Transpose positions in index
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Key: LUCENE-3325
URL: https://issues.apache.org/jira/browse/LUCENE-3325
Project: Lucene - Java
Issue Type: Wish
Components: core/index
Reporter: Paul Elschot
Priority: Minor
When positions are used in queries with many terms, each term in each document
causes a seek in the positions, and in large indexes these seeks can be far
apart even when the terms are in the same document.
The number of (disk) cache misses of such position seeks might be reduced by
putting the positions for all terms in the same document directly behind each
other. This should have a noticable effect when terms are alphabetically close,
for example for truncations, and it should also help when the documents have
few enough positions to fill a cache entry (disk page, cache line).
This might also help the performance of highlighting based on indexed positions.
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