java - 将较大的 SQL 转换为通过 UNION ALL 组合的多个较小的 SQL

Question

我有一个类似 SQL 的示例

SELECT id, age, department
FROM User
WHERE
age < 50 AND id > 100 AND
(
  department = 'IT' OR department = 'DEVOPS' OR department = 'ACCOUNTING' .... more OR conditions on department
) 

我需要将这个SQL转换为多个SQL，并通过UNION ALL组合起来(其中保留原来的逻辑)。

期望的结果是

(
  SELECT id, age, department
  FROM User
  WHERE age < 50 AND id > 100 AND department = 'IT'
)
UNION ALL
(
  SELECT id, age, department
  FROM User
  WHERE age < 50 AND id > 100 AND department = 'DEVOPS'
)
UNION ALL
(
  SELECT id, age, department
  FROM User
  WHERE age < 50 AND id > 100 AND department = 'ACCOUNTING'
)
UNION ALL
....further conditions

位背景

我们使用 PRESTO DB 作为 SQL 引擎。 我们发现 1 个限制，其中如果查询很大且具有超过 1000 个 AND/OR 条件，则查询会失败。 解决方案之一是通过 UNION 减少条件。 https://support.treasuredata.com/hc/en-us/articles/360001457447-Presto-Query-FAQs

这可以通过使用 SQL 解析器库以编程方式实现吗？

Answer 1

使用in和not Between

select *
from myTable
where department in ('IT', 'Finance', 'etc')
and not age between 50 and 100