Steps to reproduce the issue

Create a Table object on a table in a schema other than public

Expected result

The Table is correctly constructed

Actual result

Error : No columns found for table_name table

Causes

On construction, the table call its getFields() method, which will retrieve the columns information from the postgresql driver by the method getTableColumns($table, $typeOnly = true). The request in this method is hardcoded to only look at the public schema ( joomla-cms/libraries/joomla/database/driver/postgresql.php - line 388).

Looking more closely it seems like there is no support for postgresql schema. Is there any plan to support this functionality in the future ?