viirya 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_r261048760
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/DeserializerBuildHelper.scala
##########
@@ -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(
expr: Expression,
- dataType: DataType,
Review comment:
`dataType` is useless here.
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