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Implement Spark-compatible upper/lower using codegen dispatch

enhancementNew feature or requestNew feature or request

performance

Status: Open.

#4498 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

·  

0.17.0

[Bug] replace returns wrong result for empty-string search

bugSomething isn't workingSomething isn't working

requires-triage

Status: Open.

#4497 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

Do another audit sweep for string collation differences

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4496 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] CAST(complex AS STRING) does not honour spark.sql.legacy.castComplexTypesToString.enabled

correctness

requires-triage

Status: Open.

#4492 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Feature] CAST(MapType AS MapType) falls back even though native cast_map_to_map exists

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4491 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Doc] CAST has no explicit TimeType branch (Spark 4.1)

documentationImprovements or additions to documentationImprovements or additions to documentation

requires-triage

spark 4.1

Status: Open.

#4490 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Doc] CAST collated-string handling on Spark 4.0+ is implicit and untested

documentationImprovements or additions to documentationImprovements or additions to documentation

requires-triage

Status: Open.

#4489 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] CAST(BinaryType AS StringType) uses unsafe from_utf8_unchecked (undefined behaviour)

correctness

requires-triage

Status: Open.

#4488 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] width_bucket bypasses CometExpressionSerde framework

enhancementNew feature or requestNew feature or request

requires-triage

Status: Open.

#4485 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] try_mod falls back to Spark because CometRemainder rejects EvalMode.TRY

correctness

requires-triage

Status: Open.

#4484 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] array_max and array_min disagree with Spark on NaN ordering

correctness

requires-triage

Status: Open.

#4482 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

[Bug] array_distinct / array_union / array_except do not canonicalize NaN like Spark

correctness

requires-triage

Status: Open.

#4481 In apache/datafusion-comet;

· andygrove opened on May 28, 2026