datatable
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time64 enhancement
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[x] Suppose there is one column stores time in UNIX epoch with integer type, provide a function that trans this column to time64, something like
pandas.to_datetime -
[ ] When exporting time64 column to csv, provide a format parameter, currently datatable just ignores zeros in microseconds and milliseconds, which is not convient for the parser of other packages.
First request is now implemented via a type cast