[SPARK-42406][SQL] Fix check for missing required fields of to_protobuf#40080

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rangadi wants to merge 3 commits intoapache:masterfrom

rangadi:fix-required-field-check

Commits on Feb 19, 2023

Fix check for required fields.
Raghu Angadi
committed

Commits on Feb 21, 2023

Try fix for scala style
Raghu Angadi
committed
Add a test to verify optional field can be missing in input schema
Raghu Angadi
committed