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https://issues.apache.org/jira/browse/BEAM-11996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17311843#comment-17311843
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Boyuan Zhang commented on BEAM-11996:
-------------------------------------

h3. Goal
Convert 
[BatchSpannerRead|https://github.com/apache/beam/blob/a16bbf78bb5b3d3a14d13fb39ed442c612d0b493/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/BatchSpannerRead.java#L45]
 into Splittable DoFn. 
Investigate whether it makes sense to convert 
[NaiveSpannerReadFn|https://github.com/apache/beam/blob/243128a8fc52798e1b58b0cf1a271d95ee7aa241/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/NaiveSpannerRead.java#L73]
 into Splittable DoFn as well. 

h3. Details
The Splittable DoFn implementation should be a combination of 
[GeneratePartitionsFn + 
ReadFromPartitionFn|https://github.com/apache/beam/blob/a16bbf78bb5b3d3a14d13fb39ed442c612d0b493/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/BatchSpannerRead.java#L73-L79]

> Implement SpannerIO on top of Splittable DoFn
> ---------------------------------------------
>
>                 Key: BEAM-11996
>                 URL: https://issues.apache.org/jira/browse/BEAM-11996
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-gcp
>            Reporter: Boyuan Zhang
>            Priority: P2
>




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