Re: Minor buglet in update...from (I think) - Mailing list pgsql-hackers

From Bruce Momjian
Subject Re: Minor buglet in update...from (I think)
Date
Msg-id 200111262022.fAQKMtj16709@candle.pha.pa.us
Whole thread Raw
In response to Minor buglet in update...from (I think)  (Philip Warner <pjw@rhyme.com.au>)
Responses Re: Minor buglet in update...from (I think)
List pgsql-hackers
Can anyone explain this failure?  It still exists in CVS.

---------------------------------------------------------------------------

> 
> A minor nasty error I got when trying to improve the query used to disable
> triggers:
> 
> create table t1(f1 int4, f2 int4);
> create table t2(f1 int4, f2 int4);
> 
> insert into t1 values(1, 0);
> insert into t1 values(2, 0);
> 
> insert into t2 values(1, 0);
> 
> update t1 set f2=count(*) from t2 where t1.f1=1 and t2.f1=t1.f1 ;
> UPDATE 1
> 
> update t1 set f2=count(*) from t2 where t1.f1=2 and t2.f1=t1.f1 ;
> ERROR:  ExecutePlan: (junk) `ctid' is NULL!
> 
> I would have expected no update to occur since no rows match.
> 
> 
> ----------------------------------------------------------------
> Philip Warner                    |     __---_____
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> Http://www.rhyme.com.au          |                /           \|
>                                  |    --________--
> PGP key available upon request,  |  /
> and from pgp5.ai.mit.edu:11371   |/
> 

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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