kyotoYaho commented on a change in pull request #533: kylin-3812 optimize the
child CompareTupleFilter in a CompareTupleFilter
URL: https://github.com/apache/kylin/pull/533#discussion_r273513936
##########
File path:
core-metadata/src/main/java/org/apache/kylin/metadata/filter/CompareTupleFilter.java
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@@ -283,6 +289,20 @@ public TupleFilter
acceptOptimizeTransformer(FilterOptimizeTransformer transform
return transformer.visit(this);
}
+ private TupleFilter optimizeChildCompareTupleFilter(CompareTupleFilter
child) {
+ FilterOptimizeTransformer transformer = new
FilterOptimizeTransformer();
+ TupleFilter result = child.acceptOptimizeTransformer(transformer);
+ if (result == ConstantTupleFilter.TRUE) {
+ // use string instead of boolean since it's encoded as string
+ result = new ConstantTupleFilter("true");
+ } else if (result == ConstantTupleFilter.FALSE) {
+ result = new ConstantTupleFilter("false");
+ } else {
+ this.isNormal = false;
Review comment:
Why do you think AlwaysTrue or AlwaysFalse cannot be pushed down? Current
CompareTupleFilter does not well support the case that any of its children is a
CompareTupleFilter and is not alway true or always false. Only in this case
push down will be disabled. This behavior is not changed.
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