Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10431#discussion_r48248538
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -467,13 +467,16 @@ object ScalaReflection extends ScalaReflection {
case t if t <:< localTypeOf[Product] =>
val params = getConstructorParameters(t)
- CreateNamedStruct(params.flatMap { case (fieldName, fieldType) =>
- val fieldValue = Invoke(inputObject, fieldName,
dataTypeFor(fieldType))
- val clsName = getClassNameFromType(fieldType)
- val newPath = s"""- field (class: "$clsName", name:
"$fieldName")""" +: walkedTypePath
-
- expressions.Literal(fieldName) :: extractorFor(fieldValue,
fieldType, newPath) :: Nil
- })
+ expressions.If(
+ IsNull(inputObject),
+ expressions.Literal.create(null, silentSchemaFor(t).dataType),
+ CreateNamedStruct(params.flatMap { case (fieldName, fieldType)
=>
+ val fieldValue = Invoke(inputObject, fieldName,
dataTypeFor(fieldType))
+ val clsName = getClassNameFromType(fieldType)
+ val newPath = s"""- field (class: "$clsName", name:
"$fieldName")""" +: walkedTypePath
+ expressions.Literal(fieldName) :: extractorFor(fieldValue,
fieldType, newPath) :: Nil
+ })
+ )
--- End diff --
nit: we can split this into 2 parts
```
val row = CreateNamedStruct(...)
expression.If(
IsNull...
expression.Literal.create(null, row.dataType),
row
)
```
which looks arguably more clear.
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