| http://www.w3.org/ns/prov#value | - For example, given some query which ORDERs BY more than one column, if there is an index over the leftmost column(s), but not over all the columns, then if we use the index to control the sorting of the columns it is over (i.e. by locking the file in the first join position and accessing rows in the indexed order), then we process until we have matched the first N rows but additionally we must con
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