perf: add fast MVCC snapshots for MemDb in FlatDb tests#10792

Merged

asdacap merged 13 commits intomasterfrom

treeterm/faster-memdb-snapshot

Mar 26, 2026

Commits on Mar 26, 2026

feat: add MVCC snapshot support to MemDb for fast test snapshots

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chore: migrate FlatDb tests to use SnapshotableMemColumnsDb

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refactor: use primary constructors and optimize write batches

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perf: use ArrayPoolList in MemDbWriteBatch to reduce GC pressure

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refactor: Change SnapshottedMemDb from Dictionary<byte[], Version> to Dictionary<(byte[], int), byte[]>
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fix: Add neverPrune option to SnapshotableMemDb to avoid pruning bug in tests

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fix: Initialize neverPrune before creating column databases

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fix: Critical thread-safety bugs in SnapshotableMemDb

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fix: Remove Reverse() allocations and fix PruneVersionsOlderThan bug

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perf: Switch SnapshotableMemDb from SortedDictionary to SortedSet with GetViewBetween

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perf: Simplify FindFirst/LastKeyAtVersion using GetValueAtVersion

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fix: Address PR review comments on SnapshotableMemDb

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fix: Address PR review - use Lock type and Dictionary instead of IDictionary

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