shyjsarah opened a new issue, #25823:
URL: https://github.com/apache/datafusion/issues/25823

   ### Is your feature request related to a problem or challenge?
   
   DataFusion embedders may want to allow DML operations such as INSERT into 
registered table providers while disallowing COPY, which writes query results 
to a file or object store. SQLOptions currently groups COPY under allow_dml, so 
disabling COPY also disables all other DML.
   
   ### Describe the solution you'd like
   
   Add SQLOptions::with_allow_copy(bool), defaulting to true. When false, 
SQLOptions::verify_plan should reject LogicalPlan::Copy while continuing to 
allow other DML. For backwards compatibility, with_allow_dml(false) should 
continue to reject COPY.
   
   ### Describe alternatives you've considered
   
   An embedder can inspect each LogicalPlan before execution, but that 
duplicates SQLOptions traversal and requires a separate execution path instead 
of using sql_with_options.
   
   ### Additional context
   
   COPY is already represented by its own LogicalPlan variant, so it can be 
controlled independently without changing the logical plan model.
   


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