check most recent TS values in SSTables when a row tombstone has already been
encountered
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Key: CASSANDRA-4116
URL: https://issues.apache.org/jira/browse/CASSANDRA-4116
Project: Cassandra
Issue Type: Bug
Reporter: Matthew F. Dennis
once C* comes across a row tombstone, C* should check the TS on the tombstone
against all SSTables. If the most recent TS in an SST is older than the row
tombstone, that entire SST (or the remainder of it) can be safely ignored.
There are two drivers for this.
* avoid checking column values that could not possibly be in the result set
* avoid OOMing because all the tombstones are temporarily kept in memory.
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