FieldDef: Implement generic backfilling logic

The change index has special behavior for recovering field values
from the index. This is used to serve dashboards and change queries
fast and without looking up data in NoteDb or the ChangeNotesCache.

Until now, each index implementation has implemented this backfilling
on its own for all fields. This change is generalizing the logic
to reduce boiler-plate.

Each index implementation now only has to implement an interface that
converts from its specific types to the types defined by FieldDef
(String, Integer, Long, byte[], Timestamp).

This commit adds backfilling logic for modified lines in ChangeData.

Change-Id: I301bc13c6ab5d8f061aeac6a0aaa09ebdf9e9640
10 files changed
tree: dd25bb2a8871aa8a6f7c0e222b169a29733c92c0
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. WORKSPACE
  40. yarn.lock
README.md

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