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Implement JVM UDFs for JSON expressions

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4313 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

·  

0.18.0

Add support for native custom scalar UDFs

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4312 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

·  

0.18.0

Implement JVM UDFs for all date/time expressions

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4311 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

·  

0.18.0

[DISCUSS] Simplify regex engine + incompatibility config model

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4310 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

Windows crash if frame overflow

bugSomething isn't workingSomething isn't working

requires-triage

Status: Open.

#4307 In apache/datafusion-comet;

· comphead opened on May 12, 2026

Consider deprecating spark.comet.schemaEvolution.enabled

area:scanParquet scan / data readingParquet scan / data reading

requires-triage

Status: Open.

#4298 In apache/datafusion-comet;

· andygrove opened on May 12, 2026

native_datafusion: silent wrong-answer paths for primitive Parquet type conversions Spark rejects

area:scanParquet scan / data readingParquet scan / data reading

bugSomething isn't workingSomething isn't working

native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan type

requires-triage

Status: Open.

#4297 In apache/datafusion-comet;

· andygrove opened on May 12, 2026

[FEATURE] Native scan support for VariantType columns (Iceberg + Spark 4.0)

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4295 In apache/datafusion-comet;

· Shekharrajak opened on May 12, 2026

Allocate Comet's parquet reader buffers from ArrowUtils.rootAllocator to enable zero-copy PyArrow UDF runner

requires-triage

Status: Open.

#4294 In apache/datafusion-comet;

· andygrove opened on May 12, 2026

Windows crash with decimal frame

bugSomething isn't workingSomething isn't working

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

Status: Open.

#4293 In apache/datafusion-comet;

· comphead opened on May 11, 2026

Make CI run on the contributor forks

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4289 In apache/datafusion-comet;

· comphead opened on May 11, 2026

Implement TimeType support

enhancementNew feature or requestNew feature or request

EPIC

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

requires-triage

spark 4.1

Status: Open.

#4288 In apache/datafusion-comet;

· parthchandra opened on May 11, 2026