hugegraph-common/src/main/java/org/apache/hugegraph/iterator/FlatMapperIterator.java [68:80]:
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    protected boolean fetchFromBatch() {
        E.checkNotNull(this.batchIterator, "mapper results");
        while (this.batchIterator.hasNext()) {
            R result = this.batchIterator.next();
            if (result != null) {
                assert this.current == none();
                this.current = result;
                return true;
            }
        }
        this.resetBatchIterator();
        return false;
    }
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hugegraph-common/src/main/java/org/apache/hugegraph/iterator/BatchMapperIterator.java [83:95]:
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    protected final boolean fetchFromBatch() {
        E.checkNotNull(this.batchIterator, "mapper results");
        while (this.batchIterator.hasNext()) {
            R result = this.batchIterator.next();
            if (result != null) {
                assert this.current == none();
                this.current = result;
                return true;
            }
        }
        this.resetBatchIterator();
        return false;
    }
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