The information about field to be selected if the field is an array or an alias is used.
The alias to be used instead of field name, it can be a more self explanatory name than that used in the database table.
The field extent index, for array fields. If set the select will return only that specific value from an array field.
The field name to select.
The information about field to be selected if the field is an array or an alias is used.