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Date: Wed, 21 Sep 2016 13:25:20 +0000 (UTC)
From: "Alex Petrov (JIRA)" <jira@apache.org>
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Subject: [jira] [Comment Edited] (CASSANDRA-12232) Add +=/-= shortcut syntax
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archived-at: Wed, 21 Sep 2016 13:25:22 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509894#comment-15509894 ] 

Alex Petrov edited comment on CASSANDRA-12232 at 9/21/16 1:24 PM:
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As a bonus, we're getting shortcut syntax for counters as well "for free". I've covered this path with tests as well. 

|[trunk|https://github.com/ifesdjeen/cassandra/tree/12232-trunk] |[utest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-12232-trunk-testall/] |[dtest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-12232-trunk-dtest/] | 


was (Author: ifesdjeen):
As a bonus, we're getting shortcut syntax for counters as well "for free". I've covered this path with tests as well. 

|[trunk|https://github.com/ifesdjeen/cassandra/tree/12232-trunk] |[utest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-12232-trunk-testall/] |[dtest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-12232-trunk-dtest/] | ]

> Add +=/-= shortcut syntax
> -------------------------
>
>                 Key: CASSANDRA-12232
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12232
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Sylvain Lebresne
>            Assignee: Alex Petrov
>            Priority: Minor
>
> For collections and counters, the current syntax to add/remove elements is:
> {noformat}
> UPDATE foo SET myCollection = myCollection + ...;
> {noformat}
> which is fine, though it's already tad annoying to have to repeat {{myCollection}}. 
> But moving forward, with tickets CASSANDRA-7826, we'll start being able to add to nested collections and we'll end up with queries like:
> {noformat}
> UPDATE foo SET myCollection['someElement']['otherElemnt'] = myCollection['someElement']['otherElemnt'] + ...;
> {noformat}
> where the repetition is starting to be really annoying and it makes the query less readable.
> It's trivial however to add a {{+=}}/{{-=}} shortcut syntax which would read instead:
> {noformat}
> UPDATE foo SET myCollection['someElement']['otherElemnt'] += ...;
> {noformat}
> As this would just be syntactic sugar, it only requires a few minor addition to the grammar and this would be completely optional: if some users prefer the verbose syntax, that's fine.
> Also note that while this will be even more useful after things like CASSANDRA-7826, it's already a nice to have today so it's not dependent on that latter ticket in any way.


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