Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/16795#discussion_r99944889
--- Diff: sql/core/pom.xml ---
@@ -129,6 +129,19 @@
<artifactId>parquet-avro</artifactId>
<scope>test</scope>
</dependency>
+ <!--
+ This version of avro test-dep is different from the one defined
+ in the parent pom. The parent pom has avro 1.7.7 test-dep for Hadoop.
+ Here, ParquetAvroCompatibilitySuite uses parquet-avro's
AvroParquetWriter
+ which uses avro 1.8.0+ specific API. In Maven 3, we need to have
+ this here to have different versions for the same artifact.
+ -->
--- End diff --
@srowen . This is the added comments.
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