Current syntax:
select COLUMN from ((select COLUMN from TABLE1) as TABLE2)

Correct syntax:
select COLUMN from (select COLUMN from TABLE1) as TABLE2

SqlSet SqlSelect::AsTable(const SqlId& tab) const
{
	StringBuffer t;
	t << SqlCase(MSSQL|PGSQL, "")("(") //<---PGSQL added
	<< "(" << text << ") as \t" << tab.ToString() << '\t'
	<< SqlCase(MSSQL|PGSQL, "")(")");  //<---PGSQL added
	return SqlSet(String(t), SqlSet::HIGH);
}