Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/403#discussion_r58957028
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/FindLimit0Visitor.java
---
@@ -43,7 +50,15 @@
public static boolean containsLimit0(RelNode rel) {
FindLimit0Visitor visitor = new FindLimit0Visitor();
rel.accept(visitor);
- return visitor.isContains();
+
+ if (!visitor.isContains()) {
+ return false;
+ }
+
+ final FindHardDistributionScans hdVisitor = new
FindHardDistributionScans();
+ rel.accept(hdVisitor);
+ // Can't optimize limit 0 if the query contains a table which has hard
distribution requirement.
+ return !hdVisitor.contains();
--- End diff --
LGTM
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