jayzhan211 commented on code in PR #11093:
URL: https://github.com/apache/datafusion/pull/11093#discussion_r1650722818
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datafusion/expr/src/expr_schema.rs:
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@@ -314,11 +322,17 @@ impl ExprSchemable for Expr {
}
}
Expr::Cast(Cast { expr, .. }) => expr.nullable(input_schema),
+ Expr::AggregateFunction(AggregateFunction { func_def, .. }) => {
+ match func_def {
+ AggregateFunctionDefinition::BuiltIn(fun) =>
fun.nullable(),
+ // TODO: UDF should be able to customize nullability
Review Comment:
> I'm not sure about whether we need to customize nullability, can we get
the nullabiity based on expression in the function?
I think probably ArrayAgg is the function that we need the nullability be
`false` 🤔
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