branch-4.1: [fix](variant) Prefer sparse variant fields over root value #65660#65950
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A distributed ordered query using TopN lazy
materialization could return an array root such as [] instead of the
object fields stored in a VARIANT row. Root visibility already
considered dense subcolumns and document snapshots but ignored sparse
subcolumns, so a non-null root incorrectly won during serialization.
Check the current row sparse offsets before treating the root as
visible. Before the fix the reproduced row returned []; after the fix it
returns {"n":7,"word":"hot"}.
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yiguolei
approved these changes
Jul 24, 2026
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Cherry-picked from #65660