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Change Comet default Spark version to 4.0

enhancementNew feature or requestNew feature or request

requires-triage

spark 4

Status: Open.

#4054 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

·  

0.16.0

Broadcast hash join and sort-merge join can produce incorrect results on non-default collated keys [Spark 4]

bugSomething isn't workingSomething isn't working

correctness

priority:criticalData corruption, silent wrong results, security issuesData corruption, silent wrong results, security issues

spark 4

Status: Open.

#4051 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

Improve audit & correctness checking/reporting processes

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4050 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

Spark 4.0 sql_hive-1: HiveUDFDynamicLoadSuite fails to load UDF classes from hive-contrib

requires-triage

Status: Open.

#4049 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

Comet DPP exchange/broadcast reuse fails under AQE

requires-triage

Status: Open.

#4045 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

native_datafusion: scalar subquery pushdown does not produce ReusedSubqueryExec

bugSomething isn't workingSomething isn't working

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

spark 4

Status: Open.

#4042 In apache/datafusion-comet;

· andygrove opened on Apr 23, 2026

Migrate 4.0.1 support to 4.0.2

enhancementNew feature or requestNew feature or request

requires-triage

spark 4

Status: Open.

#4027 In apache/datafusion-comet;

· kazuyukitanimura opened on Apr 22, 2026

perf: Iceberg DPP executes dim table broadcast twice instead of reusing join's broadcast exchange

area:Iceberg

performance

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4022 In apache/datafusion-comet;

· mbutrovich opened on Apr 21, 2026

Remove native_iceberg_compat scan

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4020 In apache/datafusion-comet;

· andygrove opened on Apr 21, 2026

Enable windowed aggregates and fix correctness issues

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4007 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026

Add distinction between "info" and "fallback" messages

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4006 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026

[EPIC] Improve Comet planning

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4005 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026