Malcolm Taylor created CALCITE-2164:

             Summary: Fix alerts raised by
                 Key: CALCITE-2164
             Project: Calcite
          Issue Type: Improvement
            Reporter: Malcolm Taylor
            Assignee: Malcolm Taylor has identified a number of places where the code can be improved by 
small changes. These include cases of
 * container contents never accessed (so the container can be removed)
 * reference equality test on boxed types (equals can be used instead)
 * type mismatch on container access (presumably checking for the wrong object)
 * boxed variable is never null (primitive type can be used instead)
 * dereferenced variable may be null (test for null should be added)
 * useless comparison test (the test can be removed)

This issue is to address some of these alerts

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