Question

我在hive查询中使用四级嵌套时遇到问题。下面是我正在执行的查询 -

SELECT *, 
SUM(qtod.amount) OVER (PARTITION BY qtod.id, qtod.year_begin_date ORDER BY qtod.tran_date)
FROM (SELECT *, 
    SUM(mtod.amount) OVER (PARTITION BY mtod.id, mtod.quarter_begin_date ORDER BY mtod.tran_date)
    FROM (SELECT *, 
        SUM(wtod.amount) OVER (PARTITION BY wtod.id, wtod.month_begin_date ORDER BY wtod.tran_date)
        FROM (select id,
            year_begin_date,
            quarter_begin_date,
            month_begin_date,
            week_begin_date,
            tran_date,
            amount,
            SUM(amount) 
OVER (PARTITION BY id,week_begin_date ORDER BY tran_date) FROM table_name)wtod)mtod)qtod;

如果我排除了第四级嵌套，它工作正常，但在包含它时，低于错误消息 -

FAILED：SemanticException [错误10007]：不明确的列引用 qtod中的_c1

为避免嵌套，我试图以其他方式进行嵌套

SELECT * FROM
    (SELECT id,year_begin_date,tran_date,amount,SUM(amount) OVER (PARTITION BY id,year_begin_date ORDER BY tran_date) FROM yeartodate)ytod
    JOIN 
(SELECT *, SUM(mtod.amount) OVER (PARTITION BY mtod.id, mtod.quarter_begin_date ORDER BY mtod.tran_date)
FROM (SELECT *, SUM(wtod.amount) OVER (PARTITION BY wtod.id, wtod.month_begin_date ORDER BY wtod.tran_date)
FROM (select id,
    year_begin_date,
    quarter_begin_date,
    month_begin_date,
    week_begin_date,
    tran_date,
    amount,
    SUM(amount) 
OVER (PARTITION BY id,week_begin_date ORDER BY tran_date) FROM table_name)wtod)mtod)qtod
ON qtod.id=ytod.id AND qtod.tran_date=ytod.tran_date;

错误仍然相同。
在网上搜索后，根据JIRA为蜂巢提出的问题，发现蜂巢本身就是一个问题

由于 jira已修复，而且补丁在hive 14 中可用，因此我尝试在hive 14（HDP）上运行它。
仍然得到相同的错误请写下你的建议......

Answer 1

SELECT内的非别名函数调用映射到列名_c1，_c2等。在这种情况下，每个{{1}都有一个非别名函数调用所以他们都创建了一个列SELECT。

问题在于，因为您正在从下一个子查询中执行_c1，然后追加映射到SELECT *的另一个函数调用，那么您将拥有两次相同的列，因此围绕模糊列引用的错误。

解决方案应该是对所有函数调用进行别名，以便它们不使用_c1默认名称，如下所示：

_c1

SemanticException [错误10007]：不明确的列引用_c1

1 个答案: