[LUCENE-8569] Never count soft-deletes if reader has no hard-deletes

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.5, 8.0
• Fix Version/s: 7.7, 8.0
• Lucene Fields: New, Patch Available
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 20/Nov/18 15:55
• Updated: 28/Aug/22 15:38
• Resolved: 21/Nov/18 13:45

Description

Today we count the actual soft-deletes during a merge which is
unnecessary if there are no hard-deletes present. In this case, which
is considered to be the common case we can get accurate counts by substracting
the number of deleted docs in the wrapped reader from the number of soft-deletes
in that reader.

Issue Links

• links to: GitHub Pull Request #502