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Benedict commented on CASSANDRA-7688:
-------------------------------------
I'm talking about estimates. We cannot likely even estimate without pretty
significant cost. Sampling column counts is pretty easy, but knowing how many
cql rows there are for any merged row is not. There are tricks to make it
easier, but there are datasets for which the tricks will not work, and any
estimate would be complete guesswork without sampling the data.
> Add data sizing to a system table
> ---------------------------------
>
> Key: CASSANDRA-7688
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7688
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jeremiah Jordan
> Fix For: 2.1.3
>
>
> Currently you can't implement something similar to describe_splits_ex purely
> from the a native protocol driver.
> https://datastax-oss.atlassian.net/browse/JAVA-312 is open to expose easily
> getting ownership information to a client in the java-driver. But you still
> need the data sizing part to get splits of a given size. We should add the
> sizing information to a system table so that native clients can get to it.
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