Why is there a permission denied error for relation when using the foreign data wrapper extension in GCLOUD Postgres?

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There could be several reasons for a permission denied error when using the foreign data wrapper extension in GCLOUD Postgres. Here are a few possible causes:

1. Insufficient privileges: The user running the query may not have sufficient privileges to access the foreign table or to create a foreign table mapping. Make sure the user has the necessary privileges.

2. Incorrect table or schema name: Double-check that the table and schema names used in the foreign table mapping match the names in the remote database.

3. Network connectivity issues: The remote server hosting the foreign table may be experiencing network connectivity issues or may not be available at the time of the query. Check the status of the remote server.

4. Firewall settings: If the foreign table is hosted on a remote server, ensure that the firewall settings allow for inbound connections to the remote server.

5. Incorrectly configured extension: Make sure that the foreign data wrapper extension is installed correctly and properly configured in the GCLOUD Postgres database.