MariaDB ColumnStore 1.5.2 Release Notes

Overview

MariaDB ColumnStore is a columnar storage engine included with MariaDB Enterprise Server. This release of MariaDB ColumnStore is included with MariaDB Community Server 10.5.4.

MariaDB ColumnStore 1.5.2 was released on 2020-06-24. It is the first release in the MariaDB ColumnStore 1.5 series. This release is of Beta maturity, and should not be used with production workloads.

Notable Changes

• Comprehensive rewrite of installation and administration logic. (MCOL-3836)

• Simplified installation:

  • Users no longer need to execute columnstore-post-install and postConfigure

  • It is a plugin for MariaDB Community Server.

  • It is packaged similar to other MariaDB Community Server plugins.

• Simplified administration:

  • mcsadmin has been removed. Instead, ColumnStore 1.5 uses systemd for administration

  • The new systemd service called mariadb-columnstore is used to manage ColumnStore's processes.

• Support for standard MariaDB Community Server collation and character sets. (MCOL-337)

• Improved performance for REGR_* functions. (MCOL-3837)

• Fixes for defects in tiered storage and S3-compatible object storage.

New Features

• Support to set up tempfiles.d to prevent the OS from flushing /tmp on reboot. (MCOL-2101)

• Support for faster replication-slave processing. (MCOL-3835)

• Implements ISTRUE() function. (MCOL-3756)

• Creates a systemd unit file for the MariaDB ColumnStore service. (MCOL-3914)

• Implements MCSNodeControl package. (MCOL-3920)

• Implements REST API server. (MCOL-3921)

• Merges 3 MariaDB ColumnStore packages into a single package. (MCOL-3991)

• Changing systemlang to an unrecognized string now causes MariaDB ColumnStore to not start up. (MCOL-3420)

• Support for ALTER TABLE conversion to MariaDB ColumnStore. (MCOL-3852)

• Support for COLLATE in DDL and ORDER BY clauses. (MCOL-3862)

• Improvements in failover design. (MCOL-3886)

Changed Features

• loadbrm process rewritten in Python (mcs-loadbrm.py). Now requires Python 3 as a dependency.

Issues Fixed

• Fixes IN not evaluating properly in WHERE clauses. (MCOL-2096)

• Fixes DNS error MessageQueueClient :: setup (): unknown name or service - ExeMgr = unassigned (MCOL-2181)

• Fixes FILE001.cdf:No such file or directory error when query, TRUNCATE and cpimport collided. (MCOL-3251)

• Fixes internal error IDB-2035 to BIT_OR() function in projection and subquery. (MCOL-3356)

• Fixes wrong minimum and maximum values after cpimport causing wrong SELECT statement results. (MCOL-3716)

• Fixes truncation during updates causing the Server to assert. (MCOL-3749)

• Fixes RAND() function returning different results in 1.4 compared to 1.2. (MCOL-3760)

• Fixes issue where the same erroneous statement returns a different error other run. (MCOL-3777)

• Fixes GROUP BY ordering error: IDB-2021: 'ref_genome' is not in GROUP BY clause (MCOL-3782)

• Fixes MariaDB asserts when connection is closed. (MCOL-3812)

• Fixes incorrect counts in views. (MCOL-3813)

• Fixes issue in UNION operations about table not being in query. (MCOL-3828)

• Fixes issue where systemctl cat mariadb.service is not working on all systems. (MCOL-3830)

• Optimizes execute() of regr_sxx, regr-sxy, and regr_syy (MCOL-3837)

• Fixes COUNT() as window function not working with NULL values. (MCOL-3839)

• Fixes Server aborting when Columnstore.xml is missing. (MCOL-3853)

• Fixes COUNT() with distinct and 2 columns failing on every other execution. (MCOL-3857)

• Fixes vTpch22.sql hanging. (MCOL-3858)

• Fixes issue where renaming table causes schema to go out of sync. (MCOL-3859)

• Fixes errors raised by every other run of the EXPLAIN statement. (MCOL-3860)

• Fixes fatalHandler usage. (MCOL-3864)

• Fixes intermittent cpimport crashes. (MCOL-3865)

• Fixes bug3333.sql mismatch. (MCOL-3894)

• Fixes fails in Group_concat in ORDER BY with long double (MCOL-3904)

• Fixes error message pointing to wrong function. (MCOL-3924)

• Fixes memory leak in XML parser. (MCOL-3934)

• Fixes IF() function returning incorrect results when using hex constant. (MCOL-3949)

• Fixes microsecond support for FROM_UNIXTIME() function. (MCOL-3959)

• Fixes issue with single INSERT after a LDI in a transaction. (MCOL-4002)

• Fixes issue using $HOME in storagemanager.cnf variable. (MCOL-4014)

• Fixes mishandling of multi-byte characters in DML export to cpimport-1.5. (MCOL-4017)

• Fixes window function issues due to 1.4 returning results where 1.2 returns errors. (MCOL-3856)

• Fixes cpimport S3 multi-PM usage. (MCOL-3861)

Platforms

In alignment to the MariaDB Corporation Engineering Policy, MariaDB Enterprise ColumnStore 1.5.3 is provided for:

• Red Hat Enterprise Linux 8

• Red Hat Enterprise Linux 7

• CentOS 8

• CentOS 7

• Ubuntu 20.04

• Ubuntu 18.04

• Ubuntu 16.04

• Debian 10

• Debian 9

• SUSE Linux Enterprise Server 15

• SUSE Linux Enterprise Server 12

Note: MariaDB Enterprise ColumnStore 1.5 has been superseded by MariaDB Enterprise ColumnStore 5 in MariaDB Enterprise Server 10.5.

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