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https://issues.apache.org/jira/browse/CASSANDRA-194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711951#action_12711951
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Jun Rao commented on CASSANDRA-194:
-----------------------------------
Actually, most of the existing APIs on Standard CF already used Column index.
The only exceptions are get_slice and get_column_count. For get_slice, we can
actually convert it to a get_slice_from call with an empty starting column.
This avoids a full scan of all columns.
Also, there doesn't seem to be an index at sub-column level, so all sub-columns
have to be scanned for APIs like get_column on a super CF. I am not sure if
it's worthwhile to have three levels of indexes (i.e, key, column, sub-column)
though.
> Indexed reads for the rest of the API
> -------------------------------------
>
> Key: CASSANDRA-194
> URL: https://issues.apache.org/jira/browse/CASSANDRA-194
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Fix For: 0.4
>
>
> Jun Rao started this in CASSANDRA-172; we need to do this for the rest of the
> API so we can have millions of columns instead of merely thousands.
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