[fix](Nerieds) column prune should retain at least one column for union all (#41613) #41771
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…on all (apache#41613) select count(1) from(select 3, 6 union all select 1, 3) t wrong LogicalUnion plan: LogicalUnion( qualifier=ALL, outputs=[3#6], regularChildrenOutputs=[], constantExprsList=[[], []], hasPushedFilter=false this sql will report error in explain, because the logical union outputs has a slot, but the logical union has no child and has a empty constantExprList, which is wrong set in column prune. this pr fixes it by consider when require columns is empty and keep the min slot and min slot corresponding const expressions.
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run buildall |
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run p0 |
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cherry-pick #41613 to branch-2.1