rangadi commented on code in PR #40686:
URL: https://github.com/apache/spark/pull/40686#discussion_r1181139613
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connector/protobuf/src/main/scala/org/apache/spark/sql/protobuf/ProtobufDeserializer.scala:
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@@ -299,6 +298,29 @@ private[sql] class ProtobufDeserializer(
}
}
+ private def getFieldValue(record: DynamicMessage, field: FieldDescriptor):
AnyRef = {
+ // We return a value if one of:
+ // - the field is repeated
+ // - the field is explicitly present in the serialized proto
+ // - the field is proto2 with a default
+ // - field presence is not available and materializeZeroValues is set
+ //
+ // Repeated fields have to be treated separately as they cannot have
`hasField`
+ // called on them. And we only materialize zero values for fields without
presence
+ // information because that flag controls the behavior for those fields in
the ambiguous
+ // case of "unset" or "set to zero value". See the docs in
[[ProtobufOptions]] for more
+ // details.
+ if (
+ field.isRepeated
+ || record.hasField(field)
+ || field.hasDefaultValue
+ || (!field.hasPresence && this.materializeZeroValues)) {
Review Comment:
I would prefer to have the check. Message type is pretty important. You have
a test covering it, that is good.
We don't want to serialize messages even if some future java library changes
meaning of 'hasPresense' (though likely will not).
It is ok if you add a comment that it is really not required.
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