HeartSaVioR commented on a change in pull request #23916:
[SPARK-22000][SQL][FOLLOWUP] Add comment and simple cleanup to
DeserializerBuildHelper
URL: https://github.com/apache/spark/pull/23916#discussion_r261056537
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/DeserializerBuildHelper.scala
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@@ -44,25 +44,38 @@ object DeserializerBuildHelper {
upCastToExpectedType(newPath, dataType, walkedTypePath)
}
+ /**
+ * Returns an expression that can be used to deserialize input expression.
+ *
+ * @param expr The input expression that can be used to extract serialized
value.
+ * @param nullable Whether deserialized expression evalutes to null value.
+ * @param walkedTypePath The paths from top to bottom to access current
field when deserializing.
+ * @param funcForCreatingDeserializer Given input expression and typed path,
this function
+ * returns deserializer expression.
+ */
def deserializerForWithNullSafety(
Review comment:
I think `expressionWithNullSafety` is more general naming so might be
preferred one, but `deserializerForWithNullSafety` is also a good name cause we
have relevant method `deserializerForWithNullSafetyAndUpcast`.
So that's a matter of preference and either can be removed. Which method
would we prefer to keep?
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