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https://issues.apache.org/jira/browse/CASSANDRA-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311999#comment-15311999
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Robert Stupp commented on CASSANDRA-11935:
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Java-UDFs get compiled from generated Java source. So the cost for that is one
object for the UDF, one class plus a bunch of objects for management.
Compiling code is an expensive operation - but if you know what you want (e.g.
build an "add(bigint, varint)") it's easier to just generate the byte code
since it's a fixed pattern. These generated functions would not need any
security checks or sandbox either. Just an idea - not a real proposal.
But yea, generating one "physical" function (like {{add(bigint,varint)}}) for
each combination of types for a "logical" function (like {{+}}/{{add}}) is
probably too complicated. Maybe it's easier to extend the
function-resolve-mechanism and make it able to dispatch calls against methods
in a class like {{AddFunctions}} that contains all the combinations. That
{{AddFunctions}} class could be generated, as it looks easier to test it than
to code every argument type combination manually.
> 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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