alamb commented on issue #4539:
URL: https://github.com/apache/datafusion/issues/4539#issuecomment-2226145983
> What's the best way to handle `?` placeholder in datafusion? For example,
`select * from t where a = ?`, it could be converted to a logical plan in
datafusion, but the plan can't be updated with param values.
I tried this in datafusion CLI and it looks like `?` is created with a
logical plan with a Placeholder with id `?`
```
> select '1' where 4 = ?;
This feature is not implemented: Physical plan does not support logical
expression Placeholder(Placeholder { id: "?", data_type: Some(Int64) })
```
So you can probably use
https://docs.rs/datafusion/latest/datafusion/dataframe/struct.DataFrame.html#method.with_param_values
and use a ParamValues::Map (key name `"?"`
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