如何在 BigQuery 中声明列表/数组/结构类型变量

Question

如何在 BigQuery 中声明一个列表类型变量，以便在 where 子句中使用它？我有这个代码

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN (1, 2)

相反，我想用查询中的变量来说明问题

DECLARE list ARRAY;
SET list = (1,2);

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN list

我尝试过 DECLARE list STRUCT [小于] int64,int64 [大于] 它不接受

Answer 1

如果您确实想将 DECLARE 与 STRUCT 类型一起使用，或者对于找到此帖子的其他人，以下语法似乎也有效：

DECLARE foo DEFAULT (SELECT AS STRUCT 2, 2, 2, 2);

Answer 2

试试下面的代码：

DECLARE list ARRAY <INT64>;
SET list = [1,2];

WITH
  subquery AS (
  SELECT
    1 AS col1
  UNION ALL
  SELECT
    2 AS col1
  UNION ALL
  SELECT
    3 AS col1 )

SELECT
  col1
FROM
  subquery
WHERE
  col1 IN UNNEST(list)