xiaokang opened a new pull request, #20406:
URL: https://github.com/apache/doris/pull/20406
## Proposed changes
Issue Number: close #xxx
1. add testcase for key topn opt
2. disable key topn opt only for DUP_KEYS and UNIQUE_KEYS with MOW
3. cherry pick some bugfix commit from master
commit 58c51086ca2ad4af4a2e584cd05d1b43de41b386
Author: Kang <kxiao.ti...@gmail.com>
Date: Sun Feb 19 23:28:33 2023 +0800
[bugfix](topn) fix topn read_orderby_key_columns nullptr (#16896)
commit 479272f86fc633fbe2d92f926d4495fa56a09a64
Author: Kang <kxiao.ti...@gmail.com>
Date: Fri Mar 31 10:02:07 2023 +0800
[bugfix](topn) fix topn optimzation wrong result for NULL values (#18121)
commit d9924c9b8ec04c5c44c302f3a7638d4cc47148fc
Author: Kang <kxiao.ti...@gmail.com>
Date: Fri Feb 10 12:56:33 2023 +0800
[Improvement](topn) add limit threashold session variable and fuzzy for
topn optimizations (#16514)
1. add limit threshold for topn runtime pushdown and key topn
optimization
2. use unified session variable topn_opt_limit_threshold for all topn
optimizations
4. add fuzzy support for topn_opt_limit_threshold
## Further comments
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