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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5633) CQL support for updating multiple rows in a partition using CAS
Date Thu, 13 Jun 2013 18:17:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682496#comment-13682496
] 

Jonathan Ellis edited comment on CASSANDRA-5633 at 6/13/13 6:16 PM:
--------------------------------------------------------------------

How about this?

{code}
UPDATE foo SET x = 10 WHERE partition='key' AND bar=1
IF (SELECT y FROM foo WHERE partition='key' AND baz = 2) = 3
{code}

Pro:
# Good match with semantics of what CAS actually does under the hood
# Fairly natural for SQL users

Con:
# Need to invent syntax for multiple columns ({{IF (SELECT y, z ...) = (3, 4)}})
# Risks confusing people who wonder why we don't support subqueries elsewhere
# Not necessarily obvious that subquery is restricted to the same partition
                
      was (Author: jbellis):
    How about this?

{code}
UPDATE foo SET x = 10 WHERE bar = 1
IF (SELECT y FROM foo WHERE baz = 2) = 3
{code}

Pro:
# Good match with semantics of what CAS actually does under the hood
# Fairly natural for SQL users

Con:
# Need to invent syntax for multiple columns ({{IF (SELECT y, z ...) = (3, 4)}})
# Risks confusing people who wonder why we don't support subqueries elsewhere
                  
> CQL support for updating multiple rows in a partition using CAS
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-5633
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5633
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 2.0
>            Reporter: sankalp kohli
>            Priority: Minor
>              Labels: cql3
>             Fix For: 2.0
>
>
> This is currently supported via Thrift but not via CQL. 

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