sql like: 
select k5, k6, SUM(k3) AS k3 
from ( 
    select
        k5,
        date_format(k6, '%Y-%m-%d') as k6,
        count(distinct k3) as k3 
    from t 
    group by k5, k6
) AS temp where 1=1
group by k5, k6;

will throw exception since conjuncts planned on exchange node, because exchange node cannot handle conjuncts, now we skip exchange node when planning conjuncts, which fixes the bug. 
notice: the bug occurs iff the conjunct is always true like 1=1 above.

sql like: 
select k5, k6, SUM(k3) AS k3 
from ( 
    select
        k5,
        date_format(k6, '%Y-%m-%d') as k6,
        count(distinct k3) as k3 
    from t 
    group by k5, k6
) AS temp where 1=1
group by k5, k6;

will throw exception since conjuncts planned on exchange node, because exchange node cannot handle conjuncts, now we skip exchange node when planning conjuncts, which fixes the bug. 
notice: the bug occurs iff the conjunct is always true like 1=1 above.

sql like: 
select k5, k6, SUM(k3) AS k3 
from ( 
    select
        k5,
        date_format(k6, '%Y-%m-%d') as k6,
        count(distinct k3) as k3 
    from t 
    group by k5, k6
) AS temp where 1=1
group by k5, k6;

will throw exception since conjuncts planned on exchange node, because exchange node cannot handle conjuncts, now we skip exchange node when planning conjuncts, which fixes the bug. 
notice: the bug occurs iff the conjunct is always true like 1=1 above.

commit f5d6201
Author: morrySnow <101034200+morrySnow@users.noreply.github.com>
Date:   Wed Mar 22 10:53:15 2023 +0800

    [fix](planner) should always execute projection plan (apache#17885)

    1. should always execute projection plan, whatever the statement it is.
    2. should always execute projection plan, since we only have vectorized engine now

commit ad61c84
Author: mch_ucchi <41606806+sohardforaname@users.noreply.github.com>
Date:   Mon Mar 27 17:50:52 2023 +0800

    [fix](planner) fix conjunct planned on exchange node (apache#18042)

    sql like:
    select k5, k6, SUM(k3) AS k3
    from (
        select
            k5,
            date_format(k6, '%Y-%m-%d') as k6,
            count(distinct k3) as k3
        from t
        group by k5, k6
    ) AS temp where 1=1
    group by k5, k6;

    will throw exception since conjuncts planned on exchange node, because exchange node cannot handle conjuncts, now we skip exchange node when planning conjuncts, which fixes the bug.
    notice: the bug occurs iff the conjunct is always true like 1=1 above.