[LUCENE-10014] docvalue writeBlock gcd encode improve

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0, 8.10
• Component/s: core/codecs
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: weizijun
• Created: 23/Jun/21 07:32
• Updated: 28/Aug/22 16:23
• Resolved: 16/Aug/21 13:15

Description

Lucene90DocValuesConsumer.writeBlock calculate bitsPerValue  as:

final int bitsPerValue = DirectWriter.unsignedBitsRequired(max - min);

 it can use gcd in this place as:

(max - min) / gcd