icexelloss commented on code in PR #33909:
URL: https://github.com/apache/arrow/pull/33909#discussion_r1095008046
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cpp/proto/substrait/extension_rels.proto:
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@@ -44,3 +44,17 @@ message AsOfJoinRel {
repeated .substrait.Expression by = 2;
}
}
+
+// Named tap relation
+//
+// A tap is a relation having a single input relation that it passes through,
while also
+// causing some side-effect, e.g., writing to external storage.
+message NamedTapRel {
+ // The kind of tap
+ string kind = 1;
+ // A name used to configure the tap, e.g., a URI defining the destination of
writing
+ string name = 2;
+ // Column names for the tap's output. If specified there must be one name
per field.
+ // If empty, field names will be automatically generated.
Review Comment:
Why don't we make the columns required - i.e., if it's missing or doesn't
match the number of fields in the data then it's an illegal message?
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