Chen-Yuan-Lai commented on issue #14432:
URL: https://github.com/apache/datafusion/issues/14432#issuecomment-2658302749
Hi @eliaperantoni sorry for the long delay. I’ve been taking some time to
familiarize myself with this issue. I found that the "wrong number of argument"
error may occur in different places depending on what function is called. For
example,
1. `select sum(1, 2);` (`TypeSignature::UserDefined`) : error message is
"Execution error: sum function requires 1 argument, got 2"
2. `select ascii('abc', 'def');` (`TypeSignature::String` or other) :
error message is "Function 'ascii' expects 1 arguments but received 2"
Should I:
1. Implement a function to check the number of arguments for all the
`TypeSignature `variants, and attach corresponding `Diagnostic ` to
`DataFusionError`?
2. Attach `Diagnostic ` to `DataFusionError` in different places?
Another stupid question is how to test the queries above correctly because I
always get "expected diagnostic" error even though I have attached `Diagnostic
`
```rust
return plan_err!(
"Function '{function_name}' expects {expected_length}
arguments but received {length}"
).map_err(|err| {
err.with_diagnostic(
Diagnostic::new_error(
format!("Function '{function_name}' expects
{expected_length} arguments but received {length}"),
None,
)
)
});
```
Is something wrong with this or do I need to do something else?
These are problems I met in this issue, I am looking forward to some hints
or ideas, thanks so mush!
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