branch-4.1: [feat](case when) optimize case when expression#61524

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yujun777 wants to merge 15 commits intoapache:branch-4.1from

yujun777:branch-4.1-opt-case-when

Commits on Mar 19, 2026

[feat](case when) replace null with false for case when condition (#56424)
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[feat](case when) replace nested inner case when duplicate condition to true/false (#56469)
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[feat](case when) rewrite case when to compound predicate (#56756)
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[feat](nereids) Add fold constant for nullif function (#56932)
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[feat](nereids) opt condition expression in filter / join / if /case when (#57025)
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[feat](expression rewrite) simplify expression equals true/false (#56899)
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[feat](case when) Push upper function into case when branch (#56941)
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[feat](nereids) simplify range support not equal / is null / is not null (#57537)
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[fix](simplify range) fix simplify range with null (#58451)
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[fix](nereids) fix add min max rule throw UnsupportedOperationException (#58475)
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[feat](case when) join extract or expression from case when / if / nullif expression (#58430)
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[fix](simplify range) no merge compound value with different references (#59671)
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[feat](simplify range) Add more range inference simplifier rule. (#59818)
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[fix](simplify range) fix merge with nested compound value desc (#60069)
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fix fe checkstyle
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