Re: jsonb crash

Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec> writes:
> I found a crash (segmentation fault) on jsonb.
> This is the best I could do to reduce the query:

> """
> select
> 75 as c1
> from
> public.pagg_tab_ml as ref_0,
> lateral (select
> ref_0.a as c5
> from generate_series(1, 300) as sample_0
> fetch first 78 rows only
> ) as subq_0
> where case when (subq_0.c5 < 2)
> then cast(null as jsonb)
> else cast(null as jsonb)
> end ? ref_0.c
> """

I think this must be a memoize bug. AFAICS, nowhere in this query
can we be processing a non-null JSONB value, so what are we doing
in jsonb_hash? Something down-stack must have lost the information
that the Datum is actually null.

regards, tom lane