jdbc result set metadata: getting physical column names on aliased columns

I'm using jdbc to execute query statements (in jruby)

# made-up example
sql = "select " +
         "c.type as cartype, " +
         "o.id as ownerid, " +
         "o.type as ownertype " +
       "from cars c " +
         "inner join owners o " +
         "on c.vin = o.vin"
# 'stmt' gotten with jdbc-connection.create_statement() 
result_set = stmt.execute_query(sql)开发者_开发问答
meta_data = result_set.get_meta_data()
col_count = result_set.get_column_count()

I can query the various column aliases (get_column_name) and tables (get_table_name) for each column through the column indexes, but I also need the actual/physical names of the columns, un-aliased.

How do I get the physical/actual name of column, as it is defined in the schema ("ownerid" column alias is column "id", for instance)?

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From tests with other database types, it looks as though this is database+driver specific. Using mysql get_column_name returns the actual/physical column name while get_column_label returns the alias. As an aside, both database types (mysql and sqlite) return the physical table name through get_table_name.