Matt McCline created HIVE-15335:
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             Summary: Fast Decimal
                 Key: HIVE-15335
                 URL: https://issues.apache.org/jira/browse/HIVE-15335
             Project: Hive
          Issue Type: Bug
          Components: Hive
            Reporter: Matt McCline
            Assignee: Matt McCline
            Priority: Critical


Replace HiveDecimal implementation that currently represents the decimal 
internally as a BigDecimal with a faster version that does not allocate extra 
objects

Replace HiveDecimalWritable implementation with a faster version that has new 
mutable* calls (e.g. mutableAdd, mutableEnforcePrecisionScale, etc) and stores 
the result as a fast decimal instead of a slow byte array containing a 
serialized BigInteger.

Provide faster ways to serialize/deserialize decimals.



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