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@@ -23,6 +23,7 @@ if TYPE_CHECKING:
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from .selectable import Subquery
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_T = TypeVar("_T", bound=Any)
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_T_co = TypeVar("_T_co", bound=Any, covariant=True)
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class SQLRole:
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@@ -110,7 +111,7 @@ class ColumnsClauseRole(AllowsLambdaRole, UsesInspection, ColumnListRole):
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raise NotImplementedError()
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class TypedColumnsClauseRole(Generic[_T], SQLRole):
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class TypedColumnsClauseRole(Generic[_T_co], SQLRole):
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"""element-typed form of ColumnsClauseRole"""
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__slots__ = ()
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@@ -162,7 +163,7 @@ class WhereHavingRole(OnClauseRole):
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_role_name = "SQL expression for WHERE/HAVING role"
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class ExpressionElementRole(TypedColumnsClauseRole[_T]):
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class ExpressionElementRole(TypedColumnsClauseRole[_T_co]):
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# note when using generics for ExpressionElementRole,
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# the generic type needs to be in
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# sqlalchemy.sql.coercions._impl_lookup mapping also.
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