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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 <= the number of 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<1ms #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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