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https://issues.apache.org/jira/browse/PARQUET-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519019#comment-17519019
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Timothy Miller commented on PARQUET-2069:
-----------------------------------------
Based on the fact that the option is named "old" list structure, I'm going to
guess that that's been deprecated in favor of a newer array format. That
shouldn't necessarily cause trouble to the user, and it certainly should not
throw an exception. Since I've already started on this, I may at least try to
figure out how to make it not crash.
The exception is thrown as a result of code in
{{AvroRecordConverter.newConverter(Schema schema, Type type, GenericData model,
Class<?> knownClass, ParentValueContainer setter).}} The schema is indicating
that the type is {{{}RECORD{}}}, while the the {{type}} variable indicates that
the type is a string. Gotta figure out how this inconsistency is happening.
> Parquet file containing arrays, written by Parquet-MR, cannot be read again
> by Parquet-MR
> -----------------------------------------------------------------------------------------
>
> Key: PARQUET-2069
> URL: https://issues.apache.org/jira/browse/PARQUET-2069
> Project: Parquet
> Issue Type: Bug
> Components: parquet-avro
> Affects Versions: 1.12.0
> Environment: Windows 10
> Reporter: Devon Kozenieski
> Priority: Blocker
> Attachments: modified.parquet, original.parquet, parquet-diff.png
>
>
> In the attached files, there is one original file, and one written modified
> file that results after reading the original file and writing it back with
> Parquet-MR, with a few values modified. The schema should not be modified,
> since the schema of the input file is used as the schema to write the output
> file. However, the output file has a slightly modified schema that then
> cannot be read back the same way again with Parquet-MR, resulting in the
> exception message: java.lang.ClassCastException: optional binary element
> (STRING) is not a group
> My guess is that the issue lies in the Avro schema conversion.
> The Parquet files attached have some arrays and some nested fields.
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