Class ConstraintEntity (1.12.4) 

ConstraintEntity(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Constraint is not used as an independent entity, it is retrieved as part of another entity such as Table or View.

Attributes
Name Description
name str
The name of the table constraint.
type_ str
Type of constraint, for example unique, primary key, foreign key (currently only primary key is supported).
table_columns MutableSequence[str]
Table columns used as part of the Constraint, for example primary key constraint should list the columns which constitutes the key.
custom_features google.protobuf.struct_pb2.Struct
Custom engine specific features.
reference_columns MutableSequence[str]
Reference columns which may be associated with the constraint. For example, if the constraint is a FOREIGN_KEY, this represents the list of full names of referenced columns by the foreign key.
reference_table str
Reference table which may be associated with the constraint. For example, if the constraint is a FOREIGN_KEY, this represents the list of full name of the referenced table by the foreign key.
table_name str
Table which is associated with the constraint. In case the constraint is defined on a table, this field is left empty as this information is stored in parent_name. However, if constraint is defined on a view, this field stores the table name on which the view is defined.