[enhancement](nereids)support topN opt in nereids #17741
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englefly
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2. pushdown limit->proj->sort
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starocean999
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1. support topN opt in nereids 2. pushdown limit->proj->sort
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Proposed changes
topN opt is implemented in original planner(refer to #15558)
This pr make nereids support this feature.
Issue Number: close #xxx
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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...