keep persistent row statistics
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Key: CASSANDRA-1155
URL: https://issues.apache.org/jira/browse/CASSANDRA-1155
Project: Cassandra
Issue Type: Sub-task
Components: Core
Reporter: Jonathan Ellis
Fix For: 0.7
during flush and compaction we should keep row size statistics using
EstimatedHistogram (column count, and row size), replacing min/max/total sizes
in CFS.
having this detail will let us estimate, given an index CF, how many nodes we
need to query to get the number of matching rows requested by the client.
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