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https://issues.apache.org/jira/browse/PARQUET-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17103102#comment-17103102
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Priyank Bagrecha commented on PARQUET-1684:
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protobuf introduced experimental presence flag with 3.12.0-rc-1. I tested
parquet-protobuf v1.11.0 with protobuf v3.12.0-rc-1 and this is still an issue.
> [parquet-protobuf] default protobuf field values are stored as nulls
> --------------------------------------------------------------------
>
> Key: PARQUET-1684
> URL: https://issues.apache.org/jira/browse/PARQUET-1684
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Affects Versions: 1.10.0, 1.11.0
> Reporter: George Haddad
> Priority: Major
> Labels: pull-request-available
>
> When the source is a protobuf3 message, and the target file is Parquet, all
> the default values are stored in the output parquet as `{{null`}} instead of
> the actual type's default value.
> For example, if the field is of type `int32`, `double` or `enum` and it
> hasn't been set, the parquet value is `{{null`}} instead of `0`. When the
> field's type is a `string` that hasn't been set, the parquet value is
> {{`null`}} instead of an empty string.
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