Update Rust crate heed to 0.22

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
heed	dependencies	minor	0.21 → 0.22

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Release Notes

Kerollmops/heed (heed)

v0.22.1

Compare Source

heed & heed3

This release brings a new functionality: the possibility to create multiple nested read transactions from an uncommitted write transaction. You can also examine another usage in the dedicated example file.

We finally merged the changes to upstream LMDB (mdb.master3), and the patch has been thoroughly reviewed by Howard Chu.

// opening a write transaction
let mut wtxn = env.write_txn()?;

// [use the RwTxn to write into the env]

// opening multiple read-only transactions without committing beforehand
let rtxns = (0..1000).map(|_| env.nested_read_txn(&wtxn)).collect::<heed::Result<Vec<_>>>()?;

// you can also spawn nested read transactions from the write txn too
let rtxns = (0..1000).map(|_| wtxn.nested_read_txn()).collect::<heed::Result<Vec<_>>>()?;

// [use the RoTxns and move them onto different threads]

v0.22.0

Compare Source

heed & heed3

This release brings better-polished support for the heed/heed3 duality. It also improves the documentation, adds support for custom duplicate sort comparators, supports the PREV_SNAPSHOT flag, better support for Thread Local Storage (TLS)-backed of transactions, and bumps LMDB to the latest patch.

What's Changed

• Combined version of LMDB mdb.master and mdb.master3 by @​Kerollmops in meilisearch#278
• Upgrade dependencies by @​Kerollmops in meilisearch#295, meilisearch#304, meilisearch#320, and meilisearch#303
• List the examples in the Cargo tomls by @​Kerollmops in meilisearch#298
• Parametric TLS for read transactions by @​Kerollmops in meilisearch#300
• Fix the MDB_NOTLS documentation by @​Kerollmops in meilisearch#302
• Update license for 2025 by @​meili-bot in meilisearch#305
• Bump LMDB commit, use GitLab for LMDB and improve the build script by @​Kerollmops in meilisearch#310 and meilisearch#311
• Break and improve the Env::copy_to_file method by @​Kerollmops in meilisearch#312
• Introduce the PREV_SNAPSHOT flag by @​irevoire in meilisearch#296
• Rename FIXED_MAP flag name by @​Kerollmops in meilisearch#313
• Expose USE_VALGRIND compilation flag as use-valgrind feature by @​dureuill in meilisearch#288
• Introduce AnyTls by @​dureuill in meilisearch#315
• Show ranges of slice in the doc by @​Kerollmops in meilisearch#318
• More Env parameter accessors by @​Kerollmops in meilisearch#321
• Setting NDEBUG on release builds by @​Kerollmops in meilisearch#324
• Bump -sys crates and heed/heed3 versions by @​Kerollmops in meilisearch#325
• Introduce the Env::copy_to_path method by @​Kerollmops in meilisearch#326
• Make the Env<WithTls> the default by @​Kerollmops in meilisearch#327
• Add Dup Sort Custom Comparator support by @​Kerollmops and @​oXtxNt9U in meilisearch#319

Full Changelog: meilisearch/heed@v0.21.0...v0.22.0

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