duplicated block id: 1
size: 11 cleaned lines of code
in 2 files:
 - hugegraph-common/src/main/java/org/apache/hugegraph/iterator/FlatMapperIterator.java (68:80)
 - hugegraph-common/src/main/java/org/apache/hugegraph/iterator/BatchMapperIterator.java (83:95)