rangadi commented on code in PR #40686:
URL: https://github.com/apache/spark/pull/40686#discussion_r1181711867
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connector/protobuf/src/main/scala/org/apache/spark/sql/protobuf/utils/ProtobufOptions.scala:
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@@ -46,6 +46,41 @@ private[sql] class ProtobufOptions(
// record has more depth than the allowed value for recursive fields, it
will be truncated
// and corresponding fields are ignored (dropped).
val recursiveFieldMaxDepth: Int =
parameters.getOrElse("recursive.fields.max.depth", "-1").toInt
+
+ // Whether to deserialize empty proto3 scalar fields as their default values.
+ // When a proto3 scalar field is empty, there is ambiguity as to whether the
field
+ // was never set or if the field was explicitly set to zero. By default, the
library
Review Comment:
> Other official libraries that take protobufs and put them into a different
format (e.g. Json) have the option to emit defaults. This PR is implementing
that exact same functionality, with same semantics.
Lets add this to the documentation.
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