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Avoid <code>CometColumnarExchange</code> when next query stage requires <code>CometColumnarToRow</code>

enhancementNew feature or requestNew feature or request

Status: Open.

#2880 In apache/datafusion-comet;

· andygrove opened on Dec 11, 2025

Optimize native shuffle to write schema once per output partition instead of once per batch

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#2928 In apache/datafusion-comet;

· andygrove opened on Dec 17, 2025

Improve performance of <code>startsWith</code> and <code>endsWith</code> expressions

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2973 In apache/datafusion-comet;

· andygrove opened on Dec 23, 2025

Improve performance of <code>repeat</code> expression

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2974 In apache/datafusion-comet;

· andygrove opened on Dec 23, 2025

Improve performance of <code>reverse</code> expression

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2975 In apache/datafusion-comet;

· andygrove opened on Dec 23, 2025

Improve performance of <code>translate</code> expression

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2976 In apache/datafusion-comet;

· andygrove opened on Dec 23, 2025

Improve performance of <code>trim</code> expressions

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2977 In apache/datafusion-comet;

· andygrove opened on Dec 23, 2025

[EPIC] Optimize performance for slow expressions

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

performance

Status: Open.

#2986 In apache/datafusion-comet;

· andygrove opened on Dec 24, 2025

Improve performance of first/last aggregates

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#3022 In apache/datafusion-comet;

· andygrove opened on Jan 2, 2026

Improve performance of conditional expressions

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#3025 In apache/datafusion-comet;

· andygrove opened on Jan 2, 2026

Improve performance of <code>in_list</code> expressions

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#3027 In apache/datafusion-comet;

· andygrove opened on Jan 2, 2026

Improve performance of <code>sha</code> hashing expressions

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#3029 In apache/datafusion-comet;

· andygrove opened on Jan 2, 2026

Remove mutable Parquet buffer use from <code>native_iceberg_compat</code>

enhancementNew feature or requestNew feature or request

Status: Open.

#2152 In apache/datafusion-comet;

· andygrove opened on Aug 14, 2025

Release build script builds JVM components from wrong branch

bugSomething isn't workingSomething isn't working

Status: Open.

#3292 In apache/datafusion-comet;

· andygrove opened on Jan 26, 2026

Proposal: Remove CometFuzz module

enhancementNew feature or requestNew feature or request

Status: Open.

#3350 In apache/datafusion-comet;

· andygrove opened on Jan 30, 2026

Add simple cost-based optimizer and pluggable cost model

enhancementNew feature or requestNew feature or request

Status: Open.

#2785 In apache/datafusion-comet;

· andygrove opened on Nov 14, 2025

Add scripts to automate release process

enhancementNew feature or requestNew feature or request

Status: Open.

#1419 In apache/datafusion-comet;

· andygrove opened on Feb 18, 2025

ExecutionMemoryPool errors releasing more memory than allocated

bugSomething isn't workingSomething isn't working

Status: Open.

#2453 In apache/datafusion-comet;

· andygrove opened on Sep 25, 2025

Include GLIBC version with provided jars

enhancementNew feature or requestNew feature or request

Status: Open.

#2504 In apache/datafusion-comet;

· lfdversluis opened on Sep 30, 2025

Use older version of GLIBC when building official Comet jars

enhancementNew feature or requestNew feature or request

Status: Open.

#2511 In apache/datafusion-comet;

· andygrove opened on Oct 1, 2025

Decide whether we need to run PR and/or Spark SQL tests against debug builds of native libs

enhancementNew feature or requestNew feature or request

Status: Open.

#2544 In apache/datafusion-comet;

· andygrove opened on Oct 10, 2025

Write guide on implementing good unit tests for expressions

enhancementNew feature or requestNew feature or request

Status: Open.

#2642 In apache/datafusion-comet;

· andygrove opened on Oct 23, 2025

fuzz test failure: <code>corr</code> null vs Nan

bugSomething isn't workingSomething isn't working

correctness

Status: Open.

#2646 In apache/datafusion-comet;

· andygrove opened on Oct 24, 2025

date_trunc incorrect results in non-UTC timezone

bugSomething isn't workingSomething isn't working

correctness

Status: Open.

#2649 In apache/datafusion-comet;

· andygrove opened on Oct 25, 2025

Improve <code>checkSparkAnswer</code> methods to allow for validation of expected results

enhancementNew feature or requestNew feature or request

Status: Open.

#2692 In apache/datafusion-comet;

· andygrove opened on Nov 5, 2025