BUG #7714: Error Message related to "sql_implementation_info" when itś not part of the query...

The following bug has been logged on the website:

Bug reference:      7714
Logged by:          Cláudio Bezerra Leopoldino
Email address:      claudiob_br@yahoo.com.br
PostgreSQL version: 9.2.1
Operating system:   Linux - Ubuntu
Description:

I dont know if its an error or an expected behavior, but it seems strange to
me.

I was testing table privilege functions and a inusual message appeared,
related to "sql_implementation_info" when itś not part of the query.

The commands to induce the mesage appear above:

postgres=# SELECT 'r1' as TABELA, has_table_privilege('postgres', 'r1',
'SELECT') AS SELECT;
 tabela | select
--------+--------
 r1     | t
(1 registro)

postgres=# SELECT tablename as TABELA, has_table_privilege('postgres',
tablename, 'SELECT') AS SELECT FROM pg_tables;
ERRO:  relação "sql_implementation_info" não existe

postgres=# SELECT version();
                                      version

---------------------------------------------------------------------------------------------------------
 PostgreSQL 9.2.1 on i686-pc-linux-gnu, compiled by gcc-4.4.real (Ubuntu
4.4.3-4ubuntu5.1) 4.4.3, 32-bit
(1 registro)

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