leventov commented on a change in pull request #7595: Optimize overshadowed
segments computation
URL: https://github.com/apache/incubator-druid/pull/7595#discussion_r291285065
##########
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)
Review comment:
You can actually enforce usage of the new method using by adding these two
Structural Search patterns:
```
$x$.entrySet().stream().collect(Collectors.toMap(Entry::getKey, $y$))
```
and
```
$x$.entrySet().stream().collect(Collectors.toMap($k$ -> $k$.getKey(), $y$))
```
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