field() lets you create an arrow::Field that maps a
DataType to a column name. Fields are contained in
Schemas.
field(name, type, metadata)
| name | field name |
|---|---|
| type | logical type, instance of DataType |
| metadata | currently ignored |
f$ToString(): convert to a string
f$Equals(other): test for equality. More naturally called as f == other
#> Field #> x: int32