[jira] [Assigned] (KYLIN-2427) Auto adjust join order to make query executable

[" Kaige Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-2427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

 Kaige Liu reassigned KYLIN-2427:
---------------------------------

    Assignee:  Kaige Liu

> Auto adjust join order to make query executable
> -----------------------------------------------
>
>                 Key: KYLIN-2427
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2427
>             Project: Kylin
>          Issue Type: Bug
>            Reporter:  Kaige Liu
>            Assignee:  Kaige Liu
>
> KYLIN-2406 reports an issue: The order of joins will affect the result of query. For example, below query leads to "No model found"
> Below query triggers NPE
> {code}
> with tmp3 as (
>     select l_partkey, 0.5 * sum(l_quantity) as sum_quantity, l_suppkey
>     from v_lineitem
>     inner join supplier on l_suppkey = s_suppkey
>     inner join nation on s_nationkey = n_nationkey
>     inner join part on l_partkey = p_partkey
>     where l_shipdate >= '1992-01-01' and l_shipdate <= '1995-01-01'
>     and n_name = 'CANADA'
>     and p_name like 'forest%'
>     group by l_partkey, l_suppkey
> )
> select
>     s_name,
>     s_address
> from
>     v_partsupp
>     inner join tmp3 on ps_partkey = l_partkey and ps_suppkey = l_suppkey
>     inner join supplier on ps_suppkey = s_suppkey
> where
>     ps_availqty > sum_quantity
> group by
>     s_name, s_address
> order by
>     s_name
> {code}
> While below query is OK. Only difference being the order of "inner join tmp3" and "inner join supplier"
> {code}
> with tmp3 as (
>     select l_partkey, 0.5 * sum(l_quantity) as sum_quantity, l_suppkey
>     from v_lineitem
>     inner join supplier on l_suppkey = s_suppkey
>     inner join nation on s_nationkey = n_nationkey
>     inner join part on l_partkey = p_partkey
>     where l_shipdate >= '1992-01-01' and l_shipdate <= '1995-01-01'
>     and n_name = 'CANADA'
>     and p_name like 'forest%'
>     group by l_partkey, l_suppkey
> )
> select
>     s_name,
>     s_address
> from
>     v_partsupp
>     inner join supplier on ps_suppkey = s_suppkey
>     inner join tmp3 on ps_partkey = l_partkey and ps_suppkey = l_suppkey
> where
>     ps_availqty > sum_quantity
> group by
>     s_name, s_address
> order by
>     s_name
> {code}



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