$variantWithOptionalMemberType = Variant<a: Optional<Int32>, b: String>;

$optionalVariantWithOptionalMemberData = [
    <|variantValue: Just(Variant(Just(10),        "a", $variantWithOptionalMemberType))|>,
    <|variantValue: Just(Variant(Nothing(Int32?), "a", $variantWithOptionalMemberType))|>,
    <|variantValue: Nothing(OptionalType($variantWithOptionalMemberType))|>,
    <|variantValue: Just(Variant("world",         "b", $variantWithOptionalMemberType))|>,
];

SELECT variantValue.a AS aAlternative, variantValue.b AS bAlternative FROM as_table($optionalVariantWithOptionalMemberData);