claudevdm commented on code in PR #34348:
URL: https://github.com/apache/beam/pull/34348#discussion_r2014764448
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sdks/go/pkg/beam/runners/prism/internal/urns/urns.go:
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@@ -124,6 +124,7 @@ var (
CoderTimer = cdrUrn(pipepb.StandardCoders_TIMER)
CoderKV = cdrUrn(pipepb.StandardCoders_KV)
+ CoderTuple = "beam:coder:tuple:v1"
Review Comment:
> The actual shuffle needs KVs
What do you mean by this? The way I understand it is
- Reshuffle adds random keys (k, v)
- ReifyMetadata maintains a kv, with a nested tuple as a value (value,
timestamp, pane_info)
https://github.com/apache/beam/blob/db0aa824461610463df455fee69ca52b0b8ba3f4/sdks/python/apache_beam/transforms/util.py#L966
I guess if we want to avoid this we can have a nested kv in ReifyMetedata so
it is
- key, (value, (timestamp, pane_info))
Then the regular kv coder should work?
The original reify just used a kv as the value in the reify function
https://github.com/apache/beam/blob/57d1c35aaf7fadc62e69ddf72e95af803d92b1c3/sdks/python/apache_beam/transforms/util.py#L972
We are now including pane info as mentioned above so it becomes a tuple
This only happens for global window case, in the custom window case the
value for reify is a windowed value
https://github.com/apache/beam/blob/57d1c35aaf7fadc62e69ddf72e95af803d92b1c3/sdks/python/apache_beam/transforms/util.py#L996
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