zhengruifeng commented on code in PR #38621:
URL: https://github.com/apache/spark/pull/38621#discussion_r1020987941
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -253,6 +254,23 @@ message Repartition {
bool shuffle = 3;
}
+// Compose the string representing rows for output.
+// It will invoke 'Dataset.showString' to compute the results.
+message ShowString {
+ // (Required). The input relation.
+ Relation input = 1;
+
+ // (Required) Number of rows to show.
Review Comment:
I prefer to make it `required` here.
we can not invoke the `show` methods since they just print and return Unit.
to get a string, we need to invoke `showString` which requires all the
parameters.
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