[LUCENE-8552] optimize getMergedFieldInfos for one-segment FieldInfos

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.7
• Lucene Fields: New
• Assignee: David Smiley
• Reporter: David Smiley
• Created: 31/Oct/18 16:37
• Updated: 28/Aug/22 15:37
• Resolved: 16/Nov/18 22:00

Description

FieldInfos.getMergedFieldInfos could trivially return the FieldInfos of the first and only LeafReader if there is only one LeafReader.

Also... if there is more than one LeafReader, and if FieldInfos & FieldInfo implemented equals() & hashCode() (including a cached hashCode), maybe we could also call equals() iterating through the FieldInfos to see if we should bother adding it to the FieldInfos.Builder? Admittedly this is speculative; may not be worth the bother.

Issue Links

• links to: GitHub Pull Request #499