templat<typename T, typename I = unsigned long, typename = typename std::enable_if<std::is_arithmetic<T>::value, T>::type>
struct MedianVisitor;
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This is a “single action visitor”, meaning it is passed the whole data vector in one call and you must use the single_action_visit() interface.
This functor class finds the median of the given column, using the above Kth element visitor. It computes in linear time.
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T: Column data type
I: Index type
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