TSQL: allow leading GO

[pguyot]

Brief summary of the change made

T-SQL files may start with a leading GO

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

• Added appropriate documentation for the change.

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

[codecov]

Codecov Report

Merging #2997 (9c59b86) into main (939113e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #2997   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          164       164           
  Lines        11987     11987           
=========================================
  Hits         11987     11987           

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

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[tunetheweb]

Couple of questions:

1. Does it support trailing GOs?
2. Does it support multiple GOs in the middle of a file?
3. Depending on 1 end 2 above, would it be better fix to say BatchDelimiterGrammar (Without any other statement) is a permissible statement type in TSQL rather than adding this directly to FileSegment?

[pguyot]

Not sure about what is best for your point 3. The change still supports trailing GOs and multiple GOs in the middle of a file as shown by the test fixture.

[tunetheweb]

OK Let’s leave as is.