Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r135925006
--- 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 --
I change to "handleNullInput" from "handleFastNone".
The concept of "NullInput" captures the scenarios where input does not
produce any batch, and returning NONE directly. The concept of "empty result
set" could mean the case where we have 0 row, but still we could have a batch.
I think "empty result set" is not precisely what we want to cover here.
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