小编Eri*_*ert的帖子

我想知道是否有人可以帮助解释为什么GROUP BY在常数列上使用VARCHARvs. INTEGER给出不同行为的列。

这是我的最小工作示例。下表模拟了我发现此问题的真实数据：

CREATE TABLE test.show_bug AS

WITH integers AS (
    SELECT 0 AS num
    UNION SELECT 1 AS num
    UNION SELECT 2 AS num
    UNION SELECT 3 AS num
    UNION SELECT 4 AS num
    UNION SELECT 5 AS num
)
SELECT 
    '2017-03-16' + mod(a.num, 2) AS date_time 
    , CASE mod(b.num, 3)
        WHEN 0 THEN 'source_a'
        WHEN 1 THEN 'source_b'
        WHEN 2 THEN 'source_c'
        END AS user_source
    , b.num || a.num || b.num || …