jayzhan211 commented on code in PR #9920:
URL: https://github.com/apache/arrow-datafusion/pull/9920#discussion_r1549603208
##########
datafusion/expr/src/function.rs:
##########
@@ -67,6 +88,24 @@ impl<'a> AccumulatorArgs<'a> {
sort_exprs,
}
}
+
+ /// Return a not yet implemented error if IGNORE NULLs is true
+ pub fn check_ignore_nulls(&self, name: &str) -> Result<()> {
+ if self.ignore_nulls {
Review Comment:
But I think there is also a problem that because if they forget to add the
`checking` in the accumulator, they can still run the function but incorrectly
compute unnecessary things, `order by` for example.
To *enforce* they specified the options for their functions, I think we can
implement options directly in `AggregateUDFImpl`.
Either
```rust
// We will check if the AccArgs meet the requirement or not.
fn options() -> Args {
Args {
ignore_nulls: true/ false,
has_ordering: true / false
}
}
```
or
```rust
// The same with this one, but separate each option
fn support_ignore_nulls() -> bool
fn support_ordering() -> bool
```
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