justaparth commented on code in PR #40686:
URL: https://github.com/apache/spark/pull/40686#discussion_r1181126482
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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:
ah one thing here, the if statement is quite subtle as its written which i
think is contributing to confusion :(. let me update the PR to make a small
change here that I think will make this more clear
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