docs: public static int calculateFixLengthPartSize(InternalType type) {
  		if (type.equals(InternalTypes.BOOLEAN)) {
  			return 1;
  		} else if (type.equals(InternalTypes.BYTE)) {
  			return 1;
  		} else if (type.equals(InternalTypes.SHORT)) {
  			return 2;
  		} else if (type.equals(InternalTypes.INT)) {
  			return 4;
  		} else if (type.equals(InternalTypes.FLOAT)) {
  			return 4;
  		} else if (type.equals(InternalTypes.CHAR)) {
  			return 2;
  		} else if (type.equals(InternalTypes.DATE)) {
  			return 4;
  		} else if (type.equals(InternalTypes.TIME)) {
  			return 4;
  		} else {
  			// long, double is 8 bytes.
  			// It store the length and offset of variable-length part when type is string, map, etc.
  			return 8;
  		}
  	}