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From "Shaofeng SHI (JIRA)" <>
Subject [jira] [Commented] (KYLIN-3476) Fix TupleExpression verification when parsing sql
Date Mon, 06 Aug 2018 10:00:00 GMT


Shaofeng SHI commented on KYLIN-3476:



Yanghong, a user reported this error; It seems a measure value couldn't be used in "division",
but that should be accepted as it is not in a "sum" or other calculation. Is it a bug?

> Fix TupleExpression verification when parsing sql
> -------------------------------------------------
>                 Key: KYLIN-3476
>                 URL:
>             Project: Kylin
>          Issue Type: Bug
>    Affects Versions: v2.4.0
>            Reporter: Zhong Yanghong
>            Assignee: Zhong Yanghong
>            Priority: Major
>             Fix For: v2.5.0
>         Attachments: APACHE-KYLIN-3476.patch, image-2018-08-06-17-58-18-760.png
> Previously there's a validation check for sql, since dynamic column does not support
{{sum(col1/col2)}}. However, if the sql has a subquery and {{sum(col1/col2)}} is in the main
query rather than the sub-query, this should be OK. One example is as follows:
> {code}
> select T1.D1, sum(T1.gmv/T2.gmv)
> from 
> (select D1, D2, sum(M1) as gmv
> from T
> group by D1, D2) T1
> inner join
> (select D1, D2, sum(M2) as gmv
> from T
> group by D1, D2) T2
> on T1.D1 = T2.D1
> group by T1.D1
> {code}
> Since the outside {{sum(T1.gmv/T2.gmv)}} is handled by calcite rather than Kylin, it's
OK and should not go through the verification.

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