YDB Topics and Change Data Capture (CDC):

• A new Topic API is introduced in YDB. YDB topic is an entity for storing unstructured messages and delivering them to multiple subscribers.
• A new TopicAPI is supported in YDB CLI and SDK. The API enables topic management operations and streaming message publish/subscribe.
• Added support of table data changes capture into a topic using CDC change feeds.

SDK:

• YDB Topics support added in YDB Golang SDK.
• Official database/sql driver to work with YDB is now supported for Golang.

Embedded UI:

• CDC change feeds and Secondary Indexes are displayed in Database scheme hierarchy as separate objects.
• Visualization of query explain plan was completely redesigned.
• Storage groups with problems are now more visible.
• Various optimizations based on UX assessment

Query Processing:

• Added Query Processor 2.0 — a brand new version of execution engine for OLTP-queries with significant improvements comparing to previous one.
• Improved performance: up to 10% better read throughout, up to 60% better write throughput.
• A feature for NOT NULL constraint for Primary Key has been added. Can be set up at table creation stage only.
• Added support of online secondary index rename without stopping the service.
• Improved query explain representation now includes graph for physical operators.

Core:

• Read-only transactions now use a consistent snapshot that doesn't conflict with concurrent writes.
• Added BulkUpsert support for tables with async secondary indexes.
• Added TTL support for tables with async secondary indexes.
• Added option to compress data during export to S3.
• Added initial version of audit log for DDL statements.
• Added support of authentication with static credentials.
• Added system tables for query performance diagnostics.

Full Changelog: https://github.com/ydb-platform/ydb/compare/22.2.47...22.4.31