Why did pg_relation_filepath does not give a correct path ?

Hi,

according to the documentation, the function pg_relation_filepath
"returns the entire file path name (relative to the database cluster's
data directory PGDATA) of the relation"

When my table are located in the pg_default tablespace, the gievn
relative path is correct

When my table are located on a specific tablespace, this function
returns incorrect dats such as :

pg_tblspc/25310/PG_9.1_201105231/16594/25311

only the "PG_9.1_201105231/16594/25311" is correct.

What does the "pg_tblspc/25310" do ???

How can I obtain the correct relative path ?

Thanks

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