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https://issues.apache.org/jira/browse/PHOENIX-2536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15308904#comment-15308904
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Sergey Soldatov commented on PHOENIX-2536:
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It's not clear what to do if one operand is exact numeric and second is
approximate numeric.
So, if we add integer and float. Checked with mysql - the result is double. And
it seems reasonable.
[~kliew], [~elserj] any thoughts?
> Return of aggregation functions do not have the correct data type and
> precision
> -------------------------------------------------------------------------------
>
> Key: PHOENIX-2536
> URL: https://issues.apache.org/jira/browse/PHOENIX-2536
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.6.0
> Reporter: Kevin Liew
> Assignee: Sergey Soldatov
> Labels: function, phoenix
> Fix For: 4.8.0
>
>
> ANSI SQL specifies that
> {quote}If SUM is specified and DT is exact numeric with scale
> S, then the data type of the result is exact numeric with
> implementation-defined precision and scale S.
> ...
> If DT is approximate numeric, then the data type of the
> result is approximate numeric with implementation-defined
> precision not less than the precision of DT.{quote}
> However, when summing integer types (first operand) with float or double
> (second operand), Phoenix returns the value with the same data type as the
> first operand.
> Doing a sum with the first operand being a FLOAT or DOUBLE will return a
> DECIMAL with a fixed scale of 4.
> Doing any multiplication or division will also result in a DECIMAL with scale
> 4.
> In all of the cases outlined above, the return data type does not meet the
> ANSI standard.
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