Avoid returning bare lists for iterables in CombineFn.merge_accumulators
Open
core
new feature
P3
python
- Dominant language
- Java
- Stars
- 8.7k
- Forks
- 4.7k
- Avg merge
- 1d 20h
- Merged PRs (30d)
- 196
Description
The only contract here is that what is returned here is an iterable. We should avoid returning a more concrete class to better set expectations when running on distributed runners.
Imported from Jira [BEAM-11882](https://issues.apache.org/jira/browse/BEAM-11882). Original Jira may contain additional context.
Reported by: robertwb.
Contributor guide
Assessment
This issue has not been assessed yet.