Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r136185442
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/record/AbstractSingleRecordBatch.java
---
@@ -125,4 +131,19 @@ public BatchSchema getSchema() {
protected abstract boolean setupNewSchema() throws SchemaChangeException;
protected abstract IterOutcome doWork();
+
+ /**
+ * Default behavior to handle fast NONE (incoming's first next() return
NONE, in stead of OK_NEW_SCHEMA):
+ * FAST NONE could happen when the underneath Scan operators do not
produce any batch with schema.
+ *
--- End diff --
done
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