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Fix bug where L018 warns inappropriately if CTE definition includes a column list #3227

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@barrywhart barrywhart commented Apr 29, 2022

Brief summary of the change made

Fixes #2851

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.

@barrywhart barrywhart marked this pull request as draft April 29, 2022 14:53
@@ -72,4 +73,5 @@
"RegexLexer",
"Parser",
"Matchable",
"IdentitySet",
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Exposing IdentitySet at the sqlfluff.core.parser module level since it's useful outside of the parser (i.e. for rules).

@@ -45,4 +46,5 @@
"Indent",
"Dedent",
"TemplateSegment",
"IdentitySet",
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@barrywhart barrywhart Apr 29, 2022

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Exposing IdentitySet at the sqlfluff.core.parser.segments module level since it's useful outside of the parser (i.e. for rules).

for seg in context.segment.iter_segments(
expanding=["common_table_expression", "bracketed"], pass_through=True
):
if seg.name == "start_bracket":
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Review this section with "Hide whitespace" checked

.last(sp.is_type("bracketed"))
.children()
.last(sp.is_name("end_bracket"))[0]
)
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This code could've been simplified or avoided if CTEDefinitionSegment had segment definitions for the optional column list and/or the query part. I thought about it, but at least one dialect besides ANSI specializes CTEDefinitionSegment, so let's do it here instead. Something to keep in mind, though, if in future we have other rules with similar needs.

@barrywhart barrywhart marked this pull request as ready for review April 29, 2022 15:02
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codecov bot commented Apr 29, 2022

Codecov Report

Merging #3227 (4b40c24) into main (322026e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #3227   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          166       166           
  Lines        12365     12367    +2     
=========================================
+ Hits         12365     12367    +2     
Impacted Files Coverage Δ
src/sqlfluff/core/parser/__init__.py 100.00% <ø> (ø)
src/sqlfluff/core/parser/segments/__init__.py 100.00% <ø> (ø)
src/sqlfluff/rules/L018.py 100.00% <100.00%> (ø)

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@barrywhart barrywhart merged commit 0aa727f into sqlfluff:main Apr 29, 2022
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L018 incorrectly fails on recursive Snowflake CTE
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