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Interpret 'table' signature items more flexibly, automatically adding (Ur) constraints to support a kind of subtyping over (SQL) constraint sets
author Adam Chlipala <adam@chlipala.net>
date Mon, 04 Nov 2013 15:14:23 -0500
parents 5c1f10cdac63
children
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table t : { A : int, B : string, C : float }
table u : { D : int, E : string, F : float }

val q : transaction (list {T : { A : int, B : string, C : float}, U : { D : int }, X : string }) =
    queryL (SELECT t.*, u.D, 'hi' AS X
            FROM t, u)