presto-main/src/main/java/io/prestosql/operator/index/FieldSetFilteringRecordSet.java/FieldSetFilteringRecordSet/Field
class FieldSetFilteringRecordSet:        public Field(int field, MethodHandle equalsMethodHandle)
        {
            this.field = field;
            this.equalsMethodHandle = requireNonNull(equalsMethodHandle, "equalsMethodHandle is null");
        }