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This patch adds two more tests for the unimplemented Select=COUNT feature (which asks to only count queried items and not return the actual items). Because this feature has not yet been implemented in Alternator (Refs #5058), the new tests xfail. They pass on DynamoDB. The two tests added here are for the interaction of the Select=COUNT feature with filters - in one of the two supported syntaxes (QueryFilter and FilterExpression). We want to verify that even though the user doesn't need the content of the items (since only the counts were requested), they are still retrieved from disk as needed for doing proper filtering - but not returned. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20211124225429.739744-1-nyh@scylladb.com>