we recently wrote about the MERGE command at the delta.io blog (https://delta.io/blog/2023-02-14-delta-lake-merge/) - it includes a section on handling `null`s in your changeset by leveraging

case/when

expressions - there's been questions here specifically on handling this so i'm sharing here too... it's hard to fit everything in one post so we do plan to build on this - please leave a comment if there's something you'd like to see!