timestamp, Dictionary, Decimal256 and Time keys: "Unsupported data type in sort merge join comparator"

  bug
  apache/datafusion#26003 · Filter by author jayzhan211 opened on Oct 3, 2026

• Sort-merge join ignores a join filter that references no columns (wrong FULL JOIN results)

  bug
  apache/datafusion#26002 · Filter by author jayzhan211 opened on Oct 3, 2026

• Sort-merge join outer join with a filter fails on NOT NULL columns: "declared as non-nullable but contains null values"

  bug
  apache/datafusion#26001 · Filter by author jayzhan211 opened on Oct 3, 2026
  1

  

• ORDER BY ... LIMIT returns wrong rows for List/Struct sort keys with NULL elements

  bug
  apache/datafusion#25998 · Filter by author jayzhan211 opened on Oct 3, 2026

• Tighten integer division interval bounds when the divisor has a zero endpoint

  enhancement
  Feature

  apache/datafusion#25995 · Filter by author haohuaijin opened on Oct 3, 2026

• Parallel Parquet writes delay reporting column-worker failures

  bug
  Bug

  apache/datafusion#25992 · Filter by author Satyr09 opened on Oct 3, 2026
  1

  

• Rewrite COUNT over non-nullable columns to COUNT(1)

  apache/datafusion#25989 · Filter by author wudidapaopao opened on Oct 3, 2026
  1

  

• testing

  apache/datafusion#25982 · Filter by author Rich-T-kid opened on Oct 2, 2026
  2

• spark: array_contains compares floats by bits, where Spark treats -0.0 as 0.0 and all NaNs as equal

  apache/datafusion#25981 · Filter by author zhangfengcdt opened on Oct 2, 2026

• Internal error: GROUP BY over UNION ALL fails when a branch projects coalesce(<nullable bool>, FALSE) (CSE rewrite is physically nullable)

  apache/datafusion#25978 · Filter by author paul-heyse opened on Oct 2, 2026

• Pre-select before cheap conjuncts when the undecided rows form a few long runs

  enhancement
  Feature

  apache/datafusion#25976 · Filter by author Abhisheklearn12 opened on Oct 2, 2026
  1

  

• Lambda examples in the SQL function docs fail with the default dialect

  apache/datafusion#25960 · Filter by author rawsun007 opened on Oct 2, 2026

• PiecewiseMergeJoin returns wrong results for List keys with NULL elements and fails on Struct keys

  bug
  Bug

  apache/datafusion#25957 · Filter by author SubhamSinghal opened on Oct 2, 2026
  1

• array_repeat fails on lists with non-nullable elements or a non-default element field name

  bug
  apache/datafusion#25950 · Filter by author neilconway opened on Oct 1, 2026
  1

  

• array_concat on nested lists panics or fails with type mismatch errors

  bug
  apache/datafusion#25948 · Filter by author neilconway opened on Oct 1, 2026