Creates a new value of a specified type and adds it as a new attribute (column)
to each tuple (row) of the relation (table).
The new value is defined by an arbitrary expression, which must be of the specified type. All existing attributes of the tuple are available to use as variables in an expression, provided the attribute name is a Jexl simple identifier. See the Jexl documentation for details.
Note that this operation goes beyond first order Relational Algebra by allowing new values to be created.
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