Changelog
This changelog provides a detailed record of updates and enhancements we have made to improve your Dremio Cloud experience.
March 31, 2026
Lineage nodes now display a Created timestamp.
Fixed an issue where writing an Iceberg table with positional deletes to a REST catalog source could fail when running DELETE, UPDATE, or MERGE DML queries.
Fixed an issue where writing an Iceberg table with deletion vectors to Open Catalog could fail when running DELETE, UPDATE, or MERGE DML queries.
Fixed an issue that prevented users from exchanging External Token Provider (ETP) JWT tokens for Dremio access tokens via the OAuth token exchange grant.
Fixed an issue rendering bar charts with temporal data.
Fixed an issue where visualizations could not be viewed by non-admin users who had permissions on the underlying objects.
Fixed an issue where reading Parquet files with DATA_PAGE_V2 pages marked as uncompressed under a compressed column codec could fail with a decode error.
Fixed an issue where tooltips could display raw HTML.
Fixed an issue where visualizations could show stale data after the underlying view was updated.
Fixed an issue where visualization search results did not return the correct entry.
March 25, 2026
Fixed an issue where the Start new chat button and Clear chat action in the AI agent were not working as expected. Support for Start new chat has been removed at this time and will be reintroduced in a future update.
March 24, 2026
Iceberg v3 Data Types (Preview): Iceberg v3 data types including VARIANT and UUID are now supported in Preview. VARIANT enables flexible storage and querying of semi-structured data like JSON. UUID allows you to read and write universally unique identifiers.
Iceberg v3 Features (Preview):
Row lineage adds row_id and last_updated_sequence_number metadata columns to v3 tables, tracking each row's identity and modification history across updates and compaction. This enables CDC, audit trails, incremental processing, and regulatory compliance.
Iceberg v3 deletion vectors improve performance when updating or deleting data in large tables.
OPTIMIZE TABLE now processes tables in resource-aware batches, preventing out-of-memory errors on large datasets. Multiple runs may be needed for very large tables. Use automatic table maintenance for automatic optimization.
OpenAI-compatible models can be used with Dremio for the AI agent and AI functions.
For users who have permissions to create and alter objects in the catalog, write operations (DML/DDL) are enabled from the agent of your choice via the Dremio MCP Server. The agent will ask for the user to verify and approve the action.
Preview: Google BigLake Iceberg tables can now be queried through the Dremio Iceberg REST Catalog, enabling seamless access to BigLake-managed datasets.
Typing "@" into the Agent chat now allows searching through catalog objects.
The AI agent is available on the Catalog and Jobs page.
SQL blocks in an AI agent chat now have a Run in SQL Runner button to simplify SQL execution.
The AI related project configurations have been moved out of the Preferences page and into a separate AI pages under Admin > Project.
Queries using AI functions with a LIMIT clause now apply the limit before invoking AI functions, improving performance and reducing token usage.
Fixed an issue where jobs were missing end timestamp.
Fixed an issue where Iceberg REST Catalog sources on Azure Data Lake Storage (ADLS) Gen2 failed during query execution.
The namespaces section will now have a max height and is scrollable to allow for easier access of the connections section.
Improve the user experience when adding/deleting namespaces by handling loading states in a smoother manor and adding a go to namespace link with the success notification.
Fixed an issue where the Catalog API returned a 500 error when requesting permissions on the top-level catalog listing.
Fixed a regression where legacy spaces could be created via the Catalog API on projects using Open Catalog.
Fixed an issue where Open Catalog appended /catalog to the base location.
Updated the privileges required to run OPTIMIZE on Open Catalog to SELECT and WRITE.
Fixed an issue where Reflection creation could fail due to validation errors.
Reflection results on Iceberg tables are now consistently up‑to‑date with the latest table snapshot, even with external writers.
Fixed an issue where the LEAST and GREATEST functions returned incorrect results when comparing DECIMAL values with different precision and NULL values.
Improved error messages when running metadata queries (such as table_snapshot or table_history) on views.
Fixed an issue where the Data panel only displayed namespaces instead of all sources.
Removed the "Query Type" column from the SQL Runner's results table.
Updated ChannelClosedException query failure errors to surface the underlying exception that caused the channel to close, i.e. out of memory errors.
Fixed a direct memory leak that occurs in certain scenarios such as query cancellation when the query has a JDBC scan in one of its fragments.
Previously a user didn't see any region selection validation when trying to create a project. Now when they should see a warning under the region selector.
Reduced API response time for Dremio console trial status endpoint.
March 18, 2026
Fixed an issue where folders in Open Catalog could become inaccessible with contents disappearing from view due to an internal error.
February 24, 2026
The AI Agent can now answer questions about upstream sources, downstream dependencies, and how a dataset was created or transformed. The AI Agent can also add a wiki and labels to a dataset.
Lineage information for Iceberg views in Open Catalog is now automatically updated when views are created, modified, or refreshed using ALTER VIEW ... REFRESH METADATA.
In SQL Runner, if a query fails, an Explain button is displayed that uses the AI Agent to provide more information about the error and how to fix it.
Result sets returned by Dremio's AI Agent can now be downloaded as a CSV file.
The Visual Profile now shows information about C3 cache utilization across scan operator threads, helping identify cache configuration issues.
Fixed an issue where S3 connections using an HTTP proxy could ignore the proxy or use an incorrect scheme/port due to proxy SSL configuration handling.
Fixed an issue where Tableau project files downloaded from the Dremio console for Open Catalog datasets contained duplicate catalog names in the path.
Fixed an issue where the total-file-size field in Iceberg table metadata was incorrectly set to zero, which could cause compatibility issues with external tools like Databricks.
Fixed an issue where Redshift sources did not display databases created from datashares.
Fixed an issue where query plans could fail when querying a user-defined function with a Reflection hint.
Fixed an issue where queries on complex data types (structs, lists, unions) using KVGEN and FLATTEN with a WHERE clause could return NULL values.
Fixed an issue where grouping sets with a single column caused the WHERE clause to not apply to NULL values.
Fixed an issue where inserting a NULL element into a list of structs threw an exception.
The Open Catalog page now features an updated layout and branding that highlights Open Catalog powered by Apache Polaris.
The side navigation bar now features labeled menus with expand and collapse functionality.
Column data types now display tooltips in the Open Catalog tree, on metadata cards, and in the Details panel.
You can view and grant project privileges on the Project Settings page in the Dremio console.
Fixed an issue where the lineage graph did not render all parent datasets for public users with SELECT privileges.
February 14, 2026
Fixed an issue where the MCP server and search API returned dataset paths with catalog names included.
Fixed an issue where Tableau and Power BI live connections downloads (.tds and .pbids files) from the Dremio console contained incorrect dataset paths.
February 5, 2026
Fixed an issue where the AI Agent could generate incorrect SQL syntax for function mappings, ILIKE syntax, reserved keyword quoting, and interval/array access patterns.
Fixed a thread-safety issue in the catalog HTTP client that could cause table list retrieval failures during concurrent operations.
Native OAuth applications now support refresh token rotation for improved security.
Fixed an issue where the letter "c" could not be typed in the Create Table from File dialog.
January 27, 2026
Fixed an issue where incorrect files could be deleted when cleaning up old materializations for Reflections.
January 22, 2026
Inactive projects now automatically hibernate after 15 days of inactivity to optimize resource usage and reduce costs.
The AI Agent now supports Mermaid diagrams for visualizing workflows, architectures, and data relationships.
You can now easily create an Iceberg table from a file in object storage with the Create Table from File functionality.
Fixed an issue where multiple LEAD functions partitioned on the same columns could return incorrect results.
Fixed an issue where queries lost the DESC collation when row/column policies were used.
Fixed an issue where created views had extra columns from ORDER BY when ORDER BY expressions were not in the SELECT list.
Fixed an issue where INSERT INTO operations failed with a privilege error.
Fixed an issue where semantic search did not match column names with different capitalization.
January 14, 2026
Fixed an issue where Reflections were incorrectly matched into user queries, producing the wrong results.
December 18, 2025
Dremio Cloud is now available in AWS Europe (Ireland) and Germany (Frankfurt), offering improved performance, lower latency, and enhanced compliance with EU data residency and GDPR requirements.
Creating functions on another project's Open Catalog without navigating to that project first is now properly disallowed.
Setting and unsetting row-filtering and column-masking policies on another project's Open Catalog (added as a source) is now properly disallowed with an improved error message.
Fixed an issue where full refresh Reflections could stop working after repeated refreshes with no data changes.
Reflection refresh job profiles now include a new "Source Table Refresh State" phase that displays tables and other Reflection scans that were planned to build the new materialization.
Fixed an issue that resulted in a truncated file when exporting a query result containing a large number of rows or columns from the Dremio console.
The Catalog API now returns isMetadataExpired and lastMetadataRefreshAt in responses for tables and views.
Fixed an issue where the GET /reflection/recommendations/job-based/{id}/results/ REST API response contained incorrect endpoint URLs.
Fixed an issue where the output rows count was incorrect on the Jobs page for queries accelerated by results cache.
Fixed an issue where the Catalog Usage admin monitor failed to load due to an error processing queries containing a LIST_FILES function call.
When navigating to the SQL Runner, a loading indicator is now shown in the Data Panel.
December 4, 2025
Fixed an issue where the planner threw a "cannot translate call DO_NOT_PUSHDOWN" exception.
Fixed an issue in the vectorized copier where an exception was incorrectly thrown during column vector compaction.
Queries involving evaluation of large numbers of expressions are now more responsive to cancellation.
Fixed an issue where position delete files for Apache Iceberg v2 tables were not being sorted by file_path and pos according to the Iceberg specification.
Fixed an issue where an invalid range error would be thrown when reading a Delta Lake table that used column mapping.
Fixed an issue with validation during the PREPARE statement from the JDBC driver for some DML queries with parameters. Querying complex types with parameters and certain DML queries selected from a subquery with parameters are not supported.
Fixed an issue where SQL queries using tables from the sys source intermittently failed with a "Failure getting source [sys]" error.
Fixed an issue of Dremio process aborting when complex data type columns were involved in hash join queries.
Fixed an issue with runtime filters on DECIMAL columns incorrectly filtering out values.
Fixed an issue where filters on VARBINARY columns could produce inconsistent results.
In the Events tab on the Engines page, the last query time now shows the correct datetime or "--" instead of an invalid date.
Added engine replica numbers to the Engines page for failed events.
Fixed an issue where deleting a namespace you were viewing resulted in a not-found error.
The Maintenance filter in the Attributes dropdown on the Jobs page now appears automatically upon entering the page.
November 20, 2025
Fixed an issue where Iceberg table write operations could create invalid Parquet files when nullability checks were disabled in Dremio, leading to DATA_READ ERROR failures during subsequent queries.
Fixed an issue where sources in a broken state could not be reconfigured.
Reflections are now blocked on JDBC sources (such as Microsoft SQL Server and Oracle) with user impersonation enabled. If user impersonation is enabled after a Reflection is created, users should delete existing Reflections to prevent unauthorized data access, as these Reflections will fail to refresh and expire eventually according to their corresponding policy.
All values in the Attributes filter on the Jobs page now act as OR filters, showing jobs that match any of the selected criteria.
November 12, 2025
Introducing the new Dremio Cloud, featuring the built-in Open Catalog (Powered by Polaris) for seamless data governance and interoperability, Dremio's Query Engine to deliver on fast performance and Dremio's AI Agent so you can discover, analyze, and visualize data using natural language with no SQL expertise required. Try it out with our 30-day free trial by signing up at dremio.com/get-started.