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F grpc null values

Timm Fitschen requested to merge f-grpc-null-values into dev

Summary

Fixes the NullPointerException which was throws when executing SELECT queries on NULL Values, e.g. SELECT p1 FROM ENTITY WHERE p1 IS NULL. The implementation needs to be slightly different compared to SELECT p1 FROM ENTITY WHICH DOESN'T HAVE A p1 but the results must be the same.

Related: #311 (closed)

Focus

Actually there are three fixed bugs in this MR. The fix of the first revealed the second, which revealed the third. See annotations.

Test Environment

No manual testing required.

Check List for the Author

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  • All automated tests pass
  • Reference related issues
  • Up-to-date CHANGELOG.md (or not necessary)
  • Up-to-date JSON schema (or not necessary)
  • Appropriate user and developer documentation (or not necessary)
    • How do I use the software? Assume "stupid" users.
    • How do I develop or debug the software? Assume novice developers.
  • Annotations in code (Gitlab comments)
    • Intent of new code
    • Problems with old code
    • Why this implementation?

Check List for the Reviewer

  • I understand the intent of this MR
  • All automated tests pass
  • Up-to-date CHANGELOG.md (or not necessary)
  • Appropriate user and developer documentation (or not necessary)
  • The test environment setup works and the intended behavior is reproducible in the test environment
  • In-code documentation and comments are up-to-date.
  • Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

Edited by Florian Spreckelsen

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