1.2.0

Issues

• Sort-aware Iceberg reads: per-partition streaming merge + report ordering and grouping (v1)

  area:scanenhancement
  apache/datafusion-comet#5337 · Filter by author parthchandra opened on Aug 12, 2026 · 1.2.0
  

• NegativeExpr::get_properties reports child ordering and range unchanged

  area:expressionsbugpriority:medium
  apache/datafusion-comet#5330 · Filter by author Smallfu666 opened on Aug 11, 2026 · 1.2.0
  1

  

• size, arrays_zip, map_from_arrays and array_append return wrong answers for a nondeterministic child

  area:expressionsarray expressionsbugcorrectnessmap expressionspriority:critical
  apache/datafusion-comet#5781 · Filter by author andygrove opened on Sep 8, 2026 · 1.2.0
  4

  

• Write blog post for 1.1.0 release

  enhancement
  apache/datafusion-comet#6120 · Filter by author andygrove opened on Sep 22, 2026 · 1.2.0

• Comet 1.2.0 Release

  enhancement
  apache/datafusion-comet#6550 · Filter by author andygrove opened on Oct 2, 2026 · 1.2.0
  2

  

• My priorities for 1.2.0

  enhancement
  apache/datafusion-comet#6580 · Filter by author andygrove opened on Oct 3, 2026 · 1.2.0
  

• Native map construction doesn't match Spark 4.0+ float key normalization (-0.0 keys, missing DUPLICATED_MAP_KEY)

  area:expressionsbugpriority:critical
  apache/datafusion-comet#6549 · Filter by author andygrove opened on Oct 2, 2026 · 1.2.0
  

• Enable spark.comet.exec.localTableScan.enabled when running Spark SQL tests

  priority:lowspark sql tests
  apache/datafusion-comet#4347 · Filter by author mbutrovich opened on May 15, 2026 · 1.2.0
  1

• feat(iceberg): native Iceberg scans of HDFS-backed tables via iceberg-rust's hdfs-native backend

  area:Icebergarea:scanarea:shufflearea:writerenhancement
  Unread
  apache/datafusion-comet#5898·mixermt opened Sep 13, 2026 · Updated Oct 28, 2026
  15

• Write blog post for 1.2.0 release

  enhancement
  apache/datafusion-comet#6889 · Filter by author andygrove opened on Oct 12, 2026 · 1.2.0
  2

• Native Iceberg scan returns wrong values for a column renamed after a VERSION AS OF snapshot

  area:Icebergarea:scanbugcorrectnesspriority:critical
  apache/datafusion-comet#6822 · Filter by author andygrove opened on Oct 9, 2026 · 1.2.0
  2

  

• Native Iceberg scan returns nested values that Spark reads as NULL in files without field ids or a name mapping

  area:Icebergarea:scanbugcorrectnesspriority:critical
  apache/datafusion-comet#6794 · Filter by author andygrove opened on Oct 8, 2026 · 1.2.0
  3

  

• Native Iceberg scan returns NULL for nested fields of migrated tables that use a name mapping

  area:Icebergarea:scanbugcorrectnesspriority:critical
  apache/datafusion-comet#6790 · Filter by author andygrove opened on Oct 8, 2026 · 1.2.0
  2

  

• [Bug] Native make_interval overflows valid time components or loses seconds precision

  area:expressionsbugpriority:medium
  apache/datafusion-comet#5131 · Filter by author peterxcli opened on Jul 29, 2026 · 1.2.0
  

• Register CometArrowAllocator as a Spark MemoryConsumer for JVM-UDF dispatch

  area:expressionsarea:ffipriority:medium
  apache/datafusion-comet#4174 · Filter by author andygrove opened on May 1, 2026 · 1.2.0
  1

  

• [Bug] map_from_arrays / map_from_entries do not enforce null-key rejection or spark.sql.mapKeyDedupPolicy

  area:expressionsbugcorrectnesspriority:medium
  apache/datafusion-comet#4680 · Filter by author andygrove opened on Jun 18, 2026 · 1.2.0
  3

  

• Drop support for Spark 3.4

  enhancementpriority:low
  apache/datafusion-comet#4329 · Filter by author andygrove opened on May 14, 2026 · 1.2.0
  3

• Native Iceberg writes do not use shuffle direct read for their input

  area:Icebergarea:shufflearea:writerenhancementperformance
  apache/datafusion-comet#6913 · Filter by author andygrove opened on Oct 12, 2026 · 1.2.0
  

• feat: bump iceberg-rust past apache/iceberg-rust#3255 and narrow the nested schema evolution fallback

  area:Icebergarea:scanarea:writerenhancement
  Unread
  apache/datafusion-comet#7028·andygrove opened Oct 15, 2026 · Updated Oct 27, 2026
  10

• fix: write the Spark version into the footer of natively written Parquet files

  area:writerbug
  Unread
  apache/datafusion-comet#7053·andygrove opened Oct 16, 2026 · Updated Oct 23, 2026
  15

• Share Parquet footer and page index metadata across tasks in an executor

  area:scanenhancementperformance
  apache/datafusion-comet#4994 · Filter by author andygrove opened on Jul 21, 2026 · 1.2.0
  1

  

• perf: native Parquet scans fetch each file and row group only after the previous one is decoded

  area:scanenhancementperformance
  apache/datafusion-comet#7093 · Filter by author andygrove opened on Oct 17, 2026 · 1.2.0
  1

  

• docs: publish the newest release at user-guide/latest and main at user-guide/dev

  area:Deltaarea:expressionsarea:Icebergarea:scandocumentation
  Unread
  apache/datafusion-comet#7112·andygrove opened Oct 19, 2026 · Updated Oct 22, 2026·Draft
  16