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MariaDB ColumnStore 1.0.4 Beta Release Notes

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Release date: 27th October 2016

MariaDB ColumnStore 1.0.4 is a beta release of MariaDB ColumnStore. This is the first beta release of MariaDB ColumnStore with improvements over the previous 1.0.3 alpha release.

MariaDB ColumnStore 1.0.4 is an Beta release.

Do not use beta releases on production systems!

For an overview of MariaDB ColumnStore see MariaDB ColumnStore Architectural Overview

Please provide feedback in JIRA for anything that is not working as expected so that we can fix it before we make the release available for the larger community. For general "how to questions" ask questions here or subscribe to mariadb-columnstore@googlegroups.com

Notable Changes

  • MCOL-303 - A build related performance regression in the 1.0.2 release has been fixed restoring performance to be comparable with the prior Infinidb versions.
  • MCOL-251 - MariaDB ColumnStore no longer issues snmp traps.
  • MCOL-325 - the WEEK and YEARWEEK functions are now consistent with the MariaDB server implementation.
  • MCOL-305 - The base MariaDB server version is now 10.1.18.

Bugs and Issues Fixed

Below is list of some of the bugs and issues fixed. A number of regression test and build related fixes were made in addition. For the complete list please see here

  • MCOL-21 - Create table failed due to Error updating BRM block version buffer overflow error
  • MCOL-74 - Nth_value() windowing function does not exist error
  • MCOL-75 - Last_value() Windowing function returned an syntax error
  • MCOL-78 - ROUND() function returns incorrect value
  • MCOL-98 - Behavioral differences between MariaDB and ColumnStore for few functions
  • MCOL-99 - EXTRACT() function returns an exception when processing *MICROSECONDS
  • MCOL-115 - Auto rollback is not occur when update caused a version-buffer-full error (autocommit=1)
  • MCOL-176 - DIV operator crashes PrimProc
  • MCOL-251 - does columnstore need to issue snmp traps?
  • MCOL-285 - Columnstore is few times slower than InfiniDB for DBT3 query #1
  • MCOL-287 - CPImport performance slowdown by 27% or more from a1.0.1 to 1.0.2
  • MCOL-289 - test001 bug2954.sql fails
  • MCOL-290 - decomsrv app reporting incorrect state
  • MCOL-292 - CentOS 7 RPM's don't depend on Boost
  • MCOL-297 - CHARACTER_LENGTH(datetime) returns wrong length
  • MCOL-299 - CHARACTER_LENGTH(float/decimal) returns wrong length
  • MCOL-302 - rpm -U reports errors
  • MCOL-303 - Performance drop between 1.0.1 and 1.0.2
  • MCOL-305 - MariaDB Server 10.1.18 Merge
  • MCOL-308 - Add CMake and RPM build checks for net-snmp
  • MCOL-325 - WEEK() handling needs to match MySQL's
  • MCOL-326 - RAND() behaves differently with negative seeds
  • MCOL-328 - REVERSE() adds extra character
  • MCOL-329 - Functions casting date/datetime 0 to NULL
  • MCOL-330 - Datetime to int conversion returns strange values
  • MCOL-331 - INSERT() function misbehaves with our of range parameters
  • MCOL-332 - MONTHNAME() to int should equal 0
  • MCOL-333 - subtime() off by one second
  • MCOL-335 - Many Window Functions erroniously return 0
  • MCOL-341 - mts_insert_select producing bad results
  • MCOL-343 - ha_calpont_execplan assigns String::ptr() to std::string
  • MCOL-347 - NULLIF datetime compare with date fails

Upgrade

Multi version upgrades are not supported, please upgrade versions prior to 1.0.3 before upgrading to 1.0.4. Details on upgrading from version to 1.0.3 to 1.0.4 can be found here. <TODO>

Upgrade from MariaDB ColumnStore Alpha versions 1.0.0 to 1.0.2 is not supported, please upgrade to version 1.0.3 prior to upgrading to 1.0.4.

Known Issues and Limitations

There are a number bugs and known limitations within this beta version of MariaDB ColumnStore, the most serious of these are listed below. These are expected to be fixed before the GA release.

  • MCOL-37: Following three window functions do not return correct value
    • FIRST_VALUE
    • LEAD
    • LAG
  • MCOL-73): Wide table formatted display causes frontend to return error
    • MariaDB ColumnStore supports wide tables storage
    • Displaying the query results on a large number of columns without formatting the column works
    • Displaying the query results on a large number of columns with formatting causes error at MariaDB Server level
  • MCOL-129 Direct insert of column store reserved values, for example -128 for tinyint in STRICT_ALL_TABLES mode will result in no insert and no warning. Be aware of the range limits for datatypes and avoid using STRICT_ALL_TABLES mode.
  • MCOL-271 empty string values are treated as NULL. This means you cannot insert empty values into a NOT NULL string column.
  • MCOL-334: Subquery using IN with VIEW returns incorrect results. Queries selecting from view and using IN in where clause with a subquery on another view returns incorrect results.
  • MCOL-350: Selects with a where clause of <date-column> = '0000-00-00' do not match. Datetime is not affected.
  • MCOL-364: In a multi UM configuration where the default storage engine has been set to columnstore replicated tables are not created as columnstore tables. Avoid overriding the default storage engine and specify engine=columnstore on all table DDL.
  • MCOL-365: Log files created by load data infile remain in the bulk/data/log and /tmp directories. If storage is a concern these can safely be removed.
  • While Millisecond and Microsecond storage is supported for datetime, time and timestamp columns, at this time the query results cannot return millisecond and microseconds.
  • UTF-8 Limitation
    • UTF-8 must be declared at the table level if the instance has been set up with a UTF-8 profile. Tables created with a non-matching character set will yield indeterminate results.
    • Viewing SQL output should be done using client software that supports UTF-8 character sets.
    • UTF-8 characters are not supported in object names.
  • Known security issues are documented here.

Documentation

MariaDB ColumnStore Documentation

Packaging

RPM and binary packages are provided for the Linux distributions supported by MariaDB ColumnStore 1.0.4 beta version.

  • The supported OS for this Alpha version are CentOS 6, CentOS 7 and Ubuntu 16.0.4.
  • Packages can be downloaded here

Source Code

The source code of MariaDB ColumnStore is tagged at GitHub with a tag, which is identical with the version of MariaDB ColumnStore. For instance, the tag of version X.Y.Z of MariaDB ColumnStore is columnstore-X.Y.Z. Further, master always refers to the latest released non-beta version. Note - Until this beta goes live, the source code tree corresponding to 1.0.4 is the develop branch. Tagging will be done when beta goes live next week.

The source code is available at these locations

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