COPY big row returns ERROR: invalid memory alloc request size

Hi

I have problem with Postgres replication failing and it seems to be related to very big rows.

Here is an example

SELECT rep_id, pg_column_size(version_union_tables_r03.harvested_per_object.*) from version_union_tables_r03.harvested_per_object  where rep_id = 778;

If I create TEMP table it works OK with that row.

CREATE temp table test as (select * from version_union_tables_r03.harvested_per_object where rep_id = 778);                                                                                                                                      

If I run the COPY cmd it fails

COPY (select * FROM version_union_tables_r03.harvested_per_object where rep_id = 778)  TO STDOUT;

Any ideas on how can get around this problem for postgres replication without changing the table def ?

Here is the table def.

Table "version_union_tables_r03.harvested_per_object"     "version_union_tables_r03_pub"

Thanks

Lars