findepi commented on code in PR #11256:
URL: https://github.com/apache/datafusion/pull/11256#discussion_r1666408825
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datafusion/expr/src/expr_schema.rs:
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@@ -322,10 +322,16 @@ impl ExprSchemable for Expr {
}
}
Expr::Cast(Cast { expr, .. }) => expr.nullable(input_schema),
- Expr::AggregateFunction(AggregateFunction { func_def, .. }) => {
+ Expr::AggregateFunction(AggregateFunction { func_def, args, .. })
=> {
match func_def {
+ // TODO: min/max over non-nullable input should be
recognized as non-nullable
AggregateFunctionDefinition::BuiltIn(fun) =>
fun.nullable(),
// TODO: UDF should be able to customize nullability
+ AggregateFunctionDefinition::UDF(udf)
+ if udf.name() == "count" && args.len() <= 1 =>
Review Comment:
> I think `args.len() <= 1` is unnecessary, or am I overlooking something?🤔
I don't know of `count(a,b)` function. If it is added in the future, would
it be necessarily always producing non-null values?
> Instead of pattern matching all the possible function name [...]
absolutely agree, that's why i add this comment:
https://github.com/apache/datafusion/pull/11256#discussion_r1666020300
thanks for filing the issue
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