Fix bug which could generate a NegativeArraySizeException when performing large (>40M) row union operations


git-svn-id: http://h2database.googlecode.com/svn/trunk@5923 e6896862-9d19-0410-bfb3-e9fa5d50e656
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git-svn-id: http://h2database.googlecode.com/svn/trunk@5924 e6896862-9d19-0410-bfb3-e9fa5d50e656