kazantsev-maksim opened a new pull request, #5040:
URL: https://github.com/apache/datafusion-comet/pull/5040
## Which issue does this PR close?
- N/A
## Rationale for this change
This PR migrates the elt string function from Comet's codegen-based dispatch
path to the shared datafusion-spark implementation, registering it as a native
scalar UDF.
## What changes are included in this PR?
- Register the SparkElt scalar UDF in register_datafusion_spark_function so
it is available to the DataFusion session context alongside the other
Spark-compatible UDFs.
- Change CometElt from CometCodegenDispatch[Elt] to
CometScalarFunction[Elt]("elt")
## How are these changes tested?
Significantly expand the test coverage with many additional inputs to
exercise edge cases
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