we can easy to get ColumnMap or ColumnArray , but when we cast ColumnMap or ColumnArray to Column , the trouble coming .
here is the trouble
wo can cast Column back to ColumnMap or ColumnArray , but we do not know the exact basic type (at lease now),because we can't convet ColumnMap to ColumnTuple , so we can't create a ColumnMap or ColumnArray from column dynamically
we can easy to get ColumnMap or ColumnArray , but when we cast ColumnMap or ColumnArray to Column , the trouble coming .
here is the trouble
wo can cast Column back to ColumnMap or ColumnArray , but we do not know the exact basic type (at lease now),because we can't convet ColumnMap to ColumnTuple , so we can't create a ColumnMap or ColumnArray from column dynamically