DBLE 新版本 2.18.12.0 Release

本篇文章主要是结合我之前面试的各种经历和实战开发中遇到的问题解决经验整理的，希望这篇《DBLE 新版本 2.18.12.0 Release》对你有很大帮助！欢迎收藏，分享给更多的需要的朋友学习~

1月7日，企业级开源分布式中间件DBLE 新版本 2.18.12.0 发布，本次新版对一些可透传的复杂查询做了优化处理，不再拆分并下发而是直接透传；升级了 druid 的依赖；解决了一些由于解析器不支持的 SQL 支持度问题；修复了大量社区和专业测试团队提交的 issue，多到需要翻页。

dble 新版本 2.18.12.0 发布， 下载地址：
https://github.com/actiontech...
附件包含中文PDF文档，对应online文档地址：
https://actiontech.github.io/...

Features

• Support MySQL Protocol::AuthSwitchRequest #819
• Optimize Query Plan: Some queries can be sent to one datanode in
  fact, no need to rewrite and push down.#752
• Support DDL: create table tbl_name { LIKE old_tbl_name | (LIKE
  old_tbl_name) } #757
• Upgrade Druid from 1.0.31 to 1.1.10 #749
• The log of config error can't tell which property make it #905
• Add manager command of show @@Alert (for bussiness support)

Bug-fixes

• When useJoinStrategy, join with limit and use nest loop in fact, the
  Explain result lost rows #777
• The error log is too simple when dble can not connection to backend
  connection #765
• Complex query got syntax error which caused by string in "group by"
  #779
• Query statements with 2 subqueries can cause thread safty problem
  #917
• Global table union with none global table get unexpect unreadable
  error:ERROR 1105 (HY000): Index: 2, Size: 2 #860
• "order by" can't work fine in sharding table #889
• Unreasonable error message when explain help#899
• Close the session while doing DDL, the DDL lock may not be removed
  #797
• show index from global_table/abc/ may be route to default datanode
  #892
• Reload return detail when Error "other session doing DDL" #900
• “unexpected packet” log in dble.log when execute subquery in dble and
  commit #897 COM_STMT_SEND_LONG_DATA handle error #869
• Inappropriate hints when explain view #837
• Can't support Escape character in prepare statement：prepare stmt from
  'insert into aly_test values(111,111,'test中id为1',111)'; #872
• management cmd "reload @@query_cf" does not work #875
• Can not reflect view under view list after creating the view
  correctly #825
• For .net connector 6.8.8, can't connect to dble with the port 9066
  #878
• It will show wrong table schema and duplicate table names on the
  table list after we click the 'design table' #824
• Dbeaver gui can't display the table list correctly #829
• View will not reflect on the schema list and can't dispay the right
  content after executing the sql 'show create view view_tt;' #827
• Meta data check should ignore AUTO_INCREMENT difference #867
• MySQL Workbench8.0 does not show the global table 'test' #842
• Rollback with hint will send to schema default datanode #533
• dble parses empty column for int to NULL while mysql parses to 0 in
  [load data ...] query #768
• System parameter maxCon is invalid after a connection failure #838
• Error when querying data from mysql table named keys #798
• Error while using the keyword as the view name in the "show create
  view" statement #856
• Insert statements involving multiple nodes will be stored in the slow
  log #807
• Union syntax, select a column twice got error #790
• Add order by for the entire UNION result will get wrong result #791
• [select * from sharding_two_node where id is null] gets lost
  connection ... #800
• Without default database explain failed even referring database at
  table quote #813
• Error when insert contains scheam name in the no_sharding table #836
• [select count(distinct col1,col2) from ... group by col2] get
  different result from mysql Aggregate function #845
• Error when the global table is joined with the non-split table and
  the two tables have a shared node #848
• [select sec_to_time(sum(time_to_sec(t))) from a_manager] get error
  result Aggregate function #814
• [select * from aly_test where id =ALL(select 1);] success but
  explain failed #796
• Function group_concat ([order by ... desc...]), 'order by' and 'desc'
  do not work as same as mysql #820
• Incorrect result on select contains stddev() #844
• Some datanodes cannot be connectted when macCon datanode#822
• Error when insert into sharding column null while it has default null
  value #831
• Insert into sharding column(type timestamp) null while it has default
  not null value will violate sharding expectation #815
• Error,when the join clause contains STR_TO_DATE() and
  conditional_expr is a non-split column #817
• Parses empty line different with mysql in [load data ...] query
  #769
• Incorrect result on show @@connection.sql.EXECUTE_TIME when the
  execution time of query#785
• writeHost in schema.xml should support "weight" #793
• NPE when the data of the insert exceeds the character length in the
  case of opening the slow log #783
• [load data ...] without default database got npe #776
• [create table if not exists test_table(id int)] got error if table
  already exists #784
• Navicat Premium 12 can not connect dble driver #633
• Parser Error when index contains comment #495
• [check full @@metadata] gives global table metadata right while the
  table is not exist in some datanode #786
• Druid can't discriminate between "set session tx_variables,xxx" and
  "set tx_variables,xxx" #316
• SQL parser can not tell the difference of ~id =1 and ~(id =1)#302
• Error when select syntax contains two ignore key(key_name)#413
• Error when create statement contains the option of "algorithm" #258
• Error on index_hint_list which contains multiple index hints #272
• [management-command]JDBC5.1.31 can not connect manager port #680
• Escape character has been lost #295
• [lock table ... write] cannot be parsed by druid #744
• When lower_case_table_names =1, error caused by schema_name case
  sensitive #771
• Query in dble returns "0" while the same query in mysql returns
  "null" #760

先好好读 Release note 原文，近期我们会有重点 issue 的修复解析文章哦，敬请期待！

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