Double Quotes in Oracle Column Aliases

SELECT table1.Col1 AS "This is an alias" FROM table1

SQL Error: ORA-03001: unimplemented feature
03001. 00000 -  "unimplemented feature"
*Cause:    This feature is not implemented.

SELECT table1.Col1 AS "This is |not| an alias" FROM table1

select 'test"columnname"' from dual

'TESTCOLUMNNAME'
--------------------------------
test"columnname

select q'#someone's quote#' from dual;