DERBY-3155: Materialize LOBs before buffering them up for processing by WHEN [ NOT ] MATCHED clauses; commit derby-3155-44-aa-lobsInTriggers.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1578535 13f79535-47bb-0310-9956-ffa450edef68