Snowflake: Support UNION (ALL) BY NAME #6994
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PR Summary
Added support for Snowflake's UNION BY NAME and UNION ALL BY NAME syntax, allowing columns to be matched by name rather than position in union operations.
- Modified
src/sqlfluff/dialects/dialect_snowflake.pyto add optionalBY NAMEclause inSetOperatorSegment - Added test case in
test/fixtures/dialects/snowflake/select_union.sqldemonstrating UNION BY NAME syntax - Added corresponding YAML fixture in
test/fixtures/dialects/snowflake/select_union.ymlwith three distinct test cases validating proper AST structure
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Brief summary of the change made
Fixes #6992
Are there any other side effects of this change that we should be aware of?
No
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:
.ymlrule test cases intest/fixtures/rules/std_rule_cases..sql/.ymlparser test cases intest/fixtures/dialects(note YML files can be auto generated withtox -e generate-fixture-yml).test/fixtures/linter/autofix.Added appropriate documentation for the change.
Created GitHub issues for any relevant followup/future enhancements if appropriate.