Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r134626985
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectRecordBatch.java
---
@@ -768,4 +765,73 @@ else if (exprHasPrefix && refHasPrefix) {
}
}
}
+
+ /**
+ * handle FAST NONE specially when Project for query output. This
happens when input returns a
--- End diff --
"handle" --> "Handle"
For future reference, can we rename "FAST NONE" to "empty result set"?
"FAST NONE" is an implementation detail that does not capture why we are
returning NONE. But "empty result set" captures the idea that a result (not
just a batch) has no rows, which is what we are really trying to handle here.
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