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https://issues.apache.org/jira/browse/PARQUET-1917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17205673#comment-17205673
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ASF GitHub Bot commented on PARQUET-1917:
-----------------------------------------
dossett opened a new pull request #820:
URL: https://github.com/apache/parquet-mr/pull/820
https://issues.apache.org/jira/browse/PARQUET-1917
### Jira
- [X] My PR addresses the following [Parquet
Jira](https://issues.apache.org/jira/browse/PARQUET-1917/) issues and
references them in the PR title.
### Tests
- [X] My PR adds the following unit tests __OR__ does not need testing for
this extremely good reason:
### Commits
- [X] My commits all reference Jira issues in their subject lines. In
addition, my commits follow the guidelines from "[How to write a good git
commit message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
1. Subject is limited to 50 characters (not including Jira issue reference)
1. Subject does not end with a period
1. Subject uses the imperative mood ("add", not "adding")
1. Body wraps at 72 characters
1. Body explains "what" and "why", not "how"
### Documentation
- [X] In case of new functionality, my PR adds documentation that describes
how to use it.
- All the public functions and the classes in the PR contain Javadoc that
explain what it does
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> [parquet-proto] default values are stored in oneOf fields that aren't set
> -------------------------------------------------------------------------
>
> Key: PARQUET-1917
> URL: https://issues.apache.org/jira/browse/PARQUET-1917
> Project: Parquet
> Issue Type: Bug
> Affects Versions: 1.12.0
> Reporter: Aaron Blake Niskode-Dossett
> Priority: Major
>
> SCHEMA
> --------
> {noformat}
> message Person {
> int32 foo = 1;
> oneof optional_bar {
> int32 bar_int = 200;
> int32 bar_int2 = 201;
> string bar_string = 300;
> }
> }{noformat}
>
> CODE
> --------
> I set values for foo and bar_string
>
> {noformat}
> for (int i = 0; i < 3; i += 1) {
> com.etsy.grpcparquet.Person message = Person.newBuilder()
> .setFoo(i)
> .setBarString("hello world")
> .build();
> message.writeDelimitedTo(out);
> }{noformat}
> And then I write the protobuf file out to parquet.
>
> RESULT
> -----------
> {noformat}
> $ parquet-tools show example.parquet
>
> +-------+-----------+------------+--------------+
> | foo | bar_int | bar_int2 | bar_string |
> |-------+-----------+------------+--------------|
> | 0 | 0 | 0 | hello world |
> | 1 | 0 | 0 | hello world |
> | 2 | 0 | 0 | hello world |
> +-------+-----------+------------+--------------+{noformat}
>
> bar_int and bar_int2 should be EMPTY for all three rows since only bar_string
> is set in the oneof. 0 is the default value for int, but it should not be
> stored.
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