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Support MapType for ElementAt

good first issueGood for newcomersGood for newcomers

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

Status: Open.

#4684 In apache/datafusion-comet;

· comphead opened on Jun 18, 2026

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

area:expressionsExpression evaluationExpression evaluation

correctness

requires-triage

temporal expressions

Status: Open.

#4682 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

array_union result ordering versus DataFusion is unverified

area:expressionsExpression evaluationExpression evaluation

correctness

requires-triage

Status: Open.

#4681 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

requires-triage

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

requires-triage

temporal expressions

Status: Open.

#4679 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

Move static support decisions from serde convert into getSupportLevel

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4673 In apache/datafusion-comet;

· andygrove opened on Jun 18, 2026

RAT check in Maven build scans temporary release/scratch directories, making release builds slow

requires-triage

Status: Open.

#4671 In apache/datafusion-comet;

· andygrove opened on Jun 17, 2026

chore: Remove invalid spark.sql.optimizer.constantFolding.enabled configuration from java benchmarks.

requires-triage

Status: Open.

#4656 In apache/datafusion-comet;

· wForget opened on Jun 15, 2026

pref: Use builtin compression for arrow ipc writer

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4655 In apache/datafusion-comet;

· wForget opened on Jun 15, 2026

Discussion: remove incompatible native implementations that have a codegen dispatch fallback?

requires-triage

Status: Open.

#4654 In apache/datafusion-comet;

· andygrove opened on Jun 14, 2026

Gate non-default StringTypeWithCollation inputs on Spark 4.0 datetime expressions

bugSomething isn't workingSomething isn't working

requires-triage

Status: Open.

#4646 In apache/datafusion-comet;

· andygrove opened on Jun 12, 2026

Add optional native Lance scan support

requires-triage

Status: Open.

#4632 In apache/datafusion-comet;

· wirybeaver opened on Jun 12, 2026