Issues

• [Variant] Support untyped children in shredding target schemas

  apache/arrow-rs#12078 · Filter by author sdf-jkl opened on Nov 4, 2026

• SerializedFileWriter retains ~300 bytes per column per row group for absent bloom filters and page indexes

  apache/arrow-rs#12072 · Filter by author rabenhorst opened on Nov 4, 2026

• Avoid collecting the whole schema per dictionary batch when reading IPC streams

  apache/arrow-rs#12069 · Filter by author asubiotto opened on Nov 4, 2026
  

• Optimize dictionary interleave when values mappings are shared

  enhancement
  apache/arrow-rs#12056 · Filter by author Rich-T-kid opened on Nov 3, 2026
  1

  

• Optimize gather_dictionary_values in arrow-row

  enhancement
  apache/arrow-rs#12053 · Filter by author Rich-T-kid opened on Nov 3, 2026

• Casting Float64 / Float32 to decimal is wrong once the scaled value reaches 2^53 (295161.0 at scale 15 becomes 295160.999999999967232)

  apache/arrow-rs#12048 · Filter by author akupchinskiy opened on Nov 3, 2026
  2

• Parquet reader: option to replace invalid UTF-8 instead of failing

  enhancement
  Feature

  apache/arrow-rs#12047 · Filter by author antonireus opened on Nov 3, 2026
  4

• Parquet reader: expanding dictionary encoded strings into StringArray/BinaryArray is slow for short values

  enhancement
  apache/arrow-rs#12045 · Filter by author viirya opened on Nov 3, 2026
  1

• Define policy for backporting security fixes

  development-process
  apache/arrow-rs#12032 · Filter by author Jefffrey opened on Nov 2, 2026
  2

• arrow-ipc: a sender-declared uncompressed length sizes an up-front allocation, aborting on i64::MAX

  apache/arrow-rs#12030 · Filter by author geoHeil opened on Nov 2, 2026

• Deprecate infallible fixed-width row decoders

  apache/arrow-rs#12026 · Filter by author Rich-T-kid opened on Nov 2, 2026

• BooleanBufferBuilder::append_slice sets one bit at a time, making it a bottleneck when reading Parquet BOOLEAN columns

  enhancement
  apache/arrow-rs#12023 · Filter by author viirya opened on Nov 1, 2026

• Faster list offset and validity building in the Parquet ListArrayReader

  apache/arrow-rs#12017 · Filter by author dwsmith1983 opened on Nov 1, 2026

• Rewrite the Flight example certificate generation script

  apache/arrow-rs#12009 · Filter by author Phoenix500526 opened on Oct 31, 2026
  1

• mul of an interval by a Float64 adds the day fractions in a different order than DuckDB's INTERVAL * DOUBLE

  bug
  apache/arrow-rs#12004 · Filter by author mbutrovich opened on Oct 30, 2026
  2

• binary_mut and try_binary_mut return Ok for an empty array whose buffer is shared

  apache/arrow-rs#12002 · Filter by author mbutrovich opened on Oct 30, 2026

• Is a filter predicate shorter than the array meant to be supported?

  documentation
  apache/arrow-rs#12001 · Filter by author mbutrovich opened on Oct 30, 2026
  2

• [Parquet] ALP expands high-entropy float columns instead of compressing them, with no raw fallback

  apache/arrow-rs#11985 · Filter by author Abdallah-Afifi opened on Oct 29, 2026
  3

• FilterPredicate may compute the mask that is not used by downstream filtering

  enhancement
  Feature

  apache/arrow-rs#11983 · Filter by author mzabaluev opened on Oct 29, 2026

• arrow-avro: schema resolution ignores the enclosing namespace when comparing record, enum and fixed names

  apache/arrow-rs#11960 · Filter by author linliu-code opened on Oct 28, 2026
  1

• arrow-avro: schema resolution maps by-name union branches to the first reader branch, misaligning the decode

  apache/arrow-rs#11958 · Filter by author linliu-code opened on Oct 28, 2026

• Remove standalone APIs deprecated before the last three major releases

  api-change
  apache/arrow-rs#11956 · Filter by author Rich-T-kid opened on Oct 28, 2026

• parquet: decode_metadata reserves memory from unvalidated footer counts (row groups, num_children)

  bug
  Bug

  apache/arrow-rs#11954 · Filter by author kandarpck opened on Oct 28, 2026
  2

  

• [Variant] Infer a shredding schema from sampled values

  enhancement
  apache/arrow-rs#11951 · Filter by author sdf-jkl opened on Oct 27, 2026

• [Variant] Configure explicit shredding when writing Parquet

  enhancement
  apache/arrow-rs#11950 · Filter by author sdf-jkl opened on Oct 27, 2026