KazydubB commented on a change in pull request #1386: DRILL-6574: Add option to
push LIMIT(0) on top of SCAN (late limit 0 optimization)
URL: https://github.com/apache/drill/pull/1386#discussion_r203440521
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/FindLimit0Visitor.java
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@@ -126,9 +161,84 @@ public static boolean containsLimit0(final RelNode rel) {
return visitor.isContains();
}
- private boolean contains = false;
+ /**
+ * TODO(DRILL-3993): Use RelBuilder to create a limit node to allow for
applying this optimization in potentially
+ * any of the transformations, but currently this can be applied after Drill
logical transformation, and before
+ * Drill physical transformation.
+ */
+ public static DrillRel addLimitOnTopOfLeafNodes(final DrillRel rel) {
+ final Pointer<Boolean> isUnsupported = new Pointer<>(false);
Review comment:
Because the variable is re-assigned and is used in anonymous classes
(unsupportedFunctionsVisitor, unsupportedOperationsVisitor variables) and
should be (effectively) final.
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