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Support fully-native multi-stage (distinct-combined) collect_list / collect_set

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4724 In apache/datafusion-comet;

· andygrove opened on Jun 24, 2026

Comet produces bloated results in comparison with Spark

bugSomething isn't workingSomething isn't working

requires-triage

Status: Open.

#4723 In apache/datafusion-comet;

· sandugood opened on Jun 24, 2026

[Bug] percentile: DataFusion quantizes interpolation weight to 6 decimal places

correctness

requires-triage

Status: Open.

#4719 In apache/datafusion-comet;

· andygrove opened on Jun 24, 2026

Comet aggregation task crashes with offset overflow

bugSomething isn't workingSomething isn't working

requires-triage

Status: Open.

#4718 In apache/datafusion-comet;

· comphead opened on Jun 24, 2026

Table Provider API

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4706 In apache/datafusion-comet;

· kazuyukitanimura opened on Jun 22, 2026

Bug triage results: 2026-06-22

requires-triage

Status: Open.

#4705 In apache/datafusion-comet;

· mbutrovich opened on Jun 22, 2026

[Proposal] Scan I/O acceleration: node-local fragment cache, asynchronous prefetch, and cache-affinity scheduling

area:scanParquet scan / data readingParquet scan / data reading

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

Status: Open.

#4695 In apache/datafusion-comet;

· schenksj opened on Jun 20, 2026

Add CONTRIBUTING.md with link to the contributor guide

documentationImprovements or additions to documentationImprovements or additions to documentation

enhancementNew feature or requestNew feature or request

good first issueGood for newcomersGood for newcomers

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4694 In apache/datafusion-comet;

· andygrove opened on Jun 19, 2026

[Bug] unix_timestamp support level disagrees with documented TimestampNTZ tz-conversion divergence

area:expressionsExpression evaluationExpression evaluation

correctness

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

temporal expressions

Status: Open.

#4682 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

[Bug] map_from_arrays / map_from_entries do not enforce null-key rejection or spark.sql.mapKeyDedupPolicy

area:expressionsExpression evaluationExpression evaluation

correctness

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

Status: Open.

#4680 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

[Bug] make_timestamp does not throw under spark.sql.ansi.enabled=true

area:expressionsExpression evaluationExpression evaluation

correctness

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

temporal expressions

Status: Open.

#4679 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

Move static support decisions from serde convert into getSupportLevel

area:expressionsExpression evaluationExpression evaluation

enhancementNew feature or requestNew feature or request

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4673 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026