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65381bd155
The DynamoDB documentation https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html describes several hard limits on the size of the size of expressions (ProjectionExpression, ConditionExpression, UpdateExpression, FilterExpression) and various elements they contain. In this patch we begin testing those limits with a comprehensive test for the *length* of each of these four expressions: we test that lengths up to (and including) 4096 bytes are allowed but longer expressions are rejected. We also add TODOs for additional documented limits that should be tested in the future. Currently, this test passes on DynamoDB but xfails on Alternator because Alternator does *not* enforce any limits on the expression length. I don't think this is a real problem, and we may consider keeping it this way, but we should at least be aware that this difference exists and an xfailing test will remind us. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20210810081948.2012120-2-nyh@scylladb.com>