Github user Ben-Zvi commented on a diff in the pull request:
https://github.com/apache/drill/pull/822#discussion_r118592786
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
---
@@ -133,6 +133,9 @@
the need to turn off join optimization may go away.
*/
public static final BooleanValidator JOIN_OPTIMIZATION = new
BooleanValidator("planner.enable_join_optimization", true);
+ // for testing purpose
--- End diff --
@VisibleForTesting annotates methods; but this is a session option.
Also (hidden) is the possibility that this option may be used in production
in case some query yields a single phase hashagg but still has too much data to
handle.
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