jayzhan211 commented on code in PR #11989:
URL: https://github.com/apache/datafusion/pull/11989#discussion_r1717148941
##########
datafusion/expr/src/expr_schema.rs:
##########
@@ -328,10 +328,45 @@ impl ExprSchemable for Expr {
Ok(true)
}
}
+ Expr::WindowFunction(WindowFunction { fun, .. }) => {
+ match fun {
+ WindowFunctionDefinition::BuiltInWindowFunction(func) => {
+ if func.name() == "ROW_NUMBER"
+ || func.name() == "RANK"
+ || func.name() == "NTILE"
+ || func.name() == "CUME_DIST"
+ {
+ Ok(false)
+ } else {
+ Ok(true)
+ }
+ }
+ WindowFunctionDefinition::AggregateUDF(func) => {
+ // TODO: UDF should be able to customize nullability
+ if func.name() == "count" {
+ // TODO: there is issue unsolved for count with
window, should return false
Review Comment:
Not so familiar with window function yet, leave it as TODO
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