public void merge()

in spark-load/spark-load-common/src/main/java/org/apache/doris/common/io/Hll.java [186:236]
51 lines of code
17 McCabe index (conditional complexity)

    public void merge(Hll other) {
        if (other.type == HLL_DATA_EMPTY) {
            return;
        }
        switch (this.type) { // CHECKSTYLE IGNORE THIS LINE: missing switch default
            case HLL_DATA_EMPTY:
                this.type = other.type;
                switch (other.type) { // CHECKSTYLE IGNORE THIS LINE: missing switch default
                    case HLL_DATA_EXPLICIT:
                        this.hashSet.addAll(other.hashSet);
                        break;
                    case HLL_DATA_SPARSE:
                    case HLL_DATA_FULL:
                        this.registers = new byte[HLL_REGISTERS_COUNT];
                        System.arraycopy(other.registers, 0, this.registers, 0, HLL_REGISTERS_COUNT);
                        break;
                }
                break;
            case HLL_DATA_EXPLICIT:
                switch (other.type) { // CHECKSTYLE IGNORE THIS LINE: missing switch default
                    case HLL_DATA_EXPLICIT:
                        this.hashSet.addAll(other.hashSet);
                        if (this.hashSet.size() > HLL_EXPLICIT_INT64_NUM) {
                            convertExplicitToRegister();
                            this.type = HLL_DATA_FULL;
                        }
                        break;
                    case HLL_DATA_SPARSE:
                    case HLL_DATA_FULL:
                        convertExplicitToRegister();
                        mergeRegisters(other.registers);
                        this.type = HLL_DATA_FULL;
                        break;
                }
                break;
            case HLL_DATA_SPARSE:
            case HLL_DATA_FULL:
                switch (other.type) { // CHECKSTYLE IGNORE THIS LINE: missing switch default
                    case HLL_DATA_EXPLICIT:
                        for (long value : other.hashSet) {
                            update(value);
                        }
                        break;
                    case HLL_DATA_SPARSE:
                    case HLL_DATA_FULL:
                        mergeRegisters(other.registers);
                        break;
                }
                break;
        }
    }