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From " Brian Hess (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9550) Support fixed precision data type
Date Thu, 04 Jun 2015 17:57:39 GMT
 Brian Hess created CASSANDRA-9550:
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             Summary: Support fixed precision data type
                 Key: CASSANDRA-9550
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9550
             Project: Cassandra
          Issue Type: Improvement
            Reporter:  Brian Hess


SQL databases support a fixed precision data type.  When converting data models from SQL DBs
to Cassandra, the choices are not clear.  DOUBLE or FLOAT are possibilities, but with UDFs
and Aggregates this is actually a lot less clear, as you really do need fixed precision arithmetic.
 That is, one flaw with floating-point math is that the order of the operations can change
the final result.  That is not an issue with fixed precision arithmetic (though other trade-offs
are there).



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