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Add optional native Lance scan support

requires-triage

Status: Open.

#4632 In apache/datafusion-comet;

· wirybeaver opened on Jun 12, 2026

chore: Improve cast MapType to String

good first issueGood for newcomersGood for newcomers

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

Status: Open.

#4631 In apache/datafusion-comet;

· comphead opened on Jun 12, 2026

perf: use aligned slice access in SparkUnsafeArray bulk append

requires-triage

Status: Open.

#4626 In apache/datafusion-comet;

· andygrove opened on Jun 11, 2026

Bug triage results: 2026-06-11

requires-triage

Status: Open.

#4625 In apache/datafusion-comet;

· andygrove opened on Jun 11, 2026

docs: update CometBatchIterator references

documentationImprovements or additions to documentationImprovements or additions to documentation

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

Status: Open.

Task

#4624 In apache/datafusion-comet;

· mbutrovich opened on Jun 11, 2026

·  

0.17.0

Test dual-impl (native + codegen-dispatch) expressions consistently across the full routing matrix

area:expressionsExpression evaluationExpression evaluation

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

Status: Open.

#4616 In apache/datafusion-comet;

· andygrove opened on Jun 10, 2026

Performance regression when a stage of WholeStageCodegen-fusible operators runs as separate native Comet operators

performance

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

Status: Open.

#4614 In apache/datafusion-comet;

· mbutrovich opened on Jun 9, 2026

Deliberately opt eligible Incompatible expressions into codegen dispatch with test coverage

area:expressionsExpression evaluationExpression evaluation

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

Status: Open.

#4596 In apache/datafusion-comet;

· andygrove opened on Jun 4, 2026

ci: Remove ORC testing from Iceberg Java tests

area:ciCI/CD, GitHub Actions, build toolingCI/CD, GitHub Actions, build tooling

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

Status: Open.

#4586 In apache/datafusion-comet;

· mbutrovich opened on Jun 3, 2026

Support nested array with struct elements in sort_array

enhancementNew feature or requestNew feature or request

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

Status: Open.

#4584 In apache/datafusion-comet;

· hsiang-c opened on Jun 3, 2026

Rebalance deep associative binary expression chains (Add, Multiply, bitwise) to avoid protobuf recursion limit

area:expressionsExpression evaluationExpression evaluation

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

Status: Open.

#4577 In apache/datafusion-comet;

· andygrove opened on Jun 2, 2026

Investigate adopting DataFusion's allocator-level memory accounting to replace manual memory tuning

enhancementNew feature or requestNew feature or request

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

Status: Open.

#4576 In apache/datafusion-comet;

· andygrove opened on Jun 2, 2026

·  

1.0.0