HeteroVector
get_row(size_type row_num, const std::array<const char *, N> col_names) const;
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It returns the data in row row_num for columns in col_names. The order of data items in the returned vector is the same as order of columns on col_names.
The first item in the returned vector is always the index value
corresponding to the row_num
It returns a HeteroVector which contains a different type for each column.
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N: Size of col_names and values array
Ts: The list of types for all columns. A type should be specified only once.
row_num: The row number
col_names: Names of columns to get data from. It also specifies the order of data in the returned vector
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