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https://issues.apache.org/jira/browse/HIVE-15335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15767775#comment-15767775
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Owen O'Malley commented on HIVE-15335:
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Review comments:
* Thank you for addressing my API compatibility concerns.
* Do you have benchmark numbers for the new and old implementation? It should
be faster, but it is worth looking at the numbers before making such a huge
change to Hive.
* The test cases in storage-api have a lot of commented out printlns, those
should either be removed or converted into LOG.debug.
* The tests in VersionTestBase should provide a message rather than just call
fail().
* There is a commented out fail. That should be removed or uncommented.
* It would be great to have a fast path for decimals where the precision is
less than or equal to 18, that fit into a long. Based on my casual observation
more than 90% of Hive schemas with decimals fit. What would be the right
approach to fit that in as a later patch?
> Fast Decimal
> ------------
>
> Key: HIVE-15335
> URL: https://issues.apache.org/jira/browse/HIVE-15335
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-15335.01.patch, HIVE-15335.02.patch,
> HIVE-15335.03.patch, HIVE-15335.04.patch, HIVE-15335.05.patch,
> HIVE-15335.06.patch, HIVE-15335.07.patch, HIVE-15335.08.patch,
> HIVE-15335.09.patch, HIVE-15335.091.patch, HIVE-15335.092.patch,
> HIVE-15335.093.patch, HIVE-15335.094.patch, HIVE-15335.095.patch,
> HIVE-15335.096.patch, HIVE-15335.097.patch, HIVE-15335.098.patch,
> HIVE-15335.099.patch, HIVE-15335.0991.patch
>
>
> Replace HiveDecimal implementation that currently represents the decimal
> internally as a BigDecimal with a faster version that does not allocate extra
> objects
> Replace HiveDecimalWritable implementation with a faster version that has new
> mutable* calls (e.g. mutableAdd, mutableEnforcePrecisionScale, etc) and
> stores the result as a fast decimal instead of a slow byte array containing a
> serialized BigInteger.
> Provide faster ways to serialize/deserialize decimals.
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