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https://issues.apache.org/jira/browse/PARQUET-388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292627#comment-15292627
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David Cardon commented on PARQUET-388:
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A workaround I found was to replace all of the {{Message}} references in
[ProtoReadSupport|https://github.com/apache/parquet-mr/blob/master/parquet-protobuf/src/main/java/org/apache/parquet/proto/ProtoReadSupport.java]
with {{MessageOrBuilder}}. You can then fairly easily resolve the {{Builder}}
into a {{Message}} outside of the reading mechanism.
> ProtoRecordConverter might wrongly cast a Message.Builder to Message
> --------------------------------------------------------------------
>
> Key: PARQUET-388
> URL: https://issues.apache.org/jira/browse/PARQUET-388
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Reporter: Wu Xiang
> Assignee: Reuben Kuhnert
>
> ProtoRecordConverter returns current record as follows:
> {code}
> public T getCurrentRecord() {
> if (buildBefore) {
> return (T) this.reusedBuilder.build();
> } else {
> return (T) this.reusedBuilder;
> }
> }
> {code}
> However this might fail if T is subclass of Message and buildBefore == false,
> since it's actually casting a Message.Builder instance to Message type.
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