benWize commented on pull request #15493:
URL: https://github.com/apache/beam/pull/15493#issuecomment-917095479


   @ajamato Would you help me to review the progress on this? It is still 
pending to add `queryName` as label metrics, but I want to ask your opinion 
about it. 
   I added `queryName` to `ReadOperation` Builder
   
https://github.com/apache/beam/blob/63c07230d50eb7335a2518fcda712fccc4646278/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/ReadOperation.java#L99
   but at this point the `ReadOperation` is not accessible, only `Transaction` 
https://github.com/apache/beam/blob/63c07230d50eb7335a2518fcda712fccc4646278/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/BatchSpannerRead.java#L161
   My suggested approach is to add queryName to `CreateTransaction` Builder so 
I can extract queryName inside `ReadFromPartitionFn` process method 
https://github.com/apache/beam/blob/63c07230d50eb7335a2518fcda712fccc4646278/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerIO.java#L753
 
   


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