internal/postgres: use series path in sort by latest

Using module path when sorting by the latest version can give the
wrong answer for some paths. Consider M/v9 and M/v10.  The latter is
obviously later, but sorting by module path descending before version
returns M/v9. But sometimes we do want to sort by the module path
first, as when we prefer an older version in a nested module to a
newer version outside. (See
TestGetUnitMeta/prefer_pubsublite_nested_module.)

If we sort by series path instead of module path handles both cases.
When looking for the latest major version of a given module, we select
for the series path, so sorting by series path is a no-op.  But the
series path correctly distinguishes nested modules from their parent
modules.

Fixes golang/go#43902

Change-Id: Icadab4ce2326f91ab3d3c81f46d17e482a2b9654
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/286452
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
2 files changed
tree: bfa1cacc75d31aba1d7e02e588cb5c1e8f3c9748
  1. cmd/
  2. content/
  3. devtools/
  4. doc/
  5. e2e/
  6. internal/
  7. migrations/
  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. LICENSE
  23. package-lock.json
  24. package.json
  25. PATENTS
  26. README.md
  27. tsconfig.json
README.md

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