clintropolis commented on a change in pull request #5872: add method
getRequiredColumns for DimFilter
URL: https://github.com/apache/incubator-druid/pull/5872#discussion_r310786713
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File path: processing/src/main/java/io/druid/query/filter/DimFilter.java
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@@ -75,4 +77,9 @@
* determine for this DimFilter.
*/
RangeSet<String> getDimensionRangeSet(String dimension);
+
+ /**
+ * @return a HashSet that represents all columns' name which the DimFilter
required to do filter.
+ */
+ HashSet<String> getRequiredColumns();
Review comment:
I'm making this change to use `Set` as part of #8209.
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