Issues

• Native execution fails with offset overflow when a large scalar string is expanded to the batch length

  area:aggregationarea:expressionsarea:shufflebugpriority:highrequires-triage
  apache/datafusion-comet#7247 · Filter by author andygrove opened on Oct 26, 2026

• Native OR, AND, IN, concat, NULL operands and later top-K sort keys evaluate operands Spark skips, raising ANSI errors

  area:expressionsbugpriority:mediumrequires-triage
  apache/datafusion-comet#7246 · Filter by author andygrove opened on Oct 26, 2026

• Native lpad and rpad fail when the string argument evaluates to a scalar, such as a scalar subquery inside IF

  area:expressionsbugpriority:mediumrequires-triage
  apache/datafusion-comet#7245 · Filter by author andygrove opened on Oct 26, 2026

• Native memory requests treat an error from Spark as a refusal

  requires-triage
  apache/datafusion-comet#7244 · Filter by author dwsmith1983 opened on Oct 26, 2026

• feat: Give each native Text and CSV scan task only its own file group (use plan-data injection)

  bugperformance
  apache/datafusion-comet#7243 · Filter by author parthchandra opened on Oct 26, 2026
  

• Native Iceberg writer records NaN as a manifest lower/upper bound for all-NaN float and double columns on Parquet 60

  area:Icebergarea:writerbugpriority:medium
  apache/datafusion-comet#7242 · Filter by author andygrove opened on Oct 26, 2026
  

• Move the version checks for Spark patch-release fixes into SparkFixes

  requires-triage
  apache/datafusion-comet#7241 · Filter by author snmvaughan opened on Oct 26, 2026

• Native Iceberg write silently falls back on Iceberg 1.12: ManifestFiles.read(ManifestFile, FileIO) was removed

  requires-triage
  apache/datafusion-comet#7240 · Filter by author cornelcreanga opened on Oct 26, 2026

• Native Iceberg write fails with "no more field nodes" on a struct column when its input is a Spark-to-Arrow conversion

  requires-triage
  apache/datafusion-comet#7239 · Filter by author cornelcreanga opened on Oct 26, 2026

• Bug triage results: 2026-10-26

  requires-triage
  apache/datafusion-comet#7230 · Filter by author andygrove opened on Oct 26, 2026

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

  area:expressionsbugcorrectnesspriority:critical
  apache/datafusion-comet#7224 · Filter by author ninglinLiu opened on Oct 25, 2026 · 1.3.0

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

  bugpriority:high
  apache/datafusion-comet#7223 · Filter by author dwsmith1983 opened on Oct 25, 2026 · 1.3.0
  

• Native NUMERIC_OUT_OF_SUPPORTED_RANGE error surfaces as SparkException instead of SparkArithmeticException

  area:expressionsbugpriority:low
  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:low
  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:scanbugpriority:lowuser 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:Icebergarea:scanbugcorrectnesspriority:critical
  apache/datafusion-comet#7212 · Filter by author andygrove opened on Oct 25, 2026 · 1.3.0

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

  area:expressionsbugpriority:mediumtemporal 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

  area:expressionsbugcorrectnesspriority:mediumtemporal expressions
  apache/datafusion-comet#7210 · Filter by author andygrove opened on Oct 25, 2026 · 1.3.0

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

  area:expressionsbugcorrectnesspriority:criticaltemporal expressions
  apache/datafusion-comet#7209 · Filter by author andygrove opened on Oct 25, 2026 · 1.3.0

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

  area:aggregationbackport-1.2bugcorrectnesspriority:critical
  apache/datafusion-comet#7208 · Filter by author andygrove opened on Oct 25, 2026 · 1.3.0
  

• 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:aggregationbackport-1.2bugcorrectnesspriority:criticalregression
  apache/datafusion-comet#7203 · Filter by author andygrove opened on Oct 25, 2026 · 1.3.0
  1

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

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