damccorm opened a new pull request, #22897:
URL: https://github.com/apache/beam/pull/22897
This continues to grow our state support by adding map state support. Once
this is in, I'll add a follow up PR with an integration test. In the meantime,
I tested manually by running the hacked wordcount found here - - and it
produced output like:
```
any, 1. Total num keys: 2. With keys: [any5 any]
any, 2. Total num keys: 3. With keys: [any7 any5 any]
any, 3. Total num keys: 4. With keys: [any28 any7 any5 any]
any, 4. Total num keys: 5. With keys: [any28 any7 any5 any any13]
any, 5. Total num keys: 6. First 5 keys: [any28 any7 any5 any any13]
any, 6. Total num keys: 7. First 5 keys: [any28 any7 any5 any any13]
any, 7. Total num keys: 8. First 5 keys: [any28 any5 any13 any97 any98]
any, 8. Total num keys: 9. First 5 keys: [any28 any5 any13 any97 any98]
any, 9. Total num keys: 10. First 5 keys: [any28 any5 any13 any97 any98]
any, 10. Total num keys: 11. First 5 keys: [any28 any5 any13 any97 any98]
any, 11. Total num keys: 12. First 5 keys: [any28 any5 any13 any97 any98]
any, 12. Total num keys: 13. First 5 keys: [any28 any5 any13 any97 any98]
any, 13. Total num keys: 14. First 5 keys: [any28 any5 any13 any97 any98]
any, 14. Total num keys: 14. First 5 keys: [any28 any5 any13 any97 any98]
any, 15. Total num keys: 15. First 5 keys: [any33 any8 any28 any5 any6]
any, 16. Total num keys: 16. First 5 keys: [any33 any8 any28 any5 any6]
any, 17. Total num keys: 17. First 5 keys: [any33 any9 any8 any28 any5]
any, 18. Total num keys: 18. First 5 keys: [any33 any9 any8 any28 any5]
Camelot, 1. Total num keys: 2. With keys: [Camelot Camelot17]
Mean, 1. Total num keys: 2. With keys: [Mean87 Mean]
Reverbs, 1. Total num keys: 2. With keys: [Reverbs Reverbs73]
devour, 1. Total num keys: 2. With keys: [devour devour26]
vengeance, 1. Total num keys: 2. With keys: [vengeance vengeance6]
vengeance, 2. Total num keys: 3. With keys: [vengeance72 vengeance
vengeance6]
vengeance, 3. Total num keys: 4. With keys: [vengeance64 vengeance6
vengeance72 vengeance]
...
```
Note that this doesn't add support for Remove (to remove a single key). This
will come in a future pr and has been noted in #22736
Part of #22736
------------------------
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