PravegaKeyValueTable

Build a command to Insert or override a (key,value) pair in a Pravega table:

• if the key does not exist, build a command to insert the value.
• if the key exists, build a command to override.

Upsert a (key,value) pair in a Pravega table.

In case of a conflict:

• the key exists and the version does not match
• the key did not exist at first lookup the ZIO will fail and will be retried.

Build a command to Upsert a (key,value) pair in a Pravega table:

• if the key does not exist, build a command to insert the value.
• if the key exists, build a command to update the value.

The @combine function is used to merge old and new values.