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Posted to issues@spark.apache.org by "Gengliang Wang (Jira)" <ji...@apache.org> on 2020/05/08 20:37:00 UTC
[jira] [Commented] (SPARK-30267) avro deserializer: ArrayList
cannot be cast to GenericData$Array
[ https://issues.apache.org/jira/browse/SPARK-30267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17102919#comment-17102919 ]
Gengliang Wang commented on SPARK-30267:
----------------------------------------
Hi [~tashoyan],
could you provide a simple reproduce step?
> avro deserializer: ArrayList cannot be cast to GenericData$Array
> ----------------------------------------------------------------
>
> Key: SPARK-30267
> URL: https://issues.apache.org/jira/browse/SPARK-30267
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.4
> Reporter: Steven Aerts
> Assignee: Steven Aerts
> Priority: Major
> Fix For: 3.0.0
>
>
> On some more complex avro objects, the Avro Deserializer fails with the following stack trace:
> {code}
> java.lang.ClassCastException: java.util.ArrayList cannot be cast to org.apache.avro.generic.GenericData$Array
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$newWriter$19(AvroDeserializer.scala:170)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$newWriter$19$adapted(AvroDeserializer.scala:169)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$1(AvroDeserializer.scala:314)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$1$adapted(AvroDeserializer.scala:310)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$2(AvroDeserializer.scala:332)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$getRecordWriter$2$adapted(AvroDeserializer.scala:329)
> at org.apache.spark.sql.avro.AvroDeserializer.$anonfun$converter$3(AvroDeserializer.scala:56)
> at org.apache.spark.sql.avro.AvroDeserializer.deserialize(AvroDeserializer.scala:70)
> {code}
> This is because the Deserializer assumes that an array is always of the very specific {{org.apache.avro.generic.GenericData$Array}} which is not always the case.
> Making it a normal list works.
> A github PR is coming up to fix this.
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