jasonk000 commented on a change in pull request #12105:
URL: https://github.com/apache/druid/pull/12105#discussion_r776540734
##########
File path:
processing/src/main/java/org/apache/druid/segment/DimensionDictionary.java
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@@ -84,6 +84,19 @@ public T getValue(int id)
}
}
+ public void getValuesInto(int[] ids, T[] values)
+ {
+ lock.readLock().lock();
+ try {
+ for (int i = 0; i < ids.length; i++) {
Review comment:
Good point on checking array lengths match.
I did explore returning value only (that's my internal impl actually), but
it requires wider changes. Specifically, since Java erases generics, it's
impossible to do `new T[]`. So, we have to either do something like:
```
StringDimensionIndexer() constructor {
super(String.class);
}
// and then propagate this Class<T> to DimensionDictionary, and in
DimensionDictionary, do a:
T[] out = (T[]) Array.newInstance(typeFromConstructor, keys.length);
```
To me, both are viable and work fine, this approach seems less invasive.
What do you suggest?
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