Here’s the thing about being an Amazon(s amzn) Web Services software partner: you’re going to be competing with Amazon Web Services. Case in point: On Wednesday at the AWS: Reinvent show, Amazon announced the preview of its Redshift data warehousing service to considerable hubbub — pitching it as a much-less costly competitor to Oracle(s orcl), IBM(s ibm), Hewlett-Packard(s hpq) and Teradata(s tdc