General Bug Report: backend closes with aggregate functions on views

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name        : Richi Plana
Your email address    :  richip@mozcom.com

Category        : runtime: back-end: SQL
Severity        : serious

Summary: backend closes with aggregate functions on views

System Configuration
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  Operating System   : SMP Intel/Linux 2.2.0, Sparc/Solaris 2.6

  PostgreSQL version : 6.4.2

  Compiler used      : pgcc-1.1.1 and egcs-1 (for Sparc)

Hardware:
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1) SparcStation 20 (50MHz processor), 300+MB RAM, SCSI harddisks
2) Dual Pentium-II 400 (N440BX-based motherboard), 512MB RAM, SCSI harddisk

Versions of other tools:
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flex-2.5.4, gmake

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Problem Description:
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It seems the pg backend disconnects a connection when a user performs an aggregate function on a view. In one instance,
doingso killed the backend. 
I can't seem to duplicate killing the backend, but is this proper behavior for the backend?

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Test Case:
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create table a (b char(20) not null, c char(10) not null, d int, primary key (b, c));
create view d as select b,sum(d) from a group by b;
select max(sum) from d;

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Solution:
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