[GitHub] [kylin] vaful commented on a change in pull request #533: kylin-3812 optimize the child CompareTupleFilter in a CompareTupleFilter

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vaful 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_r269391463
 
 

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 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:
   this means that TupleFilters excepted AlwaysTrue or AlwaysFalse will not pushdown?

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