Release Note 2.0.8

[xiaokang]

Previous Release Note 2.0.7

Thanks to our community users and developers, about 65 improvements and bug fixes have been made in Doris 2.0.8 version.

1 Behavior change

• The ADMIN SHOW statement can not be executed with high version of mysql 8.x jdbc driver. So rename these statement, remove the ADMIN keywords.
  • [Refactor](admin-stmt) rename some admin-show statestmt #29492

ADMIN SHOW CONFIG -> SHOW CONFIG
ADMIN SHOW REPLICA -> SHOW REPLICA
ADMIN DIAGNOSE TABLET -> SHOW TABLET DIAGNOSIS
ADMIN SHOW TABLET -> SHOW TABLET

2 New features

N/A

3 Improvement and optimizations

• make inverted index work with topn opt in Nereids
• Limit the max string length to 1024 while collecting column stats to control BE memory usage
• jdbc catalog close when jdbc client is not empty
• Accept all iceberg database and do not check the name format of database
• Refresh external table's rowcount async to avoid cache miss and unstable query plan
• Simplify the isSplitable method of hive external table to avoid too many hadoop metrics

See the complete list of improvements and bug fixes on github .

Big Thanks

Thanks all who contribute to this release:

@924060929
@AcKing-Sam
@amorynan
@AshinGau
@BePPPower
@BiteTheDDDDt
@ByteYue
@cambyzju
@dongsilun
@eldenmoon
@feiniaofeiafei
@gnehil
@Jibing-Li
@liaoxin01
@luwei16
@morningman
@morrySnow
@mrhhsg
@Mryange
@nextdreamblue
@platoneko
@starocean999
@SWJTU-ZhangLei
@wuwenchi
@xiaokang
@xinyiZzz
@Yukang-Lian
@Yulei-Yang
@zclllyybb
@zddr
@zhangstar333
@zhiqiang-hhhh
@ziyanTOP
@zy-kkk
@zzzxl1993

[xiaokang]

中文版Release Note如下：

1 行为变更

由于ADMIN SHOW xx语句在mysql 8.x jdbc driver不能执行，所以将名字改成SHOW xx

• [Refactor](admin-stmt) rename some admin-show statestmt #29492

ADMIN SHOW CONFIG -> SHOW CONFIG
ADMIN SHOW REPLICA -> SHOW REPLICA
ADMIN DIAGNOSE TABLET -> SHOW TABLET DIAGNOSIS
ADMIN SHOW TABLET -> SHOW TABLET

2 新功能

N/A

3 改进和优化

• 新优化器支持topn优化中使用倒排索引
• 限制统计信息string长度为1024以控制be内存消耗
• 修复未创建 jdbc client 时意外关闭的情况
• 接受所有iceberg database，不再做额外的名字检查
• 异步更新外表行数统计，避免同步更新带来的cache miss和plan不稳定
• 简化hive外表的isSplitable方法，避免过多的hadoop metric