public int getSizeInBytes() {
        return sizeInBytes;
    }
Construct a new UnsafeRow. The resulting row won't be usable until `pointTo()` has been called,
since the value returned by this constructor is equivalent to a null pointer.

@param numFields the number of fields in this row
indexr-query-opt/src/main/java/io/indexr/query/row/UnsafeRow.java