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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6875) CQL3: select multiple CQL rows in a single partition using IN
Date Mon, 17 Mar 2014 17:41:43 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-6875:
----------------------------------------

    Assignee: Tyler Hobbs

> CQL3: select multiple CQL rows in a single partition using IN
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-6875
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6875
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>            Reporter: Nicolas Favre-Felix
>            Assignee: Tyler Hobbs
>
> In the spirit of CASSANDRA-4851 and to bring CQL to parity with Thrift, it is important
to support reading several distinct CQL rows from a given partition using a distinct set of
"coordinates" for these rows within the partition.
> CASSANDRA-4851 introduced a range scan over the multi-dimensional space of clustering
keys. We also need to support a "multi-get" of CQL rows, potentially using the "IN" keyword
to define a set of clustering keys to fetch at once.
> (reusing the same example\:)
> Consider the following table:
> {code}
> CREATE TABLE test (
>   k int,
>   c1 int,
>   c2 int,
>   PRIMARY KEY (k, c1, c2)
> );
> {code}
> with the following data:
> {code}
>  k | c1 | c2
> ---+----+----
>  0 |  0 |  0
>  0 |  0 |  1
>  0 |  1 |  0
>  0 |  1 |  1
> {code}
> We can fetch a single row or a range of rows, but not a set of them:
> {code}
> > SELECT * FROM test WHERE k = 0 AND (c1, c2) IN ((0, 0), (1,1)) ;
> Bad Request: line 1:54 missing EOF at ','
> {code}
> Supporting this syntax would return:
> {code}
>  k | c1 | c2
> ---+----+----
>  0 |  0 |  0
>  0 |  1 |  1
> {code}
> Being able to fetch these two CQL rows in a single read is important to maintain partition-level
isolation.



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