Determine current running query, but no query in pg_stat_activity

Hi,

I have a process running and I am trying to work out what it is doing.
Supposedly it is running a SELECT

23093 ? R 6:35 postgres: lubrook bugasbase SELECT

However in pg_stat_activity, I get no current_query

bugasbase=# SELECT * from pg_stat_activity ;
datid | datname | procpid | usesysid | usename | current_query |
query_start
----------+-----------+---------+----------+---------+---------------+------
-------
80573819 | bugasbase | 23117 | 1 | pgsql | |
80573819 | bugasbase | 23093 | 109 | lubrook | |

Shouldn't there be something in current_query?

Thanks for any advice

Adam

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