[GLUTEN-11849][CH] Fix diff for var_samp returns NaN instead of NULL when effective row count < 2#11850
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lgbo-ustc merged 1 commit intoapache:mainfrom Apr 7, 2026
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…when effective row count < 2
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…when effective row count < 2 (apache#11850) Co-authored-by: xumingyong <xumingyong@bigo.sg>
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What changes are proposed in this pull request?
Fix diff for var_samp returns NaN instead of NULL when effective row count < 2
How was this patch tested?
Add ut
Was this patch authored or co-authored using generative AI tooling?
co-authored with copilot cli
Related issue: #11849