how to append a new column to hdb file?

hi,
    I have stored some hdb files, but, now, I have to modify the table schema, so the hdb data need to be modified too. Is there a function for me to add a new column to the hdb files directly?

This guy is pretty useful

http://code.kx.com/wiki/Contrib/dbmaintdotq

Thanks!

? 2016?1?4??? UTC+8??6:29:12?manish patel???

This guy is pretty useful

http://code.kx.com/wiki/Contrib/dbmaintdotq