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# Lambda表达式
Lambda表达式使用`->`表示：
x -> x + 1
(x, y) -> x + y
x -> regexp_like(x, 'a+')
x -> x[1] / x[2]
x -> IF(x > 0, x, -x)
x -> COALESCE(x, 0)
x -> CAST(x AS JSON)
x -> x + TRY(1 / 0)
大多数SQL表达式都可以用在lambda体中，但有一些例外：
- 不支持子查询：`x -> 2 + (SELECT 3)`
- 不支持聚合：`x -> max(y)`