@Override
    protected void onMerge(AggregationResult result) {
        xor = xor ^ ((XorAggregationResult)result).xor;
    }
Sets the current xor value.

@param xor The value to set.
@return This, to allow chaining.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/XorAggregationResult.java