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Russell Jurney commented on PIG-1748:
-------------------------------------
I've attached a patch that fixes a bug I ran into in serializing bags of tuples.
> Add load/store function AvroStorage for avro data
> -------------------------------------------------
>
> Key: PIG-1748
> URL: https://issues.apache.org/jira/browse/PIG-1748
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Reporter: lin guo
> Assignee: lin guo
> Fix For: 0.9.0
>
> Attachments: AvroStorageUtils-bagfix.patch, PIG-1748-2.patch, PIG-1748-3.patch,
avro_storage.patch, avro_test_files.tar.gz
>
>
> We want to use Pig to process arbitrary Avro data and store results as Avro files. AvroStorage()
extends two PigFuncs: LoadFunc and StoreFunc.
> Due to discrepancies of Avro and Pig data models, AvroStorage has:
> 1. Limited support for "record": we do not support recursively defined record because
the number of fields in such records is data dependent.
> 2. Limited support for "union": we only accept nullable union like ["null", "some-type"].
> For simplicity, we also make the following assumptions:
> If the input directory is a leaf directory, then we assume Avro data files in it have
the same schema;
> If the input directory contains sub-directories, then we assume Avro data files in all
sub-directories have the same schema.
> AvroStorage takes no input parameters when used as a LoadFunc (except for "debug [debug-level]").
> Users can provide parameters to AvroStorage when used as a StoreFunc. If they don't,
Avro schema of output data is derived from its
> Pig schema.
> Detailed documentation can be found in http://linkedin.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data
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