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DRILL-3492: Add support for encoding/decoding of 'double' to/from OrderedBytes format

Review Request #36558 - Created July 16, 2015 and updated - Latest diff uploaded

Information
Smidth Panchamia
drill-git
master
DRILL-3492
Reviewers
drill-git
aditya 
This change allows encoding/decoding of data from Double data type to OrderedBytes format.

The following JIRA added the OrderedBytes encoding to HBase: https://issues.apache.org/jira/browse/HBASE-8201


This encoding scheme will preserve the sort-order of the native data-type when it is stored as sorted byte arrays on disk.

Thus, it will help the HBase storage plugin if the row-keys have been encoded in OrderedBytes format.


This functionality allows us to prune the scan ranges, thus reading much lesser data from the server.
Added a new unit-test class TestOrderedBytesConvertFunctions.java which derives from TestConvertFunctions.java class.

This tests the sanity of the OrderedBytesDoubleConvert{From|To}.java implementation.


Also, added a new test case to TestHBaseFilterPushDown.java class which checks if the we were able to prune the scan range of the table where the row-key was encoded as OrderedBytes.


All the added tests work as expected.
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