Dwrite opened a new pull request, #4692:
URL: https://github.com/apache/calcite/pull/4692

   [CALCITE-7279] Fix ClickHouse dialect to wrap nested JOINs with subqueries
   
   ClickHouse does not support nested JOIN syntax directly. When a JOIN's
   right side is another JOIN, it must be wrapped in a SELECT * FROM (...) 
   subquery. This commit ensures that the ClickHouse dialect generates the
   required subquery wrappers for nested JOINs, fixing SQL generation issues.
   


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