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

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

 Kaige Liu created KYLIN-2427:
---------------------------------

             Summary: 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


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}

But below query is OK.
{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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