presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/SchemaTableNameMapper.java/SchemaTableNameMapper/map
class SchemaTableNameMapper:    @Override
    public SchemaTableName map(int index, ResultSet r, StatementContext ctx)
            throws SQLException
    {
        return new SchemaTableName(
                r.getString("schema_name"),
                r.getString("table_name"));
    }