RedShift Error when using COUNT (Distinct XXX) ERROR: XX000: This type of associated subquery patter

Posted 2023-03-31

【中文标题】RedShift Error when using COUNT (Distinct XXX) ERROR: XX000: This type of associated subquery patterns is not supported due to internal error

【英文标题】：RedShift Error when using COUNT (Distinct XXX) ERROR: XX000: This type of correlated subquery pattern is not supported due to internal error

【发布时间】：2019-09-26 12:07:31

【问题描述】：

我有一个通过 Aginity 在 RedShift 中运行的小查询，但出现以下错误：

错误：XX000：由于内部错误，不支持这种类型的关联子查询模式

当前查询：

SELECT 'MYSCHEMA.MYTABLE.FIELDA' as obj_name,
COUNT(*) as rows, 
COUNT(DISTINCT FIELDA) as distinct_vals, 
SUM(CASE WHEN FIELDA in ('00DK','00DC','00DE','00DD','00DB') THEN 1 ELSE 0 END) as enter, 
SUM(CASE WHEN TRIM(FIELDA) IN ('',null) THEN 1 ELSE 0 END) as nulls 
FROM MYSCHEMA.MYTABLE

但是，如果我删除它运行的 DISTINCT：

SELECT 'MYSCHEMA.MYTABLE.FIELDA' as obj_name,
COUNT(*) as rows, 
COUNT(FIELDA) as distinct_vals, 
SUM(CASE WHEN FIELDA in ('00DK','00DC','00DE','00DD','00DB') THEN 1 ELSE 0 END) as enter, 
SUM(CASE WHEN TRIM(FIELDA) IN ('',null) THEN 1 ELSE 0 END) as nulls 
FROM MYSCHEMA.MYTABLE

【问题讨论】：

为 PostgreSQL 标签道歉，我认为它是相关的，因为 Redshift 基于 PostgreSQl ~8.3？

MYSCHEMA.MYTABLE 是一个视图吗？

@JonScott 是

您需要共享视图的 sql（即更新您的问题），因为这是根本原因 - 实际上您正在将该 sql（在视图中）作为子查询运行。您已经破坏了此处记录的其中一种情况docs.aws.amazon.com/redshift/latest/dg/…。但是，看起来下面的答案无论如何都解决了您的问题。

我已经从答案中得到了它，但我会看看那个文档，谢谢

【参考方案1】：

如果您在子查询中使用窗口函数，它是否有效？

SELECT 'MYSCHEMA.MYTABLE.FIELDA' as obj_name,
       COUNT(*) as rows, 
       SUM( (seqnum = 1)::INT ) as distinct_vals, 
       SUM(CASE WHEN FIELDA in ('00DK','00DC','00DE','00DD','00DB') THEN 1 ELSE 0 END) as enter, 
       SUM(CASE WHEN TRIM(FIELDA) IN ('',null) THEN 1 ELSE 0 END) as nulls 
FROM (SELECT t.*,
             ROW_NUMBER() OVER (PARTITION BY FIELDA ORDER BY FIELDA) as seqnum
      FROM MYSCHEMA.MYTABLE t
     ) t