simonvandel commented on code in PR #9020:
URL: https://github.com/apache/arrow-datafusion/pull/9020#discussion_r1468675317
##########
datafusion/common/src/dfschema.rs:
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@@ -218,17 +218,28 @@ impl DFSchema {
if other_schema.fields.is_empty() {
return;
}
+
+ let self_fields: HashSet<&DFField> = self.fields.iter().collect();
Review Comment:
Do you mean constructing the hashsets in a single iteration of fields?
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