Port Bug Report: Get a 'ERROR: nodeRead: Bad type 0'

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Mathijs Brands
Your email address : shrike(at)il(dot)fontys(dot)nl

Category : runtime: back-end
Severity : critical

Summary: Get a 'ERROR: nodeRead: Bad type 0'

System Configuration
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Operating System : Linux 2.2.7 (glibc 2.0/redhat 5.2 w/ patches)

PostgreSQL version : 6.5

Compiler used : gcc 2.7.2.3

Hardware:
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Linux bucephalus.dynip.com 2.2.7 #3 Sun Jun 20 09:26:47 CEST 1999 i686 unknown

Versions of other tools:
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flex 2.5.4, bison 1.25

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Problem Description:
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After creating my database, I get the following error:
ERROR: nodeRead: Bad type 0

After that, I can still query the database, but I can't
do anything else with it anymore (dump, \d).

This is very reproducible and doesn't happen with
6.3.2.

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Test Case:
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I have a couple of insert statements that cause this problem
every time. I can send a transcript, if you like.

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Solution:
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