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Jul 19, 2012, 4:59 PM
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[jira] [Created] (LUCENE-4239) Provide access to PackedInts' low-level blocks <-> values conversion methods
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Adrien Grand created LUCENE-4239:
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Summary: Provide access to PackedInts' low-level blocks <-> values conversion methods
Key: LUCENE-4239
URL: https://issues.apache.org/jira/browse/LUCENE-4239
Project: Lucene - Java
Issue Type: Improvement
Components: core/other
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
Fix For: 4.0
In LUCENE-4161 we started to make the {{PackedInts}} API more flexible so that codecs could use it whenever they need to (un)pack integers. There are two posting formats in progress (For and PFor, LUCENE-3892) that perform a lot of integer (un)packing but the current API still has limits :
- it only works with long[] arrays, whereas these codecs need to manipulate int[] arrays,
- the packed reader iterators work great for unpacking long sequences of integers, but they would probably cause a lot of overhead to decode lots of short integer sequences such as the ones that can be generated by For and PFor.
I've been looking at the For/PFor branch and it has a {{PackedIntsDecompress}} class (http://svn.apache.org/repos/asf/lucene/dev/branches/pforcodec_3892/lucene/core/src/java/org/apache/lucene/codecs/pfor/PackedIntsDecompress.java) which is very similar to {{oal.util.packed.BulkOperation}} (package-private), so maybe we should find a way to expose this class so that the For/PFor branch can directly use it.
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