1月7日，企業級開源分佈式中間件DBLE 新版本 2.18.12.0 發佈，本次新版對一些可透傳的複雜查詢做了優化處理，不再拆分並下發而是直接透傳；升級了 druid 的依賴；解決了一些由於解析器不支持的 SQL 支持度問題；修復了大量社區和專業測試團隊提交的 issue，多到需要翻頁。
dble 新版本 2.18.12.0 發佈， 下載地址：
https://github.com/actiontech/dble/releases
附件包含中文PDF文檔，對應online文檔地址：
https://actiontech.github.io/dble-docs-cn/
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爲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
先好好讀 Release note 原文，近期我們會有重點 issue 的修復解析文章哦，敬請期待！
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