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https://issues.apache.org/jira/browse/PARQUET-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542280#comment-17542280
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ASF GitHub Bot commented on PARQUET-2069:
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islamismailov commented on PR #957:
URL: https://github.com/apache/parquet-mr/pull/957#issuecomment-1137996922
This is a "list" AND a "map" issue, not just list. If you're using Iceberg,
good news: just apply this PR to your iceberg branch
https://github.com/apache/iceberg/pull/3309
Link to the original issue: https://github.com/apache/iceberg/issues/2962
This worked for us. If you still want to fix it in parquet you might be
interested in this change, or something along those lines (not recommended as I
didn't fully test this change):
commit 1918276ec7f01279cb9906b9378cb8986f6ad3ea
Author: Islam Ismailov <[email protected]>
Date: Wed May 25 19:03:33 2022 +0000
Attempt a fix on avro-parquet conversion
diff --git
a/parquet-avro/src/main/java/org/apache/parquet/avro/AvroSchemaConverter.java
b/parquet-avro/src/main/java/org/apache/parquet/avro/AvroSchemaConverter.java
index 7d1f3cab..960aae22 100644
-
> 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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