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`DefaultMaxInSize` is an internal parameter for limiting the size of `field IN (...)` clauses in DB queries, which is a reasonable thing to do -- in addition to the errors noted when [originally introduced](https://github.com/go-gitea/gitea/pull/4594), there are technical limits that apply to each of PostgreSQL, MySQL, and SQLite which would prevent an unbounded size for a query like this. However: the size is incredibly small at 50, and, the implementation of `DefaultMaxInSize` is really wasteful with copy-and-paste coding. This PR: - introduces `GetByIDs` which fetches a `map[int64]*Model` from the database for an array of ID values, while respecting `IN` clause size limits - introduces `GetByFieldIn` which fetches a `map[int64][]*Model` from the database for an array of field values, while respecting `IN` clause size limits - uses `slices.Chunk` for other locations where queries are too complex for these implementations - bumps the `DefaultMaxInSize` parameter from 50 to 500, a conservative increase well under known limits, but 10x the current value: - PostgreSQL supports up to 1GB query text size with 65,535 parameters, but I've experienced performance degradation at high value counts - MySQL supports 64MB query text size without known limits of parameter count - SQLite supports 32,766 parameters in a query ## Checklist The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. All work and communication must conform to Forgejo's [AI Agreement](https://codeberg.org/forgejo/governance/src/branch/main/AIAgreement.md). There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org). ### Tests for Go changes - I added test coverage for Go changes... - [x] in their respective `*_test.go` for unit tests. - Refactored functions are assumed to be covered by existing tests to some extent; that assumption is probably wrong but the changes here are relatively easily reviewed for correctness as well. - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server. - I ran... - [x] `make pr-go` before pushing ### Documentation - [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change. - [x] I did not document these changes and I do not expect someone else to do it. ### Release notes - [ ] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change. - [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change. Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11999 Reviewed-by: Andreas Ahlenstorf <aahlenst@noreply.codeberg.org> Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net> Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net> |
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