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https://issues.apache.org/jira/browse/PIG-1526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gerrit Jansen van Vuuren updated PIG-1526:
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Status: Patch Available (was: Open)
Tags: PIG-1526.patch
> HiveColumnarLoader Partitioning Support
> ---------------------------------------
>
> Key: PIG-1526
> URL: https://issues.apache.org/jira/browse/PIG-1526
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.8.0
> Reporter: Gerrit Jansen van Vuuren
> Assignee: Gerrit Jansen van Vuuren
> Fix For: 0.8.0
>
> Attachments: PIG-1526.patch
>
>
> I've made allot improvements on the HiveColumnarLoader:
> -> Added support for LoadMetadata and data path Partitioning
> -> Improved and simplefied column loading
> Data Path Partitioning:
> Hive stores partitions as folders like to
> /mytable/partition1=[value]/partition2=[value]. That is the table mytable
> contains 2 partitions [partition1, partition2].
> The HiveColumnarLoader will scan the inputpath /mytable and add to the
> PigSchema the columns partition2 and partition2.
> These columns can then be used in filtering.
> For example: We've got year,month,day,hour partitions in our data uploads.
> So a table might look like mytable/year=2010/month=02/day=01.
> Loading with the HiveColumnarLoader allows our pig scripts do filter by date
> using the standard pig Filter operator.
> I've added 2 classes for this:
> -> PathPartitioner
> -> PathPartitionHelper
> These classes are not hive dependent and could be used by any other loader
> that wants to support partitioning and helps with implementing the
> LoadMetadata interface.
> For this reason I though it best to put it into the package
> org.apache.pig.piggybank.storage.partition.
> What would be nice is in the future have the PigStorage also use these 2
> classes to provide automatic path partitioning support.
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