Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/729#discussion_r103608069
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillRelOptUtil.java
---
@@ -169,4 +175,43 @@ private static boolean containIdentity(List<? extends
RexNode> exps,
}
return true;
}
+
+ /**
+ * Returns whether statistics-based estimates or guesses are used by the
optimizer
+ * */
+ public static boolean guessRows(RelNode rel) {
+ final PlannerSettings settings =
+
rel.getCluster().getPlanner().getContext().unwrap(PlannerSettings.class);
+ if (!settings.useStatistics()) {
+ return true;
+ }
+ if (rel instanceof RelSubset) {
--- End diff --
Added comment explaining the special treatment.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
