Add Db2 dialect

[ddresslerlegalplans]

Brief summary of the change made

Fixes #3229

Are there any other side effects of this change that we should be aware of?

Not that I am aware of

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Please confirm you have completed any of the necessary steps below.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[ddresslerlegalplans]

Thanks for the review, I've addressed all issues. Let me know if I need to squash commits and rename the first commit from "Add Db2 for i dialect" to "Add Db2 dialect"

[tunetheweb]

Let me know if I need to squash commits and rename the first commit from "Add Db2 for i dialect" to "Add Db2 dialect"

No need as we squash on merge. In fact we prefer you NOT to squash commits in case we want to see what’s changed since last time we viewed.

[tunetheweb]

Looks pretty good. Couple of suggested changes.

Also could you update the main README.md to list this as a dialect too?

[tunetheweb]

Also looks like you need to run black.

This can be done automatically for changed files on commit using pre-commit: https://github.com/sqlfluff/sqlfluff/blob/main/CONTRIBUTING.md#pre-commit-config

[codecov]

Codecov Report

Merging #3231 (4cac2d0) into main (5efff59) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #3231   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          166       167    +1     
  Lines        12417     12423    +6     
=========================================
+ Hits         12417     12423    +6     

Impacted Files	Coverage Δ
src/sqlfluff/core/dialects/__init__.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_db2.py	100.00% <100.00%> (ø)

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[tunetheweb]

I think this looks good to me. You happy to merge now or still working on other changes?

[ddresslerlegalplans]

I'm happy with a merge now. Thanks again for the help and review.

[tunetheweb]

I'm happy with a merge now. Thanks again for the help and review.

Thank YOU for working in this!

[tunetheweb]

https://twitter.com/SQLFluff/status/1521208357176102915?s=20&t=LHzHIkUT9KW9I8F0wNUcSg