Subject: v12: ERROR: subplan "InitPlan 2 (returns $4)" was not initialized

From: Justin Pryzby <[email-masked]>
Date: Tue, 11 Apr 2023 09:25:44 -0500

Reduced from sqlsmith, this query fails under debug_parallel_query=1.

The elog was added at: 55416b26a98fcf354af88cdd27fc2e045453b68a
But (I'm not sure) the faulty commit may be 8edd0e7946 (Suppress Append
and MergeAppend plan nodes that have a single child).

postgres=# SET force_parallel_mode =1; CREATE TABLE x (i int) PARTITION BY RANGE (i); CREATE TABLE x1 PARTITION OF x DEFAULT ;
 select * from pg_class,
  lateral (select pg_catalog.bit_and(1)
      from pg_class as sample_1
      where case when EXISTS (
            select 1 from x
              where EXISTS (
                select 1 from pg_catalog.pg_depend
                  where (sample_1.reltuples is NULL)
                  )) then 1 end
           is NULL)x
where false;

-- 
Justin