Add Dictionary Based Filtering to Filter2 API

[asfimport]

Dictionary based predicate evaluation show very significant gains for certain cases like the following:

• Sparse values in dictionary encoded columns
• Data staged sorted by fields used in predicate evaluation

This would be good to introduce into the filter2 API.

Reporter: Daniel Weeks / @danielcweeks
Assignee: Daniel Weeks / @danielcweeks

Related issues:

• Release Parquet-mr 1.9.0 (blocks)
• Add Java metadata for PageEncodingStats (relates to)
• Add api to read dictionary from each column chunk for predicate pushdown (supercedes)

PRs and other links:

• PR #330

_{Note: This issue was originally created as PARQUET-384. Please see the migration documentation for further details.}

[asfimport]

Daniel Weeks / @danielcweeks:
#286

@isnotinvain Can you take a look at the changes I made to accommodate the dictionary filter?

[asfimport]

Ryan Blue / @rdblue:
I submitted an updated PR, #330.

[asfimport]

Daniel Weeks / @danielcweeks:
This now includes the api for reading dictionaries and supersedes PARQUET-374.

[asfimport]

Ryan Blue / @rdblue:
Merged #330. Thanks for reviewing, Dan!