Bruno Roustant created LUCENE-9045:
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Summary: Do not use TreeMap/TreeSet in BlockTree and
PerFieldPostingsFormat
Key: LUCENE-9045
URL: https://issues.apache.org/jira/browse/LUCENE-9045
Project: Lucene - Core
Issue Type: Improvement
Reporter: Bruno Roustant
TreeMap/TreeSet is a heavy structure designed to dynamically sort keys. It's
iterator is much less performant than a list iterator. We should not use it
when we don't need the sorting capability once built.
And this is the case in BlockTreeTermsReader and PerFieldPostingsFormat. We
need a Map and to sort keys at building time. But once built, we don't need to
sort anymore, we can use a simple list for iteration efficiency.
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