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From Yiming Sun <>
Subject yet a couple more questions on composite columns
Date Fri, 03 Feb 2012 21:21:45 GMT

We are getting close to replacing our super-column based schema to
something more efficient, and I am trying to wrap my heads around composite

An email from another list member has clarified that composite and
non-composite columns should not be mixed in the same CF because only one
comparator is used for all columns.  Does this also mean all composite
columns within the same CF must be homogeneous types?  and I cannot have
one composite column name with 3 components while another with 4 components?

Another question I have is how flexible composite columns actually are.  If
my data model has a CF containing US zip codes with the following composite

{OH:Spring Field} : 45503
{OH:Columbus} : 43085
{FL:Spring Field} : 32401
{FL:Key West}  : 33040

I know I can ask cassandra to "give me the zip codes of all cities in OH".
 But can I ask it to "give me the zip codes of all cities named Spring
Field" using this model?  Thanks.

-- Y.

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