(
self,
*whens: Union[
typing_Tuple[_ColumnExpressionArgument[bool], Any],
Mapping[Any, Any],
],
value: Optional[Any] = None,
else_: Optional[Any] = None,
)
| 3337 | value: Optional[ColumnElement[Any]] |
| 3338 | |
| 3339 | def __init__( |
| 3340 | self, |
| 3341 | *whens: Union[ |
| 3342 | typing_Tuple[_ColumnExpressionArgument[bool], Any], |
| 3343 | Mapping[Any, Any], |
| 3344 | ], |
| 3345 | value: Optional[Any] = None, |
| 3346 | else_: Optional[Any] = None, |
| 3347 | ): |
| 3348 | new_whens: Iterable[Any] = coercions._expression_collection_was_a_list( |
| 3349 | "whens", "case", whens |
| 3350 | ) |
| 3351 | try: |
| 3352 | new_whens = util.dictlike_iteritems(new_whens) |
| 3353 | except TypeError: |
| 3354 | pass |
| 3355 | |
| 3356 | self.whens = [ |
| 3357 | ( |
| 3358 | coercions.expect( |
| 3359 | roles.ExpressionElementRole, |
| 3360 | c, |
| 3361 | apply_propagate_attrs=self, |
| 3362 | ).self_group(), |
| 3363 | coercions.expect(roles.ExpressionElementRole, r), |
| 3364 | ) |
| 3365 | for (c, r) in new_whens |
| 3366 | ] |
| 3367 | |
| 3368 | if value is None: |
| 3369 | self.value = None |
| 3370 | else: |
| 3371 | self.value = coercions.expect(roles.ExpressionElementRole, value) |
| 3372 | |
| 3373 | if else_ is not None: |
| 3374 | self.else_ = coercions.expect(roles.ExpressionElementRole, else_) |
| 3375 | else: |
| 3376 | self.else_ = None |
| 3377 | |
| 3378 | type_ = next( |
| 3379 | ( |
| 3380 | then.type |
| 3381 | # Iterate `whens` in reverse to match previous behaviour |
| 3382 | # where type of final element took priority |
| 3383 | for *_, then in reversed(self.whens) |
| 3384 | if not then.type._isnull |
| 3385 | ), |
| 3386 | self.else_.type if self.else_ is not None else type_api.NULLTYPE, |
| 3387 | ) |
| 3388 | self.type = cast(_T, type_) |
| 3389 | |
| 3390 | @util.ro_non_memoized_property |
| 3391 | def _from_objects(self) -> List[FromClause]: |
no test coverage detected