AfterShip / clickhouse-sql-parser / 24572473754

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Add COMMENT support to CREATE VIEW parser (#265)

CREATE VIEW in ClickHouse supports COMMENT between the schema and AS SELECT:

  CREATE VIEW db.v (columns) COMMENT '{...}' AS SELECT ...

The parser previously failed with 'expected EOF or ; but got COMMENT'.

Changes:
- Add Comment field to CreateView struct (ast.go)
- Parse COMMENT clause in parseCreateView before AS (parser_view.go)
- Format COMMENT in CreateView.FormatSQL (format.go)
- Add test case: create_view_with_comment.sql
- Update golden files for existing view tests (new nil Comment field)

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