Issues

• Prune unused dictionary values before spilling to Arrow IPC

  enhancement
  Feature

  apache/datafusion#27014 · Filter by author brancz opened on Nov 2, 2026

• add udaf_return_field_preserving_arg_metadata

  apache/datafusion#27013 · Filter by author sdf-jkl opened on Nov 2, 2026
  2

• map_entries() panics on a valid map with non-nullable values

  apache/datafusion#27012 · Filter by author sesteves opened on Nov 2, 2026

• variant_get on a shredded Variant column reads the whole column; get_field on the same data as a struct reads one leaf

  apache/datafusion#27007 · Filter by author raghuvanshraj opened on Nov 2, 2026
  1

• proto-common: decoding a malformed scalar, union type or CSV options panics instead of erroring

  apache/datafusion#27004 · Filter by author geoHeil opened on Nov 2, 2026

• SortPreservingMergeExec reads inputs one at a time when their key ranges are disjoint

  apache/datafusion#27003 · Filter by author zhuqi-lucas opened on Nov 2, 2026
  

• simplify_expressions: A * 0 drops the multiplication result type, so a range predicate over it fails to plan

  apache/datafusion#27001 · Filter by author ayushan003 opened on Nov 2, 2026

• physical-plan: decoding an Unnest or Explain node with an unset field panics

  apache/datafusion#26999 · Filter by author geoHeil opened on Nov 1, 2026
  1

• datafusion-proto: decoding an AvroScan node without the avro feature panics

  apache/datafusion#26998 · Filter by author geoHeil opened on Nov 1, 2026

• information_schema.views.defintion contains DDL statement

  bug
  Bug

  apache/datafusion#26997 · Filter by author pepijnve opened on Nov 1, 2026
  2

  

• Fuzz failure

  bug
  Bug

  apache/datafusion#26990 · Filter by author alamb opened on Nov 1, 2026
  3

  

• approx_distinct rejects floats, but accepts containers of them

  bug
  Bug

  apache/datafusion#26985 · Filter by author mkleen opened on Nov 1, 2026

• Parquet pruning drops rows for CAST(int AS BOOLEAN) and CAST(int AS BYTEA) predicates

  bug
  apache/datafusion#26981 · Filter by author jayzhan211 opened on Nov 1, 2026

• Partitioned hash join keeps its hash maps allocated but unreserved after it finishes (dynamic filter pushdown)

  apache/datafusion#26980 · Filter by author jayzhan211 opened on Nov 1, 2026
  2

  

• Avoid per-row dictionary casts for binary Parquet columns

  apache/datafusion#26976 · Filter by author Rich-T-kid opened on Oct 31, 2026

• Avoid dictionary promotion for Parquet plain fallback pages

  apache/datafusion#26972 · Filter by author Rich-T-kid opened on Oct 31, 2026

• collect_set returns both 0.0 and -0.0

  apache/datafusion#26965 · Filter by author mkleen opened on Oct 31, 2026
  4

  

• BoundedWindowAggExec can emit batches larger than batch_size

  bug
  apache/datafusion#26959 · Filter by author comphead opened on Oct 30, 2026

• ceil and floor panic on a decimal scalar when number_rows is 0

  buggood first issue
  Bug

  apache/datafusion#26950 · Filter by author mbutrovich opened on Oct 30, 2026
  1

  

• lpad and rpad panic or abort on a negative or very large length in an array of lengths

  buggood first issue
  Bug

  apache/datafusion#26949 · Filter by author mbutrovich opened on Oct 30, 2026
  1

  

• repeat on LargeUtf8 aborts the process on a result size no allocation can satisfy

  buggood first issue
  Bug

  apache/datafusion#26948 · Filter by author mbutrovich opened on Oct 30, 2026
  1

  

• Preserve short IN lists for dictionary string columns

  apache/datafusion#26945 · Filter by author Rich-T-kid opened on Oct 30, 2026
  1

  

• Multi-column sort fails with ResourcesExhausted instead of spilling when the sort keys are most of each row

  bug
  apache/datafusion#26940 · Filter by author comphead opened on Oct 30, 2026

• GenericDistinctBuffer::size() underreports retained HashSet memory

  bug
  Bug

  apache/datafusion#26937 · Filter by author Nook001 opened on Oct 30, 2026

• Support the Parquet ALP encoding in the parquet writer options (format.encoding / datafusion.execution.parquet.encoding)

  enhancementgood first issue
  apache/datafusion#26936 · Filter by author alamb opened on Oct 30, 2026
  2