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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9550) Support fixed precision data type
Date Thu, 04 Jun 2015 18:19:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573311#comment-14573311
] 

Tyler Hobbs commented on CASSANDRA-9550:
----------------------------------------

Right, is there something that the {{decimal}} type isn't sufficient for?

> 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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