Change redshift diststyle behavior

[rodrigodelmonte]

resolves #2246

Description

• Don't provide a diststyle to redshift tables when configured as "auto"

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt next" section.

[cla-bot]

Thanks for your pull request, and welcome to our community! We require contributors to sign our Contributor License Agreement and we don't seem to have your signature on file. Check out this article for more information on why we have a CLA.

In order for us to review and merge your code, please submit the Individual Contributor License Agreement form attached above above. If you have questions about the CLA, or if you believe you've received this message in error, don't hesitate to ping @drewbanin.

CLA has not been signed by users: @rodrigodelmonte

[drewbanin]

Thanks @rodrigodelmonte! This looks good to me -- i'll kick off the tests here :)

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[drewbanin]

The code here LGTM!

One more quick change request though -- can you add yourself to the list of Contributors for this release in the CHANGELOG.md file? We want to make sure you get credit for your contribution :D

Thanks!

[rodrigodelmonte]

@drewbanin
Thanks for the reminder, done!

[drewbanin]

Alright alright, thanks @rodrigodelmonte! It looks like there's a changelog merge conflict - do you mind if I fix that up for you real quick? I'm happy for you to do it as well, lmk if you'd like a hand at all. Going to ship this as soon as that conflict is addressed!

[rodrigodelmonte]

@drewbanin Let me know if it is fine now!
Should I have just one commit or can you squash the 2 commits ?

[drewbanin]

This is great as-is. I'm going to merge it presently. Thanks for contributing to dbt!