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/* postgres can not */
/* syntax version 1 */
$data = <|x: [<|y: 2|>], z: 5|>;
-- set field function
$F = ($field, $function) -> (
($struct) -> (
ReplaceMember($struct, $field, $function($struct.$field))
)
);
-- set list element function
$E = ($index, $function) -> (
($list) -> (
ListMap(ListEnumerate($list), ($pair) -> (
IF ($pair.0 = $index, $function($pair.1), $pair.1)
))
)
);
-- set value function
$V = ($value) -> (
($_item) -> ($value)
);
SELECT $F("x", $E(0, $F("y", $V(3))))($data)
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