Fixed a deadlock related to very large temporary result sets.

git-svn-id: http://h2database.googlecode.com/svn/trunk@4838 e6896862-9d19-0410-bfb3-e9fa5d50e656
MVTableEngine

git-svn-id: http://h2database.googlecode.com/svn/trunk@4839 e6896862-9d19-0410-bfb3-e9fa5d50e656
Test

git-svn-id: http://h2database.googlecode.com/svn/trunk@4840 e6896862-9d19-0410-bfb3-e9fa5d50e656