There are currently 3 sets of GROUP BY tests:
The first two tests are JUnit tests; the groupBy.sql tests are old-style harness tests,
although they are now run in the JUnit framework using the LangScripts technique.
This sub-task proposes to convert the groupBy.sql tests to JUnit tests, and to include
them directly into GroupByTest.java.
DERBY-2151 conversion tool can be used to assist in the conversion process.