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[fix](Nereids) set correct sort key for aggregate - #45369
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### What problem does this PR solve? in previous apache#44042, we supported more patterns for PushTopnToAgg rule. the new pattern: topn +-->agg(global) +-->shuffle +-->agg(local) In order to support this new pattern, the group by keys and orderkeys are identical, but group keys can be in different order. that is topn(orderkey=[B,A])->agg(groupkey=[A,B,C]) => topn(orderkey=[B, A, C]) ->agg(groupKey=[A, B, C])
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What problem does this PR solve?
in previous #44042, we supported more patterns for PushTopnToAgg rule.
the new pattern:
topn
+-->agg(global)
+-->shuffle
+-->agg(local)
In order to support this new pattern, the group by keys and orderkeys are identical, but group keys can be in different order.
that is
topn(orderkey=[B,A])->agg(groupkey=[A,B,C])
=>
topn(orderkey=[B, A, C]) ->agg(groupKey=[A, B, C])
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
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