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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