Horton

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

Justin Pryzby <pryzby@telsasoft.com>

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From: Justin Pryzby <pryzby@telsasoft.com>
To: pgsql-hackers@postgresql.org
Cc: David Rowley <dgrowleyml@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-04-11T14:25:44Z
Lists: pgsql-hackers 
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

Commits

  1. Fix parallel-safety marking when moving initplans to another node.

  2. Guard against core dump from uninitialized subplan.

  3. Mark a query's topmost Paths parallel-unsafe if they will have initPlans.