DERBY-6304: Remove unused methods in Predicate

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1507211 13f79535-47bb-0310-9956-ffa450edef68
DERBY-4378: Create test cases for MultiProbeTableScanResultSet with duplicates in the probe list

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1507212 13f79535-47bb-0310-9956-ffa450edef68