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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/06/13 20:17:20 UTC
[jira] [Comment Edited] (CASSANDRA-5633) CQL support for updating
multiple rows in a partition using CAS
[ 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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