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https://issues.apache.org/jira/browse/HIVE-1721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241517#comment-13241517
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Mikalai Parafeniuk commented on HIVE-1721:
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Hello.
I am Mikalaj Parafeniuk from Belarussian State University. I'm a third year
student and I'm looking for a project to contribute in terms of GSoC 2012.
I have already learned a basics about bloom filters from the internet and
usefull links from this thread. But i need some further reading. Could you
propose some? Also i need to learn Hive codebase. I want to achieve that by
fixing small bugs. Could you give me the idea where can i start?
> use bloom filters to improve the performance of joins
> -----------------------------------------------------
>
> Key: HIVE-1721
> URL: https://issues.apache.org/jira/browse/HIVE-1721
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Labels: gsoc, gsoc2012, optimization
>
> In case of map-joins, it is likely that the big table will not find many
> matching rows from the small table.
> Currently, we perform a hash-map lookup for every row in the big table, which
> can be pretty expensive.
> It might be useful to try out a bloom-filter containing all the elements in
> the small table.
> Each element from the big table is first searched in the bloom filter, and
> only in case of a positive match,
> the small table hash table is explored.
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