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/* syntax version 1 */
$merge = ($_name, $l, $r) -> { return Coalesce($l, 0) + Coalesce($r, 0); };
$left = <|a: 1, b: 2, c: 3|>;
$right = <|c: 1, d: 2, e: 3|>;
SELECT
StructUnion($left, $right),
StructUnion($left, $right, $merge),
StructIntersection($left, $right),
StructIntersection($left, $right, $merge),
StructDifference($left, $right),
StructSymmetricDifference($left, $right)
;
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