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From "Matt Frantz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TINKERPOP3-761) Some basic mathematical functions / steps
Date Tue, 04 Aug 2015 00:16:05 GMT

    [ https://issues.apache.org/jira/browse/TINKERPOP3-761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652834#comment-14652834
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Matt Frantz commented on TINKERPOP3-761:
----------------------------------------

The use of strings as variable names with definitions given using your proposed {{with}} clauses
seems the most general.  The default interpretation of those strings would be as a symbol
name.  String literals would be {{with('x', constant('x'))}} or by using a {{StringLiteral}}
subclass of {{String}}, e.g. {{StringLiteral.of('x')}}.

It seems that {{select...with}} is a bit more scalable than {{select...by}} for a large number
of items.  Maintaining the parallel list of {{by}} clauses incorrectly can lead to subtle
bugs.

I wonder if it also solves TINKERPOP3-655 because you could say something like {{with('x',
variable)}}.  You would build variables that would be used as placeholders as described there.


> Some basic mathematical functions / steps
> -----------------------------------------
>
>                 Key: TINKERPOP3-761
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-761
>             Project: TinkerPop 3
>          Issue Type: Improvement
>          Components: process
>    Affects Versions: 3.0.0-incubating
>            Reporter: Daniel Kuppitz
>            Assignee: Marko A. Rodriguez
>
> Every once in a while I wish to have steps for some basic mathematical operations ({{add()}},
{{sub()}}, {{mul()}}, {{div()}}). Since {{sub(num)}} is the same as {{add(-num)}} and {{div(num)}}
is the same as {{mul(1/num)}}, we would only need two new step implementations.
> Oh, and then there's also {{mod()}}, thus 3 new step implementations.



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