Fennel calc cannot cast VARBINARY values. For example,

  VALUES (CAST(x'ABCDEF12' AS VARBINARY(2)))

should return the VARBINARY string 'ABCD', but gives

  Optimizer failed to find a valid physical implementation for relational expression rel#104:CalcRel.NONE(child=HepRelVertex#107,expr#0={inputs},expr#1=X'ABCDEF12',expr#2=CAST($t1):VARBINARY(2) NOT NULL,EXPR$0=$t2); see trace for partially optimized plan. Details: reason is [Node's traits (NONE) do not match required traits (ITERATOR)]; while preparing statement [values (CAST(x'ABCDEF12' AS VARBINARY(2)))].

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