Yuvraj2172 opened a new pull request, #58863:
URL: https://github.com/apache/spark/pull/58863
…elds tagged with a trait
### What changes were proposed in this pull request?
`ScalaReflection.getConstructorParameters` crashed with a `MatchError` when a
case class field's type was a compound type formed with `with` (e.g. `case
class Bar(x: Foo with Tag)`), since such a type is represented as a
`RefinedType` in Scala reflection, not a `TypeRef`. This extends the pattern
match to handle that case, and also fixes a second issue in `constructParams`:
a `RefinedType` has no constructor of its own, so member lookup needs to fall
back to the type's erasure (which collapses it to its single concrete class
parent) to find the real constructor.
### Why are the changes needed?
This is a real, reproducible crash reported in the JIRA:
```scala
trait Tag
case class Foo(x: Int)
case class Bar(x: Foo with Tag)
ExpressionEncoder.apply[Bar]()
```
throws `scala.MatchError: Foo with Tag (of class ...RefinedType0)`. Trait
tags like this are a common pattern for adding compile-time-only type safety
without extra runtime fields, and there's no reason encoder derivation should
fail on them.
### Does this PR introduce any user-facing change? Yes. Case classes with
fields typed as `SomeType with SomeTrait` can now have an `ExpressionEncoder`
derived for them successfully, instead of throwing a `MatchError`.
### How was this patch tested?
Added a new test to `ScalaReflectionSuite` reproducing the JIRA's example (a
case class field tagged with a marker trait) and asserting the derived schema
is correct. All 38 tests in the suite pass, including the existing
generic-type, value-class, and trait-without-companion edge cases, confirming
no regressions.
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### What changes were proposed in this pull request?
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### Why are the changes needed?
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### Does this PR introduce _any_ user-facing change?
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