Bruno Roustant created LUCENE-9245:
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Summary: Optimize AutomatonTermsEnum and
Operations.getCommonPrefixBytesRef
Key: LUCENE-9245
URL: https://issues.apache.org/jira/browse/LUCENE-9245
Project: Lucene - Core
Issue Type: Improvement
Reporter: Bruno Roustant
Assignee: Bruno Roustant
Reduce AutomatonTermsEnum memory usage. It uses a long[] with size = number of
automaton states, which may be large. Instead we can reduce to short[] with
slightly faster performance. (I tried a FixedBitSet, but it requires to clear
and this impacts negatively performance)
Operations.getCommonPrefixBytesRef() is used by CompiledAutomaton to compute
the common suffix for all automatons with infinite language. It can be
optimized with lazy structure creation and less operations. This gave some %
improvement in my benchmarks (LUCENE-9237).
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