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https://issues.apache.org/jira/browse/LUCENE-2232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804228#action_12804228
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Paul Elschot commented on LUCENE-2232:
--------------------------------------
>From at LUCENE-1410, yesterday 23 Jan 2010:
{quote}
(Zhang, 2008) The poor speed of variable- byte on position data is primarily due
to the fact that position values are larger and more often require
2 bytes under variable-byte; this case tends to be much slower due
to a branch mispredict.
{quote}
So using VShort (1 bit as in VByte and 15 bits data) should speed up the
proximity decoding when compared to the current VByte encoding (1 bit flag, 7
bits data).
The disadvantage is a larger size of the proximity file. When only small
document fields are present, the proximity file would double in size. For
larger documents fields about 5-6% size increase is expected, see for example
the prx statistics posted at LUCENE-1410.
> Use VShort to encode positions
> ------------------------------
>
> Key: LUCENE-2232
> URL: https://issues.apache.org/jira/browse/LUCENE-2232
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Paul Elschot
>
> Improve decoding speed for typical case of two bytes for a delta position at
> the cost of increasing the size of the proximity file.
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