Dandandan commented on code in PR #15254:
URL: https://github.com/apache/datafusion/pull/15254#discussion_r1997646536
##########
datafusion/expr/src/utils.rs:
##########
@@ -1000,6 +1000,107 @@ pub fn can_hash(data_type: &DataType) -> bool {
}
}
+/// Metadata for the columns should be null
+pub type NullColumnsSet<'a> = HashSet<(Option<&'a TableReference>, &'a
String)>;
+
+/// Determines if an expression will always evaluate to null
+pub fn evaluates_to_null(expr: &Expr, null_columns: &NullColumnsSet<'_>) ->
bool {
+ match expr {
Review Comment:
I wonder if we can use the const evaluator instead?
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