public long sizeOf() {
    return INSTANCE_SIZE + shallowSizeOf(array) + (segments * SIZE_OF_SEGMENT);
  }
Returns the size of this big array in bytes.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/relational/aggregation/grouped/array/DoubleBigArray.java