bruno-roustant opened a new pull request #1007: LUCENE-9045: Do not use TreeMap/TreeSet in BlockTree and PerFieldPostingsFormat URL: https://github.com/apache/lucene-solr/pull/1007 The BlockTreeTermsReader.iterator() was detected by a profiler to spend abnormal time in TreeMap.keySet().iterator() iteration. The fix is to use a simple sorted list once the collection of fields is built. Same detection and fix for PerFieldPostingsFormat.
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