v25.8 Changelog for Cloud

- [Backward incompatible changes](#backward-incompatible-changes)
  - [JSON and data format changes](#json-and-data-format-changes)- [Storage and partitioning](#storage-and-partitioning)- [Function enhancements](#function-enhancements)- [Data type improvements](#data-type-improvements)- [Performance and resource management](#performance-and-resource-management)- [Schema and SQL syntax](#schema-and-sql-syntax)- [Security and permissions](#security-and-permissions)- [New features](#new-feature)
    - [Data types](#data-types)- [Functions](#functions)- [System tables](#system-tables)- [Iceberg and DeltaLake](#iceberg-and-deltalake)- [MergeTree and storage](#mergetree-and-storage)- [Protocol and client Support](#protocol-and-client-support)- [SQL and query features](#sql-and-query-features)- [Formats](#formats)- [Server configuration and workload management](#server-configuration-and-workload-management)- [Cloud storage](#cloud-storage)- [Keeper](#keeper)- [Experimental features](#experimental-features)
      - [Table engines and table functions](#table-engines-and-table-functions)- [Text index improvements](#text-index-improvements)- [Feature maturity updates](#feature-maturity-updates)- [Performance improvements](#performance-improvements)
        - [Query execution and aggregation](#query-execution-and-aggregation)- [JOIN optimizations](#join-optimizations)- [Distributed query improvements](#distributed-query-improvements)- [Index improvements](#index-improvements)- [Subquery optimizations](#subquery-optimizations)- [Azure Blob Storage improvements](#azure-blob-storage-improvements)- [Storage engine improvements](#storage-engine-improvements)- [Format improvements](#format-improvements)- [Data type and serialization optimizations](#data-type-and-serialization-optimizations)- [Pipeline and execution improvements](#pipeline-and-execution-improvements)- [Memory and resource optimizations](#memory-and-resource-optimizations)- [Query planning and analysis](#query-planning-and-analysis)- [Logging improvements](#logging-improvements)- [Function optimizations](#function-optimizations)- [Keeper improvements](#keeper-improvements)- [Data lake improvements](#data-lake-improvements)- [Improvements](#improvements)
          - [Access control and security](#access-control-and-security)- [Backup and restore](#backup-and-restore)- [Data integrity and validation](#data-integrity-and-validation)- [Iceberg table engine](#iceberg-table-engine)- [DeltaLake table engine](#deltalake-table-engine)- [Data lake integration](#data-lake-integration)- [S3 and object storage](#s3-and-object-storage)- [S3Queue table engine](#s3queue-table-engine)- [Kafka integration](#kafka-integration)- [ClickHouse Keeper improvements](#clickhouse-keeper-improvements)- [JSON and Dynamic types](#json-and-dynamic-types)- [Parquet and ORC formats](#parquet-and-orc-formats)- [Distributed queries and parallel replicas](#distributed-queries-and-parallel-replicas)- [Settings and configuration](#settings-and-configuration)- [System tables and observability](#system-tables-and-observability)- [Database engines](#database-engines)- [System and internal improvements](#system-and-internal-improvements)- [Replication and synchronization](#replication-and-synchronization)- [SystemAndInternalImprovements](#systemandinternalimprovements)- [Functions and expressions](#functions-and-expressions)- [MergeTree improvements](#mergetree-improvements)- [Cache and memory management](#cache-and-memory-management)- [Vector similarity index](#vector-similarity-index)- [Error handling and messages](#error-handling-and-messages)- [SQL formatting improvements](#sql-formatting-improvements)- [External integrations](#external-integrations)- [Miscellaneous improvements](#miscellaneous-improvements)- [Performance optimizations](#performance-optimizations)- [Query execution fixes](#query-execution-fixes)- [Iceberg and DataLake fixes](#iceberg-and-datalake-fixes)- [DeltaLake fixes](#deltalake-fixes)- [TTL and MergeTree fixes](#ttl-and-mergetree-fixes)- [Projection fixes](#projection-fixes)- [Parallel replicas fixes](#parallel-replicas-fixes)- [Authentication and security](#authentication-and-security)- [Backup and restore fixes](#backup-and-restore-fixes)- [Window and aggregate functions](#window-and-aggregate-functions)- [Parquet and file format fixes](#parquet-and-file-format-fixes)- [Join fixes](#join-fixes)- [Replicated database fixes](#replicated-database-fixes)- [Lightweight updates fixes](#lightweight-updates-fixes)- [S3 and object storage fixes](#s3-and-object-storage-fixes)- [DynamicAndVariantTypeFixes](#dynamicandvarianttypefixes)- [Keeper fixes](#keeper-fixes)- [Indexing fixes](#indexing-fixes)- [Materialized view fixes](#materialized-view-fixes)- [Azure and cloud storage fixes](#azure-and-cloud-storage-fixes)- [Crash and stability fixes](#crash-and-stability-fixes)- [Glue and catalog fixes](#glue-and-catalog-fixes)- [Function fixes](#function-fixes)- [Distributed query fixes](#distributed-query-fixes)- [Metrics and monitoring fixes](#metrics-and-monitoring-fixes)- [Data type and conversion fixes](#data-type-and-conversion-fixes)- [Memory and resource management](#memory-and-resource-management)- [Configuration and settings fixes](#configuration-and-settings-fixes)- [MongoDB fixes](#mongodb-fixes)- [Miscellaneous fixes](#miscellaneous-fixes)

Was this page helpful?