yjshen commented on code in PR #2384:
URL: https://github.com/apache/arrow-datafusion/pull/2384#discussion_r862408152
##########
datafusion/common/src/dfschema.rs:
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@@ -133,18 +133,22 @@ impl DFSchema {
/// Modify this schema by appending the fields from the supplied schema,
ignoring any
/// duplicate fields.
pub fn merge(&mut self, other_schema: &DFSchema) {
- for field in other_schema.fields() {
- // skip duplicate columns
- let duplicated_field = match field.qualifier() {
- Some(q) => self.field_with_name(Some(q.as_str()),
field.name()).is_ok(),
- // for unqualifed columns, check as unqualified name
- None => self.field_with_unqualified_name(field.name()).is_ok(),
- };
- if !duplicated_field {
- self.fields.push(field.clone());
+ if !other_schema.fields.is_empty() {
Review Comment:
An earlier return might be cleaner?
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