Issues

• Native string to timestamp cast returns NULL for zone offsets with a non-zero seconds part

  requires-triage
  apache/datafusion-comet#7224 · Filter by author ninglinLiu opened on Oct 25, 2026

• Native window over a sorted cache fails with "Expects PARTITION BY expression to be ordered"

  requires-triage
  apache/datafusion-comet#7223 · Filter by author dwsmith1983 opened on Oct 25, 2026

• Native NUMERIC_OUT_OF_SUPPORTED_RANGE error surfaces as SparkException instead of SparkArithmeticException

  area:expressionsbugpriority:lowrequires-triage
  apache/datafusion-comet#7216 · Filter by author andygrove opened on Oct 25, 2026

• Native Parquet scan reads timestamp columns as string, int, double or decimal, and INT96 as bigint, where Spark rejects them

  area:scanbugpriority:lowrequires-triage
  apache/datafusion-comet#7214 · Filter by author andygrove opened on Oct 25, 2026

• Native Parquet scan read errors name no file, or every file in the task, instead of the file that failed

  area:scanbugrequires-triageuser experience
  apache/datafusion-comet#7213 · Filter by author andygrove opened on Oct 25, 2026

• Native Iceberg scan returns NULL for an INT96 column read through a name mapping when other columns are selected

  area:Icebergbugcorrectnessrequires-triage
  apache/datafusion-comet#7212 · Filter by author andygrove opened on Oct 25, 2026

• CAST(timestamp_ntz AS TIMESTAMP) fails the task for values beyond year 262143 where Spark returns a value

  bugrequires-triagetemporal expressions
  apache/datafusion-comet#7211 · Filter by author andygrove opened on Oct 25, 2026

• String-to-timestamp cast at the far-past range limit uses -08:00 instead of local mean time in America/Los_Angeles

  bugcorrectnessrequires-triagetemporal expressions
  apache/datafusion-comet#7210 · Filter by author andygrove opened on Oct 25, 2026

• Native string-to-timestamp cast rejects zone suffixes Spark accepts (PST, CET, Zulu, Etc/GMT+8, +08:00:00, no space)

  bugcorrectnessrequires-triagetemporal expressions
  apache/datafusion-comet#7209 · Filter by author andygrove opened on Oct 25, 2026

• REBALANCE followed by GROUP BY or a window returns duplicate groups on skewed data

  area:aggregationbugcorrectnessrequires-triage
  apache/datafusion-comet#7208 · Filter by author andygrove opened on Oct 25, 2026

• Native Parquet scan skips Spark's type check on a root field that loses its file column to a field-id match

  area:scanbugpriority:low
  apache/datafusion-comet#7207 · Filter by author andygrove opened on Oct 25, 2026

• Native Parquet scan returns NULL for a root column whose file column an unread field-id alias claims

  area:scanbugpriority:low
  apache/datafusion-comet#7206 · Filter by author andygrove opened on Oct 25, 2026

• [EPIC] Regressions in 1.2.0 since 1.1.0

  bugEPICrequires-triage
  apache/datafusion-comet#7204 · Filter by author andygrove opened on Oct 25, 2026 · 1.2.0
  

• collect_set over floats beside count(DISTINCT) diverges from Spark on signed zeros and NaN

  area:aggregationbugcorrectnessregressionrequires-triage
  apache/datafusion-comet#7203 · Filter by author andygrove opened on Oct 25, 2026 · 1.2.0
  1

• Native ABFS scans fail every task instead of falling back when Hadoop declines the auth type

  area:scanbugregressionrequires-triage
  apache/datafusion-comet#7202 · Filter by author andygrove opened on Oct 25, 2026 · 1.2.0
  

• fair_unified: a sort fails on its first request when consumers that cannot spill hold the task's share

  requires-triage
  apache/datafusion-comet#7197 · Filter by author dwsmith1983 opened on Oct 24, 2026

• Broadcast exchange fails with OversizedAllocationException when a string or binary column holds more than 1 GiB

  bugrequires-triage
  apache/datafusion-comet#7192 · Filter by author comphead opened on Oct 24, 2026

• Reduce duplicate right-side keys before sorting a native left-semi join

  enhancementrequires-triage
  apache/datafusion-comet#7189 · Filter by author sunchao opened on Oct 24, 2026

• Native string to decimal cast raises the wrong error under ANSI for values with more than 38 integral digits

  requires-triage
  apache/datafusion-comet#7188 · Filter by author snmvaughan opened on Oct 23, 2026

• Native string to negative-scale decimal cast doesn't match Spark 4.0.5, 4.1.4 and 4.2.1 (SPARK-60119)

  requires-triage
  apache/datafusion-comet#7187 · Filter by author snmvaughan opened on Oct 23, 2026

• CometTaskMemoryManager.releaseMemory lowers used before Spark accepts the release

  requires-triage
  apache/datafusion-comet#7176 · Filter by author dwsmith1983 opened on Oct 23, 2026

• A short grant stays with Spark when handing it back fails, but the pool records nothing

  requires-triage
  apache/datafusion-comet#7175 · Filter by author dwsmith1983 opened on Oct 23, 2026

• Concurrent unified pool try_grow calls can both ask Spark for the same overcommit

  requires-triage
  apache/datafusion-comet#7174 · Filter by author dwsmith1983 opened on Oct 23, 2026

• Bloom aggregate merge panics on batched states and ignores sliced offsets

  bugrequires-triage
  apache/datafusion-comet#7172 · Filter by author sunchao opened on Oct 23, 2026

• sequence and string to decimal cast don't match Spark 4.0.5, 4.1.4 and 4.2.1 (SPARK-58821, SPARK-60118)

  requires-triage
  apache/datafusion-comet#7170 · Filter by author snmvaughan opened on Oct 23, 2026