MariaDB 10.2.0 Alpha 发布

MariaDB 10.2.0 Alpha 发布了。

主要更新内容：

Syntax:

• Window functions have been introduced. This release adds support for a limited set of functions, and the basic execution algorithm. Development continues to expand the set of supported functions and optimize the execution.

• The SHOW CREATE USER statement was introduced.

• New CREATE USER options for limiting resource usage and tls/ssl.

• New ALTER USER statement.

Scripts:

• Continuous binary log backup has been added to mysqlbinlog - MDEV-8713.

• mysql_zap and mysqlbug have been removed - MDEV-7376, MDEV-8654.

Information Schema:

• Added an information schema plugin to report all user variables, which creates the Information Schema USER_VARIABLES Table - MDEV-7331.

Variables:

• aria_recover has been renamed to aria_recover_options - MDEV-8542.

• The server version can now be faked to work around dated applications that require a particular version string - MDEV-7780

EXPLAIN:

• EXPLAIN FORMAT=JSON now shows outer_ref_condition field which contains the condition that the(?) SELECT checks on each re-execution - MDEV-9652.

• EXPLAN FORMAT=JSON now shows sort_key field which shows the sort criteria used by filesort operation. (commit 2078392)

• EXPLAIN used to show incorrect information about how the optimizer resolved ORDER BY clause or Distinct. This is a long-standing problem coming from MySQL. Now, after MDEV-8646 and related fixes, the problem doesn't exist anymore. (For testcases, see MDEV-7982, MDEV-8857, MDEV-7885)

Optimizations:

• Connection setup was made faster by moving creation of THD to new thread (MDEV-6150)

Code:

• "fast mutexes" have been removed. These aren't faster than normal mutexes, and have been disabled by default for years - MDEV-8111.

   

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