tianz101 commented on code in PR #37991:
URL: https://github.com/apache/beam/pull/37991#discussion_r3938243945


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sdks/go/pkg/beam/io/spannerio/CHANGESTREAM.md:
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@@ -0,0 +1,260 @@
+<!--

Review Comment:
   A spanner change stream can be created with 
partition_mode='IMMUTABLE_KEY_RANGE' vs partition_mode = 'MUTABLE_KEY_RANGE'.  
What you are doing here only work for a change stream
   of IMMUTABLE_KEY_RANGE (default) where ChildParititonRecord is returned. 
This is a heads up for
   1) document your connector restriction and 2) structure things so later you 
can expand to MUTABLE_KEY_RANGE mode easily. Thanks. You can look the java sdk 
readChangeStream function to 
   get some ideas on how both modes are supported. Basically in these 2 
different modes, the partition and partition lifecycle are different.



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