[opt](Nereids) use 1 as narrowest column when do column pruning on union (#41719) #41975
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…ion (apache#41719) pick from master apache#41719 just like previous PR apache#41548 this PR process union node to ensure not require any column from its children when it is required by its parent with empty slot set
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pick from master #41719
just like previous PR #41548
this PR process union node to ensure not require any column from its children when it is required by its parent with empty slot set