public int getArity() {
        return arity;
    }
This class contains the configured options for predicate indexes.
The adjusted bounds are extended to the nearest power of the arity (-1)
and are used to generate more efficient indexes.

@author Magnar Nedland
@author bjorncs
predicate-search-core/src/main/java/com/yahoo/search/predicate/optimization/PredicateOptions.java