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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7855) Genralize use of IN for compound partition keys
Date Mon, 01 Sep 2014 12:24:22 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14117371#comment-14117371
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Sylvain Lebresne commented on CASSANDRA-7855:
---------------------------------------------

bq. Server side? Or should that be CLIENT side?

Correct, I meant client side, I've fixed that. No need to shout though.

bq. And terminology - this improvement is for "composite partition keys" - "compound" refers
to "primary keys" with clustering columns rather than just the partition key portion of the
primary key.

I don't remenber us ever deciding that "composite partition keys" was *the* terminology for
this, but in any case, I think the ticket description is precise enough to not lead to confusion.



> Genralize use of IN for compound partition keys
> -----------------------------------------------
>
>                 Key: CASSANDRA-7855
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7855
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sylvain Lebresne
>            Priority: Minor
>              Labels: cql
>             Fix For: 2.0.11
>
>
> When you have a compount partition key, we currently only support to have a {{IN}} on
the last column of that partition key. So given:
> {noformat}
> CREATE TABLE foo (
>     k1 int,
>     k2 int,
>     v int,
>     PRIMARY KEY ((k1, k2))
> )
> {noformat}
> we allow
> {noformat}
> SELECT * FROM foo WHERE k1 = 0 AND k2 IN (1, 2)
> {noformat}
> but not
> {noformat}
> SELECT * FROM foo WHERE k1 IN (0, 1) AND k2 IN (1, 2)
> {noformat}
> There is no particular reason for us not supporting the later (to the best of my knowledge)
since it's reasonably straighforward, so we should fix it.
> I'll note that using {{IN}} on a partition key is not necessarily a better idea than
parallelizing queries server client side so this syntax, when introduced, should probably
be used sparingly, but given we do support IN on partition keys, I see no reason not to extend
it to compound PK properly.



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