Revert Spark Elt nullability change #19510
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This was referenced Dec 27, 2025
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Which issue does this PR close?
eltneed to have custom nullability #19172Rationale for this change
Spark Elt function is always nullable:
https://github.com/apache/spark/blob/eec092c9f9d1ad3df0390b1ea56340c1103ba887/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala#L286-L297
The change to depend on input nullability was incorrect, so revert it.
What changes are included in this PR?
Revert Spark elt function to have nullability as true by default.
Are these changes tested?
Are there any user-facing changes?