chenkovsky commented on code in PR #15120:
URL: https://github.com/apache/datafusion/pull/15120#discussion_r1987443250
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datafusion/expr/src/expr.rs:
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@@ -392,11 +392,34 @@ impl Unnest {
}
/// Alias expression
-#[derive(Clone, PartialEq, Eq, PartialOrd, Hash, Debug)]
+#[derive(Clone, PartialEq, Eq, Debug)]
pub struct Alias {
pub expr: Box<Expr>,
pub relation: Option<TableReference>,
pub name: String,
+ pub metadata: Option<std::collections::HashMap<String, String>>,
Review Comment:
yes, only columns/fields have metadata, and it will finally set field's
metadata. but how to use field's metadata directly?
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