public void set(long index, Binary value) {
    updateRetainedSize(index, value);
    array.set(index, value);
  }
Sets the element of this big array at specified index.

@param index a position in this big array.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/relational/aggregation/grouped/array/BinaryBigArray.java