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From Ted Zlatanov <...@lifelogs.com>
Subject predicate queries (was: bitmap slices)
Date Mon, 01 Feb 2010 18:02:23 GMT
My list of things I need for predicate queries across column and
supercolumn names:

- bitmask (OR AND1 AND2 AND3 ...).  This would make my life easier and
  take load off our Cassandra servers.  Currently I have to scan the
  result sets on the client side to find the things I need.

- date matching on Long supercolumns (find the last Friday, for example;
  the Calendar fields could be a good query language).  This is not so
  important.

FWIW I'd like an entirely text-based query language like SQL with the
whole query in one string, accessible at the top keyspace level and not
requiring other binary types.  Then you don't have to worry about
overengineering it one way or another, it simply supports whatever is
necessary.  You've already got some of the parser written for the
cassandra-cli stuff.

Another approach is to implement a JDBC driver with very limited
query functionality.

Ted


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