[LUCENE-9245] Reduce AutomatonTermsEnum memory usage

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 8.5
• Lucene Fields: New
• Assignee: Bruno Roustant
• Reporter: Bruno Roustant
• Created: 24/Feb/20 09:21
• Updated: 28/Aug/22 15:59
• Resolved: 28/Feb/20 10:05

Description

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)

Issue Links

• links to: GitHub Pull Request #1281