Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/21878
Thank you, @gengliangwang and @HyukjinKwon .
For the message, I follow the way to use Apache Spark `external` module;
e.g. we need to specify `kafka` like the following. `avro` is also designed as
`external` module. We should follow that.
```
./bin/spark-shell --packages
org.apache.spark:spark-sql-kafka-0-10_2.11:2.3.1
```
@gengliangwang . I assumed that you are the best person to add `avro`
document. If you need me to do something, please feel free to let me know. :)
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