amansinha100 commented on a change in pull request #1772: DRILL-7187: Improve
selectivity estimation of BETWEEN predicates and …
URL: https://github.com/apache/drill/pull/1772#discussion_r279828965
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File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/DrillRelMdSelectivity.java
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@@ -356,8 +426,8 @@ private boolean isMultiColumnPredicate(final RexNode node)
{
return findAllRexInputRefs(node).size() > 1;
}
- private static List<RexInputRef> findAllRexInputRefs(final RexNode node) {
- List<RexInputRef> rexRefs = new ArrayList<>();
+ private static Set<RexInputRef> findAllRexInputRefs(final RexNode node) {
Review comment:
Yes, thanks for pointing that out, even though that predicate $0=$0 is
unexpected (something to investigate in future). I have reverted this change
and it returns a List as before. Instead, now where the original call to
`isMultiColumnPredicate()` happens I added a second condition (line 182) that
ensures that conditions of type `$1 > 10 AND $1 < 20` which are created after
calling `preProcessRangeConditions()` are not considered the same as
multicolumn predicates.
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