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From Sylvain Lebresne <>
Subject Re: Composite Column Types Storage
Date Tue, 18 Sep 2012 11:17:18 GMT
> Range queries do not use bloom filters. It holds good for composite-columns
> also right?

Since I assume you are referring to column's bloom filters (key's bloom filters
are always used) then yes, that holds good for composite columns. Currently,
composite column name are completely opaque to the storage engine.

> <Column-part-1> alone could have gone into the bloom-filter, speeding up my
> queries really effectively

True, though (in 1.2 only
however) should help quite a lot here. Basically it will allow to skip the
sstable based on the column index. Granted, this is less fined grained than a
bloom filter (though on the other side there is no false positive), but I
suspect that in most real life workload it won't be too much worse.


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