Teiid SQL 异常 - Groupby 子句中不存在字段

Question

我有一个使用 date_time 列生成小时聚合的查询。 date_time 列以别名出现在分组依据中，但我收到以下错误：

': org.teiid.jdbc.TeiidSQLException: TEIID30492 Remote org.teiid.api.exception.query.QueryValidatorException: TEIID30492 [DB.foo.date_time] cannot be used outside of aggregate functions since they are not present in a GROUP BY clause

我似乎无法弄清楚为什么会这样，因为我不尝试拉 date_time 列本身，只是 Hour(date_time) 我别名为 "hr"

这里是查询：

SELECT DISTINCT COUNT(*) as visits, hr
FROM
(SELECT DISTINCT 
        HOUR(date_time) AS hr, COUNT(DISTINCT(CONCAT(post_visid_high,CONCAT(post_visid_low,CONCAT(visit_num, visit_start_time_gmt))))) AS visits,  
        CASE 
            WHEN date_time BETWEEN '2017-12-07 00:00:00' AND '2017-12-07 23:59:59.999999' THEN 'yesterday' 
            WHEN date_time BETWEEN '2017-12-06 00:00:00' AND '2017-12-07 23:59:59.999999'  THEN 'day_before' 
        END AS date_range 
  FROM 
    DB.foo
  WHERE 
    date_time BETWEEN '2017-12-07 00:00:00' AND '2017-12-07 23:59:59.999999' 
    OR date_time BETWEEN '2017-12-06 00:00:00' AND '2017-12-07 23:59:59.999999' 
    AND report_suite IN ('X', 'Y', 'Z')
    AND exclude_hit = 0
    AND hit_source NOT IN (5,7,8,9)
      AND post_pagename IN 
      (SELECT DISTINCT post_pagename 
      FROM DB.foo 
      WHERE post_pagename IS NOT NULL 
        AND post_pagename != (' '))) b
GROUP BY hr

为什么它认为存在 date_time 而不是 "hr"

Answer 1

这最终归因于 Teiid 评估查询的方式。 GROUP BY 子句中无法识别别名：

来自 Teiid 文档：不能对 SELECT 子句中的别名进行分组依据中的列引用。

https://docs.jboss.org/author/display/teiid813final/GROUP+BY+Clause

Teiid SQL 异常 - Groupby 子句中不存在字段

Teiid SQL Exception - Field not Present in Groupby Clause

sql

teiid