Github user mayya-sharipova commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/320#discussion_r167649286
--- Diff: lucene/core/src/java/org/apache/lucene/index/FieldInfos.java ---
@@ -63,21 +62,30 @@ public FieldInfos(FieldInfo[] infos) {
boolean hasNorms = false;
boolean hasDocValues = false;
boolean hasPointValues = false;
-
- TreeMap<Integer, FieldInfo> byNumber = new TreeMap<>();
+
+ int size = 0; // number of elements in byNumberTemp
+ int capacity = 10; // byNumberTemp's capacity
+ FieldInfo[] byNumberTemp = new FieldInfo[capacity];
--- End diff --
@diegoceccarelli thanks for a suggestion. I considered `ArrayList` as well,
but the code was even more complex. `byNumberTemp` could potentially be a
sparse array, where some positions don't have values. You also need to
`ensureCapacity` of the ArrayList, and `add` null elements.
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