westonpace commented on code in PR #36418:
URL: https://github.com/apache/arrow/pull/36418#discussion_r1254540363
##########
cpp/src/arrow/array/array_nested.cc:
##########
@@ -611,9 +611,10 @@ const std::shared_ptr<Array>& StructArray::field(int i)
const {
return boxed_fields_[i];
}
-std::shared_ptr<Array> StructArray::GetFieldByName(const std::string& name)
const {
+const std::shared_ptr<Array>& StructArray::GetFieldByName(const std::string&
name) const {
+ static std::shared_ptr<Array> null;
Review Comment:
A static like this is also an implicit mutex so it has the same
synchronization cost as a refcount
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