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https://issues.apache.org/jira/browse/PARQUET-388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127838#comment-15127838
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Matt Martin commented on PARQUET-388:
-------------------------------------
I agree with [~wxiang7] that there seems to be something a little bit off here.
I'm also getting an unexpected ClassCastException in the following Scala code:
{code}
val reader = ParquetReader.builder(new ProtoReadSupport[SomeMessageClass](),
new Path(file.toURI)).build
...
reader.read
{code}
At reader.read I get the following exception:
{code}
ClassCastException: : SomeMessageClass$Builder cannot be cast to
SomeMessageClass
{code}
I cannot change the declaration of reader to the following:
{code}
val reader = ParquetReader.builder(new
ProtoReadSupport[SomeMessageClass$Builder](), new Path(file.toURI)).build
{code}
because then I get the following error:
{code}
type arguments [SomeMessageClass$Builder] do not conform to class
ProtoReadSupport's type parameter bounds [T <: com.google.protobuf.Message]
{code}
> 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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