cloud-fan commented on code in PR #36593:
URL: https://github.com/apache/spark/pull/36593#discussion_r877113355
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sql/core/src/main/scala/org/apache/spark/sql/catalyst/util/V2ExpressionBuilder.scala:
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@@ -201,6 +203,14 @@ class V2ExpressionBuilder(
None
}
// TODO supports other expressions
+ case ApplyFunctionExpression(function, children) =>
+ val childrenExpressions = children.flatMap(generateExpression(_))
+ if (childrenExpressions.length == children.length) {
+ Some(new
GeneralScalarExpression(function.name().toUpperCase(Locale.ROOT),
Review Comment:
UDF is kind of special and I think it's better to have a new v2 API for it,
instead of reusing `GeneralScalarExpression`.
e.g., we can add a `ScalarUDFExpression`, which defines the function name,
canonical name and inputs.
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