Adrien Grand created LUCENE-4946:
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Summary: Refactor SorterTemplate
Key: LUCENE-4946
URL: https://issues.apache.org/jira/browse/LUCENE-4946
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Trivial
When working on TimSort (LUCENE-4839), I was a little frustrated of not being
able to add galloping support because it would have required to add new
primitive operations in addition to compare and swap.
I started working on a prototype that uses inheritance to allow some sorting
algorithms to rely on additional primitive operations. You can have a look at
https://github.com/jpountz/sorts/tree/master/src/java/net/jpountz/sorts (but
beware it is a prototype and still misses proper documentation and good tests).
I think it would offer several advantages:
- no more need to implement setPivot and comparePivot when using in-place
merge sort or insertion sort,
- the ability to use faster stable sorting algorithms at the cost of some
memory overhead (our in-place merge sort is very slow),
- the ability to implement properly algorithms that are useful on specific
datasets but require different primitive operations (such as TimSort for
partially-sorted data).
If you are interested in comparing these implementations with Arrays.sort,
there is a Benchmark class in src/examples.
What do you think?
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