internal/postgres: support 3 parallel multi-word searches

Symbol search now supports up to 3 parallel multi-word searches.

For example, previously "bee cmd command" would return 0 results, and
now it returns results for type Command in
github.com/beego/bee/cmd/commands.

A test is also added for the multiWordSearchCombinations function.

For golang/go#44142

Change-Id: I6cc6aa87655576c2d9c13dc90ea18d12d8b19c9c
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/342472
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
2 files changed
tree: 750ac7496cb06f00b042b1fd4fe105c6b3e4a60f
  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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