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https://issues.apache.org/jira/browse/DRILL-6642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16651579#comment-16651579
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Vitalii Diravka commented on DRILL-6642:
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Some of the features of Proto2 that are not present in Proto3:
{quote}1. Required message fields. This can be useful for things like SOW keys.
2. Ability to set custom default values for a field.
3. Ability to determine if a missing field was not included, or was assigned
the default value. This is needed for AMPS to use delta messaging.
{quote}
The _required_ message fields are used in some proto files. It is necessary to
investigate how to replace it and whether _optional_ fit there.
"2" should not be the issue. I haven't seen custom default values in Drill.
Not sure about 3, so TBI in the process of updating.
Paul also mentioned in DRILL-5509:
{quote}This will require updating the Maven protobuf plugin, and may require
other upgrades as well.
{quote}
[~priteshm]
If all Proto2 vs Proto3 differences could be addressed the backward
compatibility is preserved.
Looks like the test cases should cover all proto messages in the process of
running _drillbit_ process and different connections to it.
The last issues related to _protobuf_ were displaying operators in Profiles
DRILL-6639, so until Drill UI is automated this part could be verified manually.
> Update protocol-buffers version
> -------------------------------
>
> Key: DRILL-6642
> URL: https://issues.apache.org/jira/browse/DRILL-6642
> Project: Apache Drill
> Issue Type: Task
> Components: Tools, Build & Test
> Affects Versions: 1.14.0
> Reporter: Vitalii Diravka
> Assignee: Vitalii Diravka
> Priority: Major
> Fix For: 1.15.0
>
>
> Currently Drill uses 2.5.0 {{protocol-buffers}} version.
> The last version is 3.6.0 in maven repo:
> [https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java]
> The new version has a lot of useful enhancements, which can be used in Drill.
> One of them is using {{UNRECOGNIZED Enum NullValue}}, which can help to
> handle them in place of null values for {{ProtocolMessageEnum}} - DRILL-6639.
> Looks like the NullValue can be used instead of null returned from
> {{valueOf()}} (_or {{forNumber()}}, since {{valueOf()}} is deprecated in the
> newer protobuf version_):
>
> [https://developers.google.com/protocol-buffers/docs/reference/java/com/google/protobuf/NullValue]
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