uros-b commented on code in PR #56864:
URL: https://github.com/apache/spark/pull/56864#discussion_r3735132616
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala:
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@@ -996,6 +996,7 @@ object FunctionRegistry {
expressionBuilder("try_variant_set", TryVariantSetExpressionBuilder),
expressionBuilder("variant_array_append",
VariantArrayAppendExpressionBuilder),
expressionBuilder("try_variant_array_append",
TryVariantArrayAppendExpressionBuilder),
+ expression[VariantStripNulls]("variant_strip_nulls"),
Review Comment:
Registering with expression[VariantStripNulls] means variant_strip_nulls(v,
include_arrays => false) fails — FunctionRegistry.expression[T] throws
namedArgumentsNotSupported when it sees a NamedArgumentExpression.
variant_set / try_variant_set, the closest analogue (optional trailing
boolean), register through expressionBuilder and declare the argument in a
FunctionSignature, which is what makes create_if_missing => false legal:
```
// variantExpressions.scala:1196-1198
val createIfMissingArg =
InputParameter("create_if_missing", Some(Literal.create(true,
BooleanType)))
Some(FunctionSignature(Seq(vArg, pathArg, valArg, createIfMissingArg)))
```
Using a VariantStripNullsExpressionBuilder would give named-argument support
and let the default live in the signature rather than in the secondary
constructor at variantExpressions.scala:1525.
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