Port Bug Report: "drop database DBNAME;" command has critical bug!!!

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               : KiBaek Jeong
Your email address      : hannoory@chollian.net

Category                : runtime: back-end
Severity                : critical

Summary: "drop database DBNAME;" command has critical bug!!!

System Configuration
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  Operating System   : Solaris 2.5.1

  PostgreSQL version : 6.4.2

  Compiler used      : gcc 2.8.1

Hardware:
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SunOS main 5.5.1 Generic_103640-12 sun4u sparc SUNW,Ultra-1

Versions of other tools:
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GNU Make version 3.77
flex version 2.5.4

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Problem Description:
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0. psql template1
1. create database hahaha;
2. \c hahaha
3. create table xxx (i int, c char(30), content text);
4. \c template1
5. DROP DATABASE hahaha;
THEN...
6. CREATE DATABASE hahaha;
And THEN, I hope "hahaha" database don't have any tables.
But type \d then, newly "hahaha" database has
previous "xxx" table!!!!!
It's critical error to me.
At this period, if I try to delete this strange xxx table,
then backend prints "ERROR1" -> Message is
"ERROR:  cannot find attribute 1 of relation xxx"
For solving the problem... I must kill my postmaster server.
Then error is cleared.(xxx table is cleared)
But there is still this entire problems... Please help me.


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Test Case:
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0. psql template1
1. create database hahaha;
2. \c hahaha
3. create table xxx (i int, c char(30), content text);
4. \c template1
5. DROP DATABASE hahaha;
THEN...
6. CREATE DATABASE hahaha;
7. \c hahaha
8. \d
   EXIST!, xxx table!!! it's error!
9. select * from xxx;
   THEN, ERROR:  cannot find attribute 1 of relation xxx


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Solution:
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