Version 4.6.0

Released on 2021-07-13.

Note

If you are upgrading a cluster, you must be running CrateDB 4.0.2 or higher before you upgrade to 4.6.0.

We recommend that you upgrade to the latest 4.3 release before moving to 4.6.0.

A rolling upgrade from 4.5.x to 4.6.0 is supported.

Before upgrading, you should back up your data.

Table of Contents

Changes

Performance Improvements

  • Improved the performance of the :ref`hyperloglog_distinct <aggregation-hyperloglog-distinct>` aggregation function.

  • Improved the performance of SELECT statements with WHERE conditions that are in the form of WHERE COL=COL.

  • Improved the performance of INSERT FROM query statements where the query contains a GROUP BY clause.

  • Improved the internal throttling mechanism used for INSERT FROM QUERY and COPY FROM operations. This should lead to these queries utilizing more resources if the cluster can spare them.

  • Added an optimization that improves the performance of count() aggregations on object columns that have at least one inner column with a NOT NULL constraint.

SQL Statements and Compatibility

  • Added the bit(n) data type.

  • CrateDB now accepts the START TRANSACTION statement for PostgreSQL wire protocol compatibility. However, CrateDB does not support transactions and will silently ignore this statement.

  • Added support for directory-level wild card expansion for URIs passed to COPY FROM statements.

New Scalars

  • Added array_to_string scalar function that concatenates array elements into a single string using a separator and an optional null-string.

  • Added array_min and array_max scalar functions returning the minimal and maximal element in array respectively.

  • Added the array_sum scalar function that returns the sum of all elements in an array.

  • Added the array_avg scalar function that returns the average of all elements in an array.

Administration and Operations improvements

  • Users can now read tables within the pg_catalog schema without explicit DQL permission. They will only see records the user has privileges on.

  • Users with AL privileges (or DDL on both tables) can now run the following ALTER CLUSTER commands: ALTER CLUSTER SWAP TABLE source TO target, ALTER CLUSTER REROUTE RETRY FAILED, ALTER CLUSTER GC DANGLING ARTIFACTS.

  • Added support for encrypting node-to-node communication.

  • Changed the privileges model to allow users with DDL privileges on a table to use the OPTIMIZE TABLE statement.

  • Included the shard information for closed tables in sys.shards table.

  • Added a closed column to sys-shards exposing the state of the table associated with the shard.

  • Added support for reading cgroup information in the cgroup v2 format.

  • Added support of hostnames in HBA configuration.

Administration Console

  • Removed all analytics (UDC, Segment)

  • Removed the “Notifications” section in the statusbar

  • Removed min-width for columns in console to reduce scrolling

  • Changed syntax highlighting in console. Keywords in double quotes are now longer highlighted. Types are highlighted with a different color.

  • Activated codemirror code hints for keywords.

  • Changed the look of the Scrollbar to appear more modern.

  • Added length limit for varchar(n) and bit(n) types in table view.

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