cognos greenplum pg_catalog
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I am using Cognos report and Greenplum database.

My report is taking too much time too run. So I looked at the green plum log, and discover that half of the time where spent querying the pg_catalog. In the catalog i am not looking at the pg_catalog but on other tables, so i don't understand why the cognos decide to look at the pg_catalog table. 

When i run cognos report i can see from the greenplum log, that a for some of the query, cognos run select on pg_catalog before running the query.

Why is this?