ENG-7152 handle better -J sqlcmd command line option

(cherry picked from commit 06fbc47d55c79124479706a50697d766b0395dcd)
Update Volt extensions to HSQL parser to be more selective when determining referent of SIMPLE_COLUMN.

(cherry picked from commit a064049608d343e096c1534bbb394585ce2cb9c4)

Conflicts:
	tests/testprocs/org/voltdb_testprocs/regressionsuites/fixedsql/fixed-sql-ddl.sql
Remove comment I made that I now think is incorrect.

(cherry picked from commit fa0710a81d4ea865c4fce8ba3ecbcb138f789e6a)
ENG-6962 multi-column distinct accidentally enabled for wrong answer

(cherry picked from commit f5d887f7bc04c182184b9424234464362f81412d)