alamb commented on issue #5617:
URL: 
https://github.com/apache/arrow-datafusion/issues/5617#issuecomment-1473616145

   > What is the outcome of the SQL query SELECT ... WHERE col LIKE $1? 🤔
   
   It is a `LogicalPlan` with `Expr::Placeholder` entries. It will error during 
physical planning if the parameters are not supplied with 
https://docs.rs/datafusion/20.0.0/datafusion/dataframe/struct.DataFrame.html#method.with_param_values
   
   However, today DataFusion will not create the LogicalPlan at all (it will 
error because it cant infer the type of `$1` and that type is needed for the 
rest of the analysis)


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