Add a default range to queries
------------------------------
Key: CASSANDRA-3340
URL: https://issues.apache.org/jira/browse/CASSANDRA-3340
Project: Cassandra
Issue Type: New Feature
Reporter: David Semeria
Priority: Minor
Often we find ourselves having to make two nearly identical queries when in
theory one could suffice.
Assuming we're storing json properites in discrete columns, a typical user row
might look like this:
default:name, default:age,... address:street, address:number,...
contacts:email, contacts,phone, contacts:mobile....
To extract the contacts for a given user we would pass startCol = 'contacts',
endCol = 'contacts' + charAfter(':')
However, we frequently also need to retrieve the properties under the 'default'
key. To do this we currently need to make a second nearly identical query, with
the only difference that startCol and endCol now refer to 'default'
It would be nice if we could pass in a default range along with the standard
range during queries.
It seems inefficient to make Cassandra extract the same row(s) twice, with the
only difference being how they are filtered.
I'm not in a position to estimate how many other users might find this
functionality, all I can say is that we certainly would.
Thanks.
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