Bug Report - alter table does not work on temporary tables

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Clark Evans
Your email address : clark(dot)evans(at)manhattanproject(dot)com

System Configuration
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Architecture (example: Intel Pentium) : Pentium

Operating System (example: Linux 2.0.26 ELF) : Linux RH 5.2

PostgreSQL version (example: PostgreSQL-6.4) : Current CVS version

Compiler used (example: gcc 2.8.0) :

Please enter a FULL description of your problem:
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Alter table does not seem to operate on tempoary tables
and does not throw an error. I would like to be able
to add columns to temp tables to do a cross-tab query.

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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clark=> create temp table x ( x text );
CREATE
clark=> insert into x values ( 'x' );
INSERT 270675 1
clark=> select * from x;
x
-
x
(1 row)

clark=> alter table x add column y text;
ADD
clark=> select * from x;
x
-
x
(1 row)

clark=> insert into x values ('a','b');
ERROR: INSERT has more expressions than target columns.

If you know how this problem might be fixed, list the solution below:
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The only work-around I know is to use arrays. I'm trying that.