presto-kudu/src/main/java/io/prestosql/plugin/kudu/TypeHelper.java/TypeHelper/getDouble
class TypeHelper:    public static double getDouble(Type type, RowResult row, int field)
    {
        if (type == DoubleType.DOUBLE) {
            return row.getDouble(field);
        }
        throw new IllegalStateException("getDouble not implemented for " + type);
    }