>>>>> "Andrew" == Andrew Gierth <and...@tao11.riddles.org.uk> writes:

 Andrew> Going to see if this can be narrowed down further.

Simpler testcase, removing the CTE, so this is clearly just about
InitPlan:

create table mytable (flag boolean default false, foo integer);
insert into mytable default values;

session B:
  begin; update mytable set flag = true;

session A:
  update mytable set foo = case when not flag then foo else length((select 
'foo')) end;

commit in B and watch A die in:
#1  0x0000000000b001bd in text_length (str=0) at varlena.c:647

-- 
Andrew (irc:RhodiumToad)

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