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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Filip Zawadiak
Your email address : philz(at)vyx(dot)net

System Configuration
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Architecture (example: Intel Pentium) : Intel Pentium

Operating System (example: Linux 2.0.26 ELF) : Linux 2.2.5 ELF

PostgreSQL version (example: PostgreSQL-6.4) : PostgreSQL-6.5b

Compiler used (example: gcc 2.8.0) : egcs-2.91.66

Please enter a FULL description of your problem:
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Backend terminates with this message:

TRAP: Failed Assertion("!(tle->expr != ((void *)0)):", File: "tlist.c", Line: 549)

!(tle->expr != ((void *)0)) (0)

Following example is not only one, generally anything what uses
aggregates and inheritance at same time usually doesn't work.

This problem is not a new one, as it was exactly the same with
postgres 6.3...

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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create table at(a int);
create table bt(b int) inherits (at);
create table ct(c int, d timespan);

insert into bt values (0,0);
insert into ct values (0,'@ 2 hours');

select date_part('day',sum(d)) from ct,at* where c = a;

If you know how this problem might be fixed, list the solution below:
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