- in 10.1, varchar endspace was bzero-ed 

archive depended on it to not pack garbage

- in 10.2, varchar endspace is not bzero-ed

 which breaks the archive SE.

Was this change intended?

If yes, then we should update ha_archive to fill the garbage parts of the buffer with zeroes that will cause it to be (slightly?) slower  but there's no other way.

BR,

Varun