Limit the row list allocation based on the row count

[Francesco Nigro]

Hi all,

Persistent flavour of database isn't limiting the array list of rows based on the row count, 

meaning that a large table count with many alter statements will likely create too much pressure on GC, allocating useless Object[] instances backing the mentioned ArrayList.

The in memory configuration instead is already doing it right and doesn't require the same fix.

I have sent a PR to fix it at  https://github.com/h2database/h2database/pull/3756

Cheers,

Franz