Robert Muir created LUCENE-6325:
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Summary: improve perf and memory of FieldInfos.fieldInfo(int)
Key: LUCENE-6325
URL: https://issues.apache.org/jira/browse/LUCENE-6325
Project: Lucene - Core
Issue Type: Sub-task
Reporter: Robert Muir
FieldInfos.fieldInfo(int) looks up a field by number and returns its FieldInfo.
This method is called per-field-per-doc in things like stored fields and
vectors readers.
Unfortunately, today this method is always backed by a TreeMap. In most cases a
simple array is better, its faster and uses less memory.
These changes made significant difference in stored fields checkindex time with
my test index (had only 10 fields). Maybe it helps merge as well.
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