Release date: July 18, 2024

New Features

• [Preview] Supports temporary tables.
• [Preview] JDBC Catalog supports Oracle and SQL Server.
• [Preview] Unified Catalog supports Kudu.
• Loading data into Primary Key tables with INSERT INTO supports partial updates in column mode.
• User-defined variables support the ARRAY type. #42631
• Stream Load supports converting JSON-type data and loading it into columns of STRUCT/MAP/ARRAY types. #45406
• Supports global dictionary cache.
• Supports deleting partitions in batch. #44744
• Supports queries on Iceberg views. #46273
• Supports managing column-level permissions in Apache Ranger. (Column-level permissions for materialized views and views must be set under the table object.) #47702

Improvements

• Optimized the IdChain hashcode implementation to reduce the FE restart time. #47599
• Improved error messages for the csv.trim_space parameter in the FILES() function, checking for illegal characters and providing reasonable prompts. #44740
• Stream Load supports using \t and \n as row and column delimiters. Users do not need to convert them to their hexadecimal ASCII codes. #47302

Bug Fixes

Fixed the following issues:

• Schema Change failures due to file location changes caused by Tablet migration during the Schema Change process. #45517
• Cross-cluster Data Migration Tool fails to create tables in the target cluster due to control characters such as \, \r in the default values of fields. #47861
• Persistent bRPC failures after BE restarts. #40229
• The user_admin role can change the root password using the ALTER USER command. #47801
• Primary key index write failures cause data write errors. #48045

Behavior Changes

• Intermediate result spilling is enabled by default when sinking data to Hive and Iceberg. #47118
• Changed the default value of the BE configuration item max_cumulative_compaction_num_singleton_deltas to 500. #47621
• When users create a partitioned table without specifying the bucket number, if the number of partitions exceeds 5, the rule for setting the bucket count is changed to max(2*BE or CN count, bucket number calculated based on the largest historical partition data volume). The previous rule was to calculate the bucket number based on the largest historical partition data volume). #47949

Downgrade notes

To downgrade a cluster from v3.3.1 or later to v3.2, users must clean all temporary tables in the cluster by following these steps:

1. Disallow users to create new temporary tables:

   ADMIN SET FRONTEND CONFIG("enable_experimental_temporary_table"="false"); 
   

2. Check if there are any temporary tables in the cluster:

   SELECT * FROM information_schema.temp_tables;
   

3. If there are temporary tables in the system, clean them up using the following command (the SYSTEM-level OPERATE privilege is required):

   CLEAN TEMPORARY TABLE ON SESSION 'session';