Add support for lists of primitives to Pig schema converter

[asfimport]

Right now lists of primitives are not supported in Pig (exception thrown from the PigSchemaConverter.java, line 292 in Parquet 1.6).

Patch converts Parquet-arrays of primitives into Pig-bags, the closest representation of an array in Pig.

Reporter: Christian Rolf / @ccrolf

Original Issue Attachments:

• PigPrimitiveList.patch
• PigPrimitiveList-1.8.patch

_{Note: This issue was originally created as PARQUET-266. Please see the migration documentation for further details.}

[asfimport]

Christian Rolf / @ccrolf:
Patch for current master

[asfimport]

Ryan Blue / @rdblue:
@danielcweeks or @julienledem, you guys are the reviewers for Pig patches, right?

[asfimport]

Daniel Weeks / @danielcweeks:
I can take a look.

[asfimport]

Daniel Weeks / @danielcweeks:
Patch looks good to me (reviewed, builds, tests pass, and verified with real data against 1.7.0), but it doesn't cleanly apply to the current master. @ccrolf could you update the patch (or possibly issue a pull request through github)?

Thanks.

[asfimport]

Christian Rolf / @ccrolf:
Hi Daniel, thanks for the review! Created a PR on github: #209

[asfimport]

Daniel Weeks / @danielcweeks:
Issue resolved by pull request 209
#209

[asfimport]

Daniel Weeks / @danielcweeks:
Thanks @ccrolf for the contribution!