Re: BUG #18187: Unexpected error: "variable not found in subplan target lists" triggered by JOIN
| От | Richard Guo |
|---|---|
| Тема | Re: BUG #18187: Unexpected error: "variable not found in subplan target lists" triggered by JOIN |
| Дата | |
| Msg-id | CAMbWs4_yrqMYXd+zXc4Y6KjnyA8xPZE6aiAW6k2Y10WaNhwRhw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: BUG #18187: Unexpected error: "variable not found in subplan target lists" triggered by JOIN (Andrei Lepikhov <a.lepikhov@postgrespro.ru>) |
| Ответы |
Re: BUG #18187: Unexpected error: "variable not found in subplan target lists" triggered by JOIN
Re: BUG #18187: Unexpected error: "variable not found in subplan target lists" triggered by JOIN |
| Список | pgsql-bugs |
On Wed, Nov 8, 2023 at 11:42 PM Andrei Lepikhov <a.lepikhov@postgrespro.ru> wrote:
The issue looks like previous one, related to new SJE feature.
Reduced case:
CREATE TABLE t2 (vkey int4, c9 text, primary key(vkey));
SELECT * FROM (
SELECT CASE WHEN '1' = ref_0.c9 THEN 1 ELSE 1 END AS c_3
FROM t2 as ref_0
JOIN t2 AS ref_1
ON ref_0.vkey = ref_1.vkey
RIGHT OUTER JOIN t2 AS ref_2
ON ref_1.vkey = ref_2.vkey) AS t5
RIGHT OUTER JOIN (SELECT 1 AS c_2) AS t4
ON t4.c_2 IS NOT NULL;
The key problem lies in the 'CASE' statement.
I've looked into this a little bit. I think it's caused by the SJE
logic not properly removing references from PHVs. Specifically, it
fails to replace the ref_0's Vars within phv->phexpr, leading them to be
added in ref_2/ref_1 join's targetlist.
Also, I noticed that in remove_rel_from_query() we perform replace_relid
for phv->phrels twice at line 475 and 478, which seems not right to me.
475 phv->phrels = replace_relid(phv->phrels, relid, subst);
476 phv->phrels = replace_relid(phv->phrels, ojrelid, subst);
477 phinfo->ph_lateral = replace_relid(phinfo->ph_lateral, relid, subst);
478 phinfo->ph_var->phrels = replace_relid(phinfo->ph_var->phrels, relid, subst);
Attached is a hotfix.
Thanks
Richard
logic not properly removing references from PHVs. Specifically, it
fails to replace the ref_0's Vars within phv->phexpr, leading them to be
added in ref_2/ref_1 join's targetlist.
Also, I noticed that in remove_rel_from_query() we perform replace_relid
for phv->phrels twice at line 475 and 478, which seems not right to me.
475 phv->phrels = replace_relid(phv->phrels, relid, subst);
476 phv->phrels = replace_relid(phv->phrels, ojrelid, subst);
477 phinfo->ph_lateral = replace_relid(phinfo->ph_lateral, relid, subst);
478 phinfo->ph_var->phrels = replace_relid(phinfo->ph_var->phrels, relid, subst);
Attached is a hotfix.
Thanks
Richard
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