[rust] Support KvScan in Rust client - #4201
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…dling - Add KvBatchScanner with ScanKv RPC continuation protocol for paginated full-bucket scans with snapshot isolation - Add scanner error handling for TooManyScanners, NotLeaderOrFollower, ScannerExpired and UnknownScannerId with retry/backoff - Add config options for KV scan batch size - Add FlussApiError variants for scanner-related errors - Update C++ and Elixir bindings to reflect new APIs - Add integration tests for batch scanner scenarios
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Purpose
Linked issue: close #3294
This PR adds KvScan support to the Rust client, bringing it in line with the existing server-side and Java client semantics. It allows users to scan the merged current state of a primary-key table, instead of consuming its changelog.
Brief change log
ScanKvlifecycle, including continuation requests, timeout-safe polling, resource cleanup, and error handling.Tests
API and Format
This PR adds the following public Rust APIs:
TableScan::create_bucket_kv_scannerTableScan::create_kv_scannerKvBatchScannerKvSnapshotScannerKvBatchReadOutcomeConfig::scanner_kv_fetch_max_bytesNo storage format or RPC protocol changes are introduced. The implementation uses the existing
ScanKvRPC and KV value record format.Documentation
Updated the Rust API reference and primary-key table guide with full KV scan configuration, semantics, limitations, and examples.