Index - O
| offsets | DataFrame.Internal.DataFrame |
| openFileSilently | DataFrame.Display.Web.Plot |
| operations | DataFrame.Lazy.Internal.DataFrame, DataFrame.Lazy |
| OPTIONAL | DataFrame.IO.Parquet.Types |
| OptionalColumn | DataFrame.Internal.Column |
| or | DataFrame.Functions |
| ordinal | DataFrame.IO.Parquet.Thrift |