[pick](Serde-2.1) fix variant serde may lost num_rows when subcolumns empty #41438
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… empty (apache#38413) serialization object with empty subcolumns may lost num_rows, so need to record num_rows and set back num_rows in serdes backport apache#38413
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run buildall |
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clang-tidy review says "All clean, LGTM! 👍" |
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TeamCity be ut coverage result: |
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serialization object with empty subcolumns may lost num_rows, so need to record num_rows and set back num_rows in serdes
backport #38413