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* BUG #17723: cache lookup failed for type 0
@ 2022-12-16 15:38 PG Bug reporting form <noreply@postgresql.org>
0 siblings, 1 reply; 3+ messages in thread
From: PG Bug reporting form @ 2022-12-16 15:38 UTC (permalink / raw)
To: pgsql-bugs@lists.postgresql.org; +Cc: vik@postgresfriends.org
The following bug has been logged on the website:
Bug reference: 17723
Logged by: Vik Fearing
Email address: vik@postgresfriends.org
PostgreSQL version: Unsupported/Unknown
Operating system: Ubuntu
Description:
This query:
WITH RECURSIVE
run(x, y) AS (
SELECT 0, 0
UNION ALL
SELECT x, y FROM run AS r WHERE r.is_cycle
)
CYCLE x, y SET is_cycle USING path
TABLE run
;
in which I mistakenly tried to access the is_cycle column from inside the
wle, provokes the following error:
ERROR: XX000: cache lookup failed for type 0
LOCATION: typeOrDomainTypeRelid, parse_type.c:699
Even though I did not need to add that WHERE clause because the CYCLE clause
does it for me, I still should have been able to. And in any case, I should
not have received an XX000 error.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: BUG #17723: cache lookup failed for type 0
@ 2022-12-16 17:10 Tom Lane <tgl@sss.pgh.pa.us>
parent: PG Bug reporting form <noreply@postgresql.org>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2022-12-16 17:10 UTC (permalink / raw)
To: vik@postgresfriends.org; +Cc: pgsql-bugs@lists.postgresql.org, Peter Eisentraut <peter.eisentraut@enterprisedb.com>
PG Bug reporting form <noreply@postgresql.org> writes:
> This query:
> WITH RECURSIVE
> run(x, y) AS (
> SELECT 0, 0
> UNION ALL
> SELECT x, y FROM run AS r WHERE r.is_cycle
> )
> CYCLE x, y SET is_cycle USING path
> TABLE run
> ;
> in which I mistakenly tried to access the is_cycle column from inside the
> wle, provokes the following error:
> ERROR: XX000: cache lookup failed for type 0
> LOCATION: typeOrDomainTypeRelid, parse_type.c:699
Yeah. We are calling addRangeTableEntryForCTE inside parse analysis of
the CTE's query, and it's generating a ParseNamespaceItem with p_vartype = 0
because analyzeCTE hasn't yet identified the cycle_mark_type. That
eventually results in a Var with vartype 0, confusing later parse analysis.
It looks to me like we can just move that part of the code up to before
we recurse to parse_sub_analyze, though. AFAICS, identification of the
cycle column type needn't (and had better not) depend on any
characteristics of the CTE's query.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: BUG #17723: cache lookup failed for type 0
@ 2022-12-16 19:36 Vik Fearing <vik@postgresfriends.org>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: Vik Fearing @ 2022-12-16 19:36 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-bugs@lists.postgresql.org, Peter Eisentraut <peter.eisentraut@enterprisedb.com>
On 12/16/22 18:10, Tom Lane wrote:
> PG Bug reporting form <noreply@postgresql.org> writes:
>> This query:
>
>> WITH RECURSIVE
>
>> run(x, y) AS (
>> SELECT 0, 0
>> UNION ALL
>> SELECT x, y FROM run AS r WHERE r.is_cycle
>> )
>> CYCLE x, y SET is_cycle USING path
>
>> TABLE run
>> ;
>
>> in which I mistakenly tried to access the is_cycle column from inside the
>> wle, provokes the following error:
>
>> ERROR: XX000: cache lookup failed for type 0
>> LOCATION: typeOrDomainTypeRelid, parse_type.c:699
>
> Yeah. We are calling addRangeTableEntryForCTE inside parse analysis of
> the CTE's query, and it's generating a ParseNamespaceItem with p_vartype = 0
> because analyzeCTE hasn't yet identified the cycle_mark_type. That
> eventually results in a Var with vartype 0, confusing later parse analysis.
>
> It looks to me like we can just move that part of the code up to before
> we recurse to parse_sub_analyze, though. AFAICS, identification of the
> cycle column type needn't (and had better not) depend on any
> characteristics of the CTE's query.
Indeed, it should only depend on the TO and DEFAULT subclauses (not
shown here).
Thanks for the fix!
--
Vik Fearing
^ permalink raw reply [nested|flat] 3+ messages in thread
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2022-12-16 15:38 BUG #17723: cache lookup failed for type 0 PG Bug reporting form <noreply@postgresql.org>
2022-12-16 17:10 ` Tom Lane <tgl@sss.pgh.pa.us>
2022-12-16 19:36 ` Vik Fearing <vik@postgresfriends.org>
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