private void assertIndexIsValid(int index) {
        assert index >= 0 : "index (" + index + ") should >= 0";
        assert index < numFields : "index (" + index + ") should < " + numFields;
    }
The size of this row's backing data, in bytes)
indexr-query-opt/src/main/java/io/indexr/query/row/UnsafeRow.java