r"""Return a :class:`.MapperOption` that will indicate to the :class:`_query.Query` that the main table has been aliased.
(alias: Union[Alias, Subquery])
| 88 | enable_warnings=False, # AliasOption itself warns |
| 89 | ) |
| 90 | def contains_alias(alias: Union[Alias, Subquery]) -> AliasOption: |
| 91 | r"""Return a :class:`.MapperOption` that will indicate to the |
| 92 | :class:`_query.Query` |
| 93 | that the main table has been aliased. |
| 94 | |
| 95 | """ |
| 96 | return AliasOption(alias) |
| 97 | |
| 98 | |
| 99 | def mapped_column( |