leventov commented on a change in pull request #7595: Optimize overshadowed
segments computation
URL: https://github.com/apache/incubator-druid/pull/7595#discussion_r291276853
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File path: core/src/main/java/org/apache/druid/utils/CollectionUtils.java
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@@ -68,6 +71,17 @@ public int size()
};
}
+ /**
+ * Returns a transformed map from the given input map where the value is
modified based on the given valueMapper
+ * function.
+ */
+ public static <K, V, V2> Map<K, V2> transformValues(Map<K, V> map,
Function<V, V2> valueMapper)
+ {
+ final Map<K, V2> result = new HashMap<>();
Review comment:
Better to use `Maps.newHashMapWithExpectedSize(map.size())` here
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