this has been unmaintained for a very long time, mostly because there is an active forked project based on this, so people should rather be using that

(MySql/ORACLE - SQL style)

Command failed silently corrupting the changed column.
Before the change (added after v1.4.196) following was observed:
 alter table T modify C int null; -- Worked as expected
 alter table T modify C null;     -- Silently corrupted column C

It's already implemented and working:
https://github.com/h2database/h2database/pull/150

The statement "shutdown defrag" now compresses the database (with the MVStore). The MVStore now automatically shrinks the file in the background if there is no read or write activity. This might be a bit too aggressive; feedback is welcome!

    MySQL compatibility: support REPLACE INTO as an alias for MERGE INTO.
it has recently been implemented