novatechflow commented on PR #839:
URL: https://github.com/apache/wayang/pull/839#issuecomment-6261890746

   Thanks for the contribution. Pls always add regression tests.
   
   - Quoting changes identifier case handling. On HSQLDB, an existing unquoted 
`target_append` becomes `TARGET_APPEND`, but the new SQL targets 
`"target_append"`. Append fails, and overwrite leaves the original table 
untouched.
   - The shared validation rejects valid BigQuery names such as 
`my-project.sales.orders`, including the documented backtick-quoted form.
   
   Reproduced both with focused Java 17 checks. Preserve identifier lookup 
semantics & handle dialect-specific names.


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