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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4361) CQL3: allow definition with only a PK
Date Wed, 20 Jun 2012 16:50:43 GMT
Sylvain Lebresne created CASSANDRA-4361:
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             Summary: CQL3: allow definition with only a PK
                 Key: CASSANDRA-4361
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4361
             Project: Cassandra
          Issue Type: Improvement
          Components: API
            Reporter: Sylvain Lebresne
            Assignee: Sylvain Lebresne
             Fix For: 1.2


Currently, in CQL3 and contrarily to SQL, one cannot define a table having only a PK but no
other columns. Related to that, a CQL always needs at least one column outside of the PK to
be inserted to exist. All that may force people to add 'fake' value that they don't really
need.

The goal of this ticket is to lift that limitation and allow table definition to have only
a PK, and to have CQL rows exist even if only the PK has been inserted (in other words, to
have CQL rows behave like SQL rows).

Following CASSANDRA-4329, one way to do that with the sparse-composite encoding CQL3 uses
would be to insert as marker of the CQL row presence a CQL column with an empty name (the
underlying column name won't be empty though since it's a composite). The drawback though
is that we will need to insert that marker with every insert to the CQL row (in other word,
we'll add a slight overhead to the size of each write). The pros is that if we have such marker
for the CQL row presence, we will be able to reoptimize back queries that select only a few
columns (since following CASSANDRA-3982 we query all columns of a CQL row every time).


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