### Description
Adding branch support for RemoteTable by threading a branch selector
onto every operation the data plane accepts it on. Exposes the
currentBranch to nodejs and python through the bindings.
Matching the server handlers, the branch rides as:
- a `?branch=` query parameter for Arrow-body and query-only ops
(insert, merge_insert, multipart_*, version/list, drop_index)
- a `branch` field in the JSON body for everything else (count_rows,
query, update, delete, create_index, column ops, index list/stats,
stats, restore, describe, tags create/update)
A main-branch handle (`branch == None`) produces byte-identical requests
to before: no `branch` field and no `?branch=`
- Handle-per-branch: `create_branch` / `checkout_branch` return a new
handle with fresh caches and reset version/freshness state, mirroring
`NativeTable`.
- `create_branch` maps 409 to already-exists, 400 to invalid, and 404 to
not-found with source context, and sends without retry so the 409 stays
observable.
- `Ref` translation covers version, version-number (relative to the
handle's branch), and tag (resolved via the tags endpoint); `"main"` and
empty normalize to the main branch.
- Python branch handles persist their branch (and pinned version) across
pickle/fork, so a forked or pickled handle reopens on its branch rather
than silently reverting to main.
### Tests
- Rust mock tests per op category (query-param and body mechanisms,
branch CRUD, error paths, backward-compat).
- Python sync branch CRUD, `open_table(branch=)`, and a pickle
round-trip regression test.
### Description
Stacked on #3490. Adds an optional version to branch checkout across the
Rust core and the Python and TypeScript SDKs, so you can open a specific
version on a branch ("version V of branch B"), not just the branch's
latest version
Rust
```rust
// Open version 3 of branch "exp" (a read-only view): check out from an
// existing table, or open it directly from the connection.
let exp_v3 = table.checkout_branch("exp", Some(3)).await?;
let exp_v3 = db.open_table("items").branch("exp").version(3).execute().await?;
// checkout_latest re-attaches to the branch's writable HEAD.
exp_v3.checkout_latest().await?;
// With no branch, a version opens main at that version.
let main_v3 = db.open_table("items").version(3).execute().await?;
```
Python
```python
# Open version 3 of branch "exp" (a read-only view): check out from an
# existing table, or open it directly from the connection.
branch_v3 = await table.branches.checkout("exp", version=3)
branch_v3 = await db.open_table("items", branch="exp", version=3)
# checkout_latest re-attaches to the branch's writable HEAD.
await branch_v3.checkout_latest()
# With no branch, a version opens main at that version.
main_v3 = await db.open_table("items", version=3)
```
TypeScript
```typescript
// Open version 3 of branch "exp" (a read-only view): check out from an
// existing table, or open it directly from the connection.
const branchV3 = await (await table.branches()).checkout("exp", 3);
const opened = await db.openTable("items", undefined, { branch: "exp", version: 3 });
// checkoutLatest re-attaches to the branch's writable HEAD.
await branchV3.checkoutLatest();
// With no branch, a version opens main at that version.
const mainV3 = await db.openTable("items", undefined, { version: 3 });
```
### Testing
- Added unit tests (Rust, Python sync + async, TypeScript):
branch-scoped resolution at a version number shared with `main` and with
another branch, read-only enforcement on a pinned handle,
`checkout_latest` recovery to the branch's HEAD, fork-point reads, and
the nonexistent-version/branch error paths.
- Ran smoke tests against the Python and TypeScript SDKs on local
machine.
## Summary
This PR introduces a `HeaderProvider` which is called for all remote
HTTP calls to get the latest headers to inject. This is useful for
features like adding the latest auth tokens where the header provider
can auto-refresh tokens internally and each request always set the
refreshed token.
---------
Co-authored-by: Claude <noreply@anthropic.com>
This PR adds mTLS (mutual TLS) configuration support for the LanceDB
remote HTTP client, allowing users to authenticate with client
certificates and configure custom CA certificates for server
verification.
---------
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Adds an overall `timeout` parameter to `TimeoutConfig` that limits the
total time for the entire request
- Can be set via config or `LANCE_CLIENT_TIMEOUT` environment variable
- Exposed in Python and Node.js bindings
- Includes comprehensive tests
## Test plan
- [x] Unit tests for Rust TimeoutConfig
- [x] Integration tests for Python bindings
- [x] Integration tests for Node.js bindings
- [x] All existing tests pass
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-authored-by: Claude <noreply@anthropic.com>
Closes#1106
Unfortunately, these need to be set at the connection level. I
investigated whether if we let users provide a callback they could use
`AsyncLocalStorage` to access their context. However, it doesn't seem
like NAPI supports this right now. I filed an issue:
https://github.com/napi-rs/napi-rs/issues/2456
This exposes the `LANCEDB_LOG` environment variable in node, so that
users can now turn on logging.
In addition, fixes a bug where only the top-level error from Rust was
being shown. This PR makes sure the full error chain is included in the
error message. In the future, will improve this so the error chain is
set on the [cause](https://nodejs.org/api/errors.html#errorcause)
property of JS errors https://github.com/lancedb/lancedb/issues/1779Fixes#1774
