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Date: Mon, 27 Jun 2016 15:38:52 +0000 (UTC)
From: "Sam Tunnicliffe (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Updated] (CASSANDRA-10214) Enable index selection to be
 overridden on a per query basis
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archived-at: Mon, 27 Jun 2016 15:38:54 -0000


     [ https://issues.apache.org/jira/browse/CASSANDRA-10214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sam Tunnicliffe updated CASSANDRA-10214:
----------------------------------------
    Assignee:     (was: Sam Tunnicliffe)

> Enable index selection to be overridden on a per query basis
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-10214
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10214
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: CQL
>            Reporter: Sam Tunnicliffe
>             Fix For: 3.x
>
>
> (Broken out of CASSANDRA-10124)
> We could add a {{USING INDEX <indexname>}} clause to {{SELECT}} syntax to force the choice of index and bypass the usual index selection mechanism.
> {code}
> CREATE TABLE ks.t1(k int, v1 int, v2 int, PRIMARY KEY (k));
> CREATE INDEX v1_idx ON ks.t1(v1);
> CREATE INDEX v2_idx ON ks.t1(v2);
> CREATE CUSTOM INDEX v1_v2_idx ON ks.t1(v1, v2) USING 'com.foo.bar.CustomMultiColumnIndex';
> # Override internal index selection mechanism
> SELECT * FROM ks.t1 WHERE v1=0 AND v2=0 USING INDEX v1_idx;
> SELECT * FROM ks.t1 WHERE v1=0 AND v2=0 USING INDEX v2_idx;
> SELECT * FROM ks.t1 WHERE v1=0 AND v2=0 USING INDEX v1_v2_idx;
> {code}
> This is in some ways similar to [index hinting|http://docs.oracle.com/cd/B19306_01/server.102/b14211/hintsref.htm#CHDJDIAH] in Oracle. 
> edit: fixed typo's (missing INDEX in the USING clauses)



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