Andy Grove comments

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                                            Andy Grove

Fix inconsistencies in type coercion logic

I updated the title and description now that I understand this more.

move the type coercion out of the optimizer and refactor the optimizer

Spark has an Analysis phase that runs before the optimizer. Maybe we can learn from their model. Within the analysis phase, they have a number of type coercion rules that...

Automate postrelease publishing to Homebrew

Thanks @iajoiner. LGTM. Could you update the release instructions (`dev/release/README.md`) as well as part of this PR? Once that is done we should go ahead and merge this. If we...

Update quarterly_roadmap.md

I think it might be better to move the Ballista roadmap to the Ballista project now

Update quarterly_roadmap.md

I created a PR https://github.com/apache/arrow-ballista/pull/318 to add the Ballista roadmap to the Ballista repo

Update quarterly_roadmap.md

Closing this since the ballista roadmap is now maintained in ballista

Consolidate optimizer passes in optimizer module for better testing

Thanks @alamb. I had been intending to do some work in this direction as well. I think this sounds great.

Consolidate optimizer passes in optimizer module for better testing

@alamb I am working on this now because it became important to something that I am working on for this release

Improve doc on lowercase treatment of columns on SQL

> What do you think about changing the introductory example in the user guide @andygrove ? Given it is the first thing some people see I think there is a...

Add a feature based object store provider

cc @avantgardnerio who has been working on supporting custom object stores in DataFusion/Ballista