query corruption for complexer queries on -current?

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Michael Reifenberger
Your email address : root(at)nihil(dot)plaut(dot)de

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

Operating System (example: Linux 2.0.26 ELF) : FreeBSD 4.x -current

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

Compiler used (example: gcc 2.8.0) : 2.7.2.1

Please enter a FULL description of your problem:
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using the structure from a.sql, populating with some entries, using the query in
sel_reise.sh (with hitting some tuples) I get only a subset (1 entry!) of the
matching tuples. Delting all lines in sel_reise.sh where 'e.*' is used
(3.lines), I get all tuples. The same script works without errors on pgsql 6.3
using the same data.

Some stats with my original data:

abr=> select count(*) from reise where begt > 'Feb 01 00:00:00 1999';
count
-----
13
(1 row)

abr=> select distinct mid from reise where begt > 'Feb 01 00:00:00 1999';
mid
---
605
(1 row)

abr=> select distinct mid from emp;
mid
---
0
605
(2 rows)

Any clues?

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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see above

Bye!
----
Michael Reifenberger
Plaut Software GmbH, R/3 Basis