chaoqin-li1123 commented on code in PR #44643:
URL: https://github.com/apache/spark/pull/44643#discussion_r1456458316
##########
connector/protobuf/src/main/scala/org/apache/spark/sql/protobuf/utils/ProtobufOptions.scala:
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@@ -207,6 +207,12 @@ private[sql] class ProtobufOptions(
// nil => nil, Int32Value(0) => 0, Int32Value(100) => 100.
val unwrapWellKnownTypes: Boolean =
parameters.getOrElse("unwrap.primitive.wrapper.types",
false.toString).toBoolean
+
+ // Since Spark doesn't allow empty StructType, empty proto message type as
field will be
+ // dropped by default. Setting this option to true will insert a dummy
column to empty proto
+ // message so that the empty message will be retained.
+ val retainEmptyMessage: Boolean =
+ parameters.getOrElse("retain.empty.message", false.toString).toBoolean
Review Comment:
Renamed.
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