如何按包含 Presto 列表的列过滤数据框？

Question

有查询：

    SELECT 
      value,
      type
    FROM dt

我得到：

value   type
12     [increase, upload]
12     [increase, download]
12     [decrease, delete]

我想获取列类型为 'upload' 的值。然而这个：

    SELECT 
      value,
      type
    FROM dt 
    WHERE type LIKE 'upload'

不起作用。怎么做？

Answer 1

假设 type 是一个 ARRAY 的 varchars 你可以简单地使用 contains:

WITH dataset (value, type) AS (
    VALUES (12, array [ 'increase', 'upload' ]),
        (12, array [ 'increase', 'download' ]),
        (12, array [ 'decrease', 'delete' ])
)

SELECT value,
      type
FROM dataset
WHERE contains(type, 'upload')

输出：

value	type
12	[increase, upload]

如何按包含 Presto 列表的列过滤数据框？

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