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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5715) CAS on 'primary key only' table
Date Mon, 01 Jul 2013 08:41:19 GMT
Sylvain Lebresne created CASSANDRA-5715:
-------------------------------------------

             Summary: CAS on 'primary key only' table
                 Key: CASSANDRA-5715
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5715
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Sylvain Lebresne
            Priority: Minor


Given a table with only a primary key, like
{noformat}
CREATE TABLE test (k int PRIMARY KEY)
{noformat}
there is currently no way to CAS a row in that table into existing because:
# INSERT doesn't currently support IF
# UPDATE has no way to update such table

So we should probably allow IF conditions on INSERT statements.

In addition (or alternatively), we could work on allowing UPDATE to update such table. One
motivation for that could be to make UPDATE always be more general to INSERT. That is currently,
there is a bunch of operation that INSERT cannot do (counter increments, collection appends),
but that "primary key table" case is, afaik, the only case where you *need* to use INSERT.
However, because CQL forces segregation of PK value to the WHERE clause and not to the SET
one, the only syntax that I can see work would be:
{noformat}
UPDATE WHERE k=0;
{noformat}
which maybe is too ugly to allow?

 

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