Prevented InsertQuery from appending a 'RETURNING' clause when it's not actually interested in the result.  This was causing some problems for Oracle.
Prevented InsertQuery from appending a 'RETURNING' clause when it's not actually interested in the result.  This was causing some problems for Oracle.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@10047 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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