template<size_t N, typename ... Ts>
void
shuffle(const std::array<const char *, N> col_names, bool also_shuffle_index);
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It randomly shuffles the named column(s) non-deterministically.
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also_shuffle_index: If true, it shuffles the named column(s) and the index column. Otherwise, index is not shuffled.
N: Number of named columns
Ts: The list of types for all columns. A type should be specified only once.
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