Re: [sqlsmith] Failed assertion in joinrels.c

Tom Lane writes:

> Well, I certainly think all of these represent bugs:
>
> [...]

thanks for priorizing them. I'll try to digest them somewhat before
posting.

> This one's pretty darn odd, because 2619 is pg_statistic and not an index
> at all:
>
>> 4 | ERROR: cache lookup failed for index 2619

This is actually the one from the README :-). Quoting to spare media
discontinuity:

--8<---------------cut here---------------start------------->8---
Taking a closer look at it reveals that it happens when you query a
certain catalog view like this:

self=# select indexdef from pg_catalog.pg_indexes where indexdef is not NULL;
FEHLER: cache lookup failed for index 2619

This is because the planner then puts pg_get_indexdef(oid) in a context
where it sees non-index-oids, which causes it to croak:

QUERY PLAN
------------------------------------------------------------------------------------
Hash Join (cost=17.60..30.65 rows=9 width=4)
Hash Cond: (i.oid = x.indexrelid)
-> Seq Scan on pg_class i (cost=0.00..12.52 rows=114 width=8)
Filter: ((pg_get_indexdef(oid) IS NOT NULL) AND (relkind = 'i'::"char"))
-> Hash (cost=17.31..17.31 rows=23 width=4)
-> Hash Join (cost=12.52..17.31 rows=23 width=4)
Hash Cond: (x.indrelid = c.oid)
-> Seq Scan on pg_index x (cost=0.00..4.13 rows=113 width=8)
-> Hash (cost=11.76..11.76 rows=61 width=8)
-> Seq Scan on pg_class c (cost=0.00..11.76 rows=61 width=8)
Filter: (relkind = ANY ('{r,m}'::"char"[]))
--8<---------------cut here---------------end--------------->8---

thanks,
Andreas