migrations: add column search_documents.ln_imported_by_count

Column search_documents.ln_imported_by_count is added, since both symbol
and package search use that value for computing scores.

At the moment, symbol search uses
symbol_search_documents.ln_imported_by_count (which can be dropped after
this column is populated), and package search computes the value for
each result during search. Instead, this column can be used.

trigger_modify_ln_imported_by_count is used to set the value of
ln_imported_by_count every time imported_by_count is upserted.

For golang/go#44142

Change-Id: Icce55811e0c5fce5e5607787aaf11cb3bf65b818
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/347989
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
2 files changed
tree: 88d6e48a2b5b19613930ba230108dbd670c350b1
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

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