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/* syntax version 1 */
$st_many = <|a: "one", b: "two", c: "three", d: "four"|>;
$st_single = <|a: "zero"|>;
$st_empty = <||>;
$tup = AsTuple("first", "second");
$concat = ($item, $state) -> { return $state || $item; };
$start = ($value) -> { return "(" || $value || ")"; };
SELECT
StaticFold($st_many, "->", $concat),
StaticFold($st_single, "->", $concat),
CAST(StaticFold($st_empty, "->", $concat) AS Optional<String>),
StaticFold($tup, "->", $concat);
SELECT
StaticFold1($st_many, $start, $concat),
StaticFold1($st_single, $start, $concat),
CAST(StaticFold1($st_empty, $start, $concat) AS Optional<String>),
StaticFold1($tup, $start, $concat);
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