cloud-fan opened a new pull request #28150: [SPARK-31327][SQL][2.4] Write Spark 
version into Avro file metadata
URL: https://github.com/apache/spark/pull/28150
 
 
   Backport 
https://github.com/apache/spark/commit/6b1ca886c0066f4e10534336f3fce64cdebc79a5,
 similar to https://github.com/apache/spark/pull/28142
   
   ### What changes were proposed in this pull request?
   
   Write Spark version into Avro file metadata
   
   ### Why are the changes needed?
   
   The version info is very useful for backward compatibility. This is also 
done in parquet/orc.
   
   ### Does this PR introduce any user-facing change?
   
   no
   
   ### How was this patch tested?
   
   new test

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