bkietz commented on code in PR #36418:
URL: https://github.com/apache/arrow/pull/36418#discussion_r1254597681
##########
cpp/src/arrow/array/array_dict.cc:
##########
@@ -106,8 +106,9 @@ DictionaryArray::DictionaryArray(const
std::shared_ptr<DataType>& type,
SetData(data);
}
-std::shared_ptr<Array> DictionaryArray::dictionary() const {
+const std::shared_ptr<Array>& DictionaryArray::dictionary() const {
if (!dictionary_) {
+ // FIXME this isn't thread safe
Review Comment:
Follow up filed here https://github.com/apache/arrow/issues/36503
will update the comment to
```suggestion
// TODO(GH-36503) this isn't thread safe
```
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