[BACKPORT][SPARK-25883][SQL][MINOR] Override method `prettyName` in `from_avro`/`to_avro`#23047

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gengliangwang:backport_avro_pretty_name

Commits on Nov 15, 2018

[SPARK-25883][SQL][MINOR] Override method `prettyName` in `from_avro`/`to_avro`
gengliangwang
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