Null support for protobuf ingestion.

[shenyu0127]

If the protobuf field is NULL, we want to ingest the field as NULL.

• A singular proto3 field can be optional or not. Only an optional singular field can be NULL.
• A repeated proto3 field cannot be NULL, it can be an empty list.

Release-notes

Null support for protobuf ingestion: if the protobuf field is NULL, ingest the field as NULL.

[codecov-commenter]

Codecov Report

Merging #11553 (00fc32a) into master (6208e7c) will decrease coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master   #11553      +/-   ##
============================================
- Coverage     63.05%   63.04%   -0.02%     
+ Complexity     1109     1108       -1     
============================================
  Files          2320     2320              
  Lines        124667   124670       +3     
  Branches      19033    19033              
============================================
- Hits          78614    78601      -13     
- Misses        40458    40472      +14     
- Partials       5595     5597       +2     

Flag	Coverage Δ
integration	<0.01% <0.00%> (ø)
integration1	<0.01% <0.00%> (ø)
integration2	0.00% <0.00%> (ø)
java-11	63.01% <100.00%> (+<0.01%)	⬆️
java-17	62.90% <100.00%> (-0.02%)	⬇️
java-20	62.91% <100.00%> (+0.01%)	⬆️
temurin	63.04% <100.00%> (-0.02%)	⬇️
unittests	63.04% <100.00%> (-0.02%)	⬇️
unittests1	67.45% <ø> (-0.03%)	⬇️
unittests2	14.50% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
.../inputformat/protobuf/ProtoBufRecordExtractor.java	80.43% <100.00%> (+1.78%)	⬆️

... and 12 files with indirect coverage changes

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[xiangfu0]

Please add a release notes section for this.

[shenyu0127]

Please add a release notes section for this.

Done.

[xiangfu0]

Thanks!