Hi everybody,

We're now doing some research on h2-1.4.192. During code reading of CRUD of 
a MVTable, I'm confused with the design and implementation of updateRows in 
Table.

As far as I know, current Implementation is to first remove the old rows 
and the add new ones. 

I'm wondering what's the target of this implementation. For example, 
whether it is possible for us to keep a column level undo log in 
TransactionStore and change corresponding columns in place at update time? 
Are there any serious problems going to happen under such modification?

Thanks a lot! 

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