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70852: kvserver: QueryResolvedTimestamp should look for intents in LockTable r=shralex a=shralex

Previously, a request called “QueryResolvedTimestamp” that is used to determine the “resolved timestamp” of a key range on a given replica cost O(num_keys_in_span), because it needed to find all intents in the span and intents were interleaved with key-value versions. A multi-release project to separate out intents from MVCC data is now far enough along that we can make this request more efficient by scanning only the lock-table keyspace, reducing its cost to O(num_locks_in_span).

Release note: None

Release justification: This is going into 22.1 where the migration to separated intents is complete

Fixes: #69717

Co-authored-by: Alexander Shraer <alexander@cockroachlabs.com>
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CockroachDB is a cloud-native distributed SQL database designed to build, scale, and manage modern, data-intensive applications.

What is CockroachDB?

CockroachDB is a distributed SQL database built on a transactional and strongly-consistent key-value store. It scales horizontally; survives disk, machine, rack, and even datacenter failures with minimal latency disruption and no manual intervention; supports strongly-consistent ACID transactions; and provides a familiar SQL API for structuring, manipulating, and querying data.

For more details, see our FAQ or architecture document.

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See our online documentation: Quickstart with CockroachCloud

Starting with CockroachDB

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See Also