Separated Vertica SQL dialect from Ruby vertica driver. Added ODBC

[abramclark]

No description provided.

[abramclark]

@camilo how does this look?

[camilo]

@abramclark interesting!;
So the intention is to add the ODBC driver?

I don't fully understand the refactor that moves some code to lib/sequel/adapters/shared/vertica.rb what is the intention there?

[abramclark]

@camilo sequel/adapters/shared/vertica.rb is just for SQL generation, and sequel/adapters/vertica is for code that depends on the Ruby Vertica driver. I based this off of recommendations from Jeremy, the sequel maintainer, and basically copied code from mysql, mssql, etc adapters. The ODBC functionality is working for me in testing, and I may be using it in production soon. This was motivated by my org requiring all DB connections to use ODBC.

[abramclark]

@camilo there's a major issue where model.save returns the first instance in the collection instead of the one created. I mostly fixed it for the ODBC version, but since I don't use the Ruby vertica driver I have no plans to fix it there too.