[jira] [Created] (LUCENE-9045) Do not use TreeMap/TreeSet in BlockTree and PerFieldPostingsFormat

["Bruno Roustant (Jira)" <ji...@apache.org>]

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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