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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11935) Add support for arithmetic operators
Date Fri, 18 Nov 2016 13:53:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15676762#comment-15676762
] 

Sylvain Lebresne commented on CASSANDRA-11935:
----------------------------------------------

bq. I do not think that there is a conflict with the prefered type here.

There is a conflict in principle in the sense that if you have {{d = 3 + 4}} where {{d}} is
a {{bigint}}, then the new rule would lead you to pick {{bigint add(bigint, bigint)}} while
the prefered type suggests {{bigint add(int, int)}}. Don't get me wrong, both choice happens
to be fine and the code pick a choice. It's more of a general remark that having intersecting
and pretty special rules doesn't give me the feel of a clean and well understood type system,
which give me slight concerns that some of those rules may prove annoying in future developments.

But I suppose it's not a terribly precise comment, it doesn't seem we're going anywhere, and
as I don't a concrete issue with the current patch, +1.


> Add support for arithmetic operators
> ------------------------------------
>
>                 Key: CASSANDRA-11935
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11935
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: CQL
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>             Fix For: 3.x
>
>
> The goal of this ticket is to add support for arithmetic operators:
> * {{-}}: Change the sign of the argument
> * {{+}}: Addition operator
> * {{-}}: Minus operator
> * {{*}}: Multiplication operator
> * {{/}}: Division operator
> * {{%}}: Modulo operator
> This ticket we should focus on adding operator only for numeric types to keep the scope
as small as possible. Dates and string operations will be adressed in follow up tickets.
> The operation precedence should be:
> # {{*}}, {{/}}, {{%}}
> # {{+}}, {{-}}
> Some implicit data conversion should be performed when operations are performed on different
types (e.g. double + int).



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