ANSI: Support CTEs in Merge #6972
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PR Summary
Adds support for Common Table Expressions (CTEs) in MERGE statements for the ANSI SQL dialect, extending parser functionality for a common use case in Spark SQL.
- Added
MergeStatementSegmenttoNonWithNonSelectableGrammarinsrc/sqlfluff/dialects/dialect_ansi.pyto enable CTE support for MERGE - Added comprehensive test coverage in
test/fixtures/dialects/ansi/merge_into.sqldemonstrating MERGE with CTEs - Extended
test/fixtures/dialects/ansi/merge_into.ymlto validate correct parsing of WITH clauses before MERGE statements
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keraion
approved these changes
Jun 29, 2025
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Brief summary of the change made
Fixes #6897. Adds
MERGEto the supported list of statements that can come after a CTE. Added a test to verify the change.Reference: https://www.datacamp.com/tutorial/cte-sql
I discovered this issue when trying to parse production Spark SQL code that is currently running.
Are there any other side effects of this change that we should be aware of?
N/A
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.