[Fix-3.0](iot) Avoid coredump because of NullPointerException#55597

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zclllyybb wants to merge 572 commits intoapache:branch-3.1from

zclllyybb:iot30

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Commits on Jul 29, 2025

branch-3.0: [fix](cloud) add log for warm up task #52946 (#53959)
deardeng
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Commits on Jul 30, 2025

branch-3.0:[fix](audit)Fixed an issue that the audit log would record the previo… (#54008)
zddr
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branch-3.0: [fix](audit) fix invalid audit log column and line separator #52968 (#54059)
morningman
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branch-3.0: [regression-test](variant) Add variant upgrade case #53842 (#53880)

github-actions[bot]
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XueYuhai
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[fix](schema-change) Forbid dropping distribution columns (branch-3.0) (#54037)
Hastyshell
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[fix](schema-change) Rebuild distribution info according to original order (#54024) (#54072) (#54109)
Hastyshell
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Commits on Jul 31, 2025

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branch-3.0: [chore](case) log msg to investigate failure cases #54063 (#54203)

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dataroaring
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Commits on Aug 3, 2025

branch-3.0: [fix](regression) Fix cached cloud partition version #54092 (#54209)

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gavinchou
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branch-3.0: [fix](case) fix some case (#54481) (#54560)
mymeiyi
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branch-3.0: [fix](csv reader) fix csv parse error when use enclose with multi-char column separator (#54581) (#55052)
sollhui
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Commits on Aug 24, 2025

Commits on Aug 27, 2025

branch-3.0: [chore](case) do not use global var #55280 (#55314)

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dataroaring
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Commits on Aug 29, 2025

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[chore](cloud) Optimize RPC log #53341 (#54217)
gavinchou
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branch-3.0: [fix](job) use cluster name rather than cluster id to find available be (#52911) (#55563)
sollhui
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