public int sizeIdx2size(int sizeIdx) {
    return sizeIdx2sizeTab[sizeIdx];
  }
Returns the memory block size for a given size class index.

@param sizeIdx The index of the size class.
@return The memory block size corresponding to the size class index.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/binaryallocator/utils/SizeClasses.java