skip count_by_sql test using COUNT(DISTINCT) for sqlite2 only
skip count_by_sql test using COUNT(DISTINCT) for sqlite2 only

git-svn-id: afc9fed30c1a09d8801d1e4fbe6e01c29c67d11f@3978 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

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