0004-getTableColumns-for-another-schema.txt

Steps to reproduce the issue

• install Joomla with PostgreSQl driver.
• create a new schema (for example 'test')
• create a new table in this schema

CREATE TABLE test.customer (
  id SERIAL,
  name VARCHAR(100),
  PRIMARY KEY(id)
) 
WITH (oids = false);

• in code call getTableColumns for this table

$db = JFactory::getDBO();
$custfields=$db->getTableColumns('test.customer'); 

Expected result

Array with fields of table

Actual result

Empty array

System information (as much as possible)

PostgreSQL Joomla driver using (important!)
Any operation system (Windows or Linux for me)
Joomla 3.9.6 (or staging)
PostgreSQL 10 (or other)

Additional comments

A fixed this bag (see attached patch)