[fix](projection)join node should always output at least one column #12080
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Proposed changes
Issue Number: close #12093
Problem summary
join node should always output at least one column to get the correct row num of the join result.
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Further comments
If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...