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OpenAug 4, 2026
Due by August 7, 2026
•Last updated 80% complete
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Consistent debug logging levels and messages
enhancementNew feature or requestNew feature or requestStatus: Open.#3445 In apache/datafusion-comet;Comet 1.0.0 Release
enhancementNew feature or requestNew feature or requestStatus: Open.#4082 In apache/datafusion-comet;Audit Spark SQL configs that affect query semantics and ensure Comet honors them (or falls back)
area:expressionsExpression evaluationExpression evaluationarea:scanParquet scan / data readingParquet scan / data readingenhancementNew feature or requestNew feature or requestpriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#4180 In apache/datafusion-comet;Enable spark.comet.exec.localTableScan.enabled when running Spark SQL tests
priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmeticspark sql testsSpark SQL test failuresSpark SQL test failuresStatus: Open.#4347 In apache/datafusion-comet;Register CometArrowAllocator as a Spark MemoryConsumer for JVM-UDF dispatch
area:expressionsExpression evaluationExpression evaluationarea:ffiArrow FFI / JNI boundaryArrow FFI / JNI boundarypriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#4174 In apache/datafusion-comet;Re-enable COUNT for mixed Spark partial / Comet final aggregate execution
area:aggregationHash aggregates, aggregate expressionsHash aggregates, aggregate expressionspriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#4242 In apache/datafusion-comet;[hdfs-opendal] Got an
reader got too little dataerror on hdfs-opendalarea:scanParquet scan / data readingParquet scan / data readingbugSomething isn't workingSomething isn't workingnative_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan typepriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#2400 In apache/datafusion-comet;ExecutionMemoryPool errors releasing more memory than allocated
bugSomething isn't workingSomething isn't workingpriority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakageStatus: Open.#2453 In apache/datafusion-comet;Dropping a GlobalRef in a detached thread
area:ffiArrow FFI / JNI boundaryArrow FFI / JNI boundarybugSomething isn't workingSomething isn't workingpriority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakageStatus: Open.#2470 In apache/datafusion-comet;native_datafusion: ParquetSchemaConvert error does not include the file path
native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan typeStatus: Open.#4316 In apache/datafusion-comet;Establish nomenclature style guide and audit operator names for clarity
documentationImprovements or additions to documentationImprovements or additions to documentationpriority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmeticStatus: Open.#4419 In apache/datafusion-comet;Add a docs-review Claude skill to enforce style guide and documentation quality
documentationImprovements or additions to documentationImprovements or additions to documentationpriority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmeticStatus: Open.#4420 In apache/datafusion-comet;CometHashAggregateExec doesn't participate in Spark's AQEPropagateEmptyRelation optimization
area:aggregationHash aggregates, aggregate expressionsHash aggregates, aggregate expressionspriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#4412 In apache/datafusion-comet;Codify Iceberg version compatibility
area:ciCI/CD, GitHub Actions, build toolingCI/CD, GitHub Actions, build toolingenhancementNew feature or requestNew feature or requestStatus: Open.#4871 In apache/datafusion-comet;[EPIC] Optimize native scalar expressions used in TPC-DS
area:expressionsExpression evaluationExpression evaluationenhancementNew feature or requestNew feature or requestStatus: Open.#4936 In apache/datafusion-comet;Ranked backlog: native scalar expressions with per-row optimization opportunities
enhancementNew feature or requestNew feature or requestStatus: Open.#4942 In apache/datafusion-comet;Optimize
WideDecimalBinaryExpr: skip the null-masking pass in non-ANSI mode when nothing overflowsarea:expressionsExpression evaluationExpression evaluationenhancementNew feature or requestNew feature or requestStatus: Open.#4943 In apache/datafusion-comet;perf: optimize native shuffle writer (redundant copies, per-block allocations)
enhancementNew feature or requestNew feature or requestStatus: Open.#5002 In apache/datafusion-comet;RANGE window frame boundary overflow diverges from Spark for DATE and DECIMAL ORDER BY
area:expressionsExpression evaluationExpression evaluationbugSomething isn't workingSomething isn't workingpriority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakageStatus: Open.#5022 In apache/datafusion-comet;Object store cache key drops the ABFS container, so two containers in one storage account share a store instance
area:scanParquet scan / data readingParquet scan / data readingbugSomething isn't workingSomething isn't workinghelp wantedExtra attention is neededExtra attention is neededpriority:criticalData corruption, silent wrong results, security issuesData corruption, silent wrong results, security issuesStatus: Open.#4993 In apache/datafusion-comet;Native panic casting to negative-scale decimal when spark.sql.legacy.allowNegativeScaleOfDecimal=true
area:expressionsExpression evaluationExpression evaluationbugSomething isn't workingSomething isn't workingcrashNative engine crash/panic/segfaultNative engine crash/panic/segfaultpriority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakageStatus: Open.#5013 In apache/datafusion-comet;Follow-up: docs and test-coverage hardening for native collect_list / array_agg (#4720)
area:aggregationHash aggregates, aggregate expressionsHash aggregates, aggregate expressionsarea:expressionsExpression evaluationExpression evaluationenhancementNew feature or requestNew feature or requestStatus: Open.#5024 In apache/datafusion-comet;Allow individual cast conversions to be enabled/disabled
area:expressionsExpression evaluationExpression evaluationenhancementNew feature or requestNew feature or requestpriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#5015 In apache/datafusion-comet;[Bug] map_from_arrays / map_from_entries do not enforce null-key rejection or spark.sql.mapKeyDedupPolicy
area:expressionsExpression evaluationExpression evaluationbugSomething isn't workingSomething isn't workingpriority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken featuresStatus: Open.#4680 In apache/datafusion-comet;Native implementation of
get_json_objectreturns last value for duplicate keys, Spark returns firstarea:expressionsExpression evaluationExpression evaluationbugSomething isn't workingSomething isn't workingpriority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakageStatus: Open.#4947 In apache/datafusion-comet;