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From "Gerrit Jansen van Vuuren (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1117) Pig reading hive columnar rc tables
Date Tue, 22 Dec 2009 17:00:29 GMT

    [ https://issues.apache.org/jira/browse/PIG-1117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793672#action_12793672
] 

Gerrit Jansen van Vuuren commented on PIG-1117:
-----------------------------------------------

Hi, 
Thanks for the review, I've refactored the code abit to include the changes that you've mentioned.

I've decided to convert Byte and Boolean to Int when found. although where I work we haven't
used Byte or Boolean yet.

I'll try to get the diff for the version up tonight.

With the hive dependencies I've made some changes to the build.xml to actually download the
hive tar from there website (only if the hive libs are not already downloaded so this will
only happen once).
This should allows to just type ant hive-jar and the deps are downloaded automatically.

> Pig reading hive columnar rc tables
> -----------------------------------
>
>                 Key: PIG-1117
>                 URL: https://issues.apache.org/jira/browse/PIG-1117
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Gerrit Jansen van Vuuren
>         Attachments: HiveColumnarLoader.patch, HiveColumnarLoaderTest.patch, PIG-1117.patch
>
>
> I've coded a LoadFunc implementation that can read from Hive Columnar RC tables, this
is needed for a project that I'm working on because all our data is stored using the Hive
thrift serialized Columnar RC format. I have looked at the piggy bank but did not find any
implementation that could do this. We've been running it on our cluster for the last week
and have worked out most bugs.
>  
> There are still some improvements to be done but I would need  like setting the amount
of mappers based on date partitioning. Its been optimized so as to read only specific columns
and can churn through a data set almost 8 times faster with this improvement because not all
column data is read.
> I would like to contribute the class to the piggybank can you guide me in what I need
to do?
> I've used hive specific classes to implement this, is it possible to add this to the
piggy bank build ivy for automatic download of the dependencies?

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