General Bug Report: pg_attribute a.attlen does not return correct values

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Dinh Le
Your email address : dinh(at)flic(dot)net

Category : runtime: back-end
Severity : non-critical

Summary: pg_attribute a.attlen does not return correct values

System Configuration
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Operating System : Linux 2.0.36

PostgreSQL version : 6.4.2

Compiler used : gcc 2.7.2

Hardware:
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Versions of other tools:
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gnu make

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Problem Description:
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Execute the following SQL command

SELECT a.attnum, a.attname, t.typname, a.attlen,
a.atttypmod, a.attnotnull, a.atthasdef
FROM pg_class c, pg_attribute a, pg_type t
WHERE c.relname = 'a table'
and a.attnum > 0
and a.attrelid = c.oid
and a.atttypid = t.oid
ORDER BY attnum;

used to return the correct value for a.attlen. The
current Postgres 6.4.2 for Linux always return -1.

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Test Case:
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Run psql and execute the SQL command

SELECT a.attnum, a.attname, t.typname, a.attlen,
a.atttypmod, a.attnotnull, a.atthasdef
FROM pg_class c, pg_attribute a, pg_type t
WHERE c.relname = 'table'
and a.attnum > 0
and a.attrelid = c.oid
and a.atttypid = t.oid
ORDER BY attnum;

where 'table' is an existing table.

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Solution:
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