Accoding to http://docs.datastax.com/en/cql/3.1/cql/ddl/ddl_when_use_ index_c.html#concept_ds_sgh_yzz_zj__upDatIndx
> Cassandra stores tombstones in the index until the tombstone limit reaches 100K cells. After exceeding the tombstone limit, the query that uses the indexed value will fail. 1- Is this rule is same for updating a column that is cluster column for a materialized view? 2- Is is bad idea to set a frequency updated column as cluster column for a materialized view? If yes what is the alternative solution? If no , why no?
