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【需求背景】
explain (analyse, buffers)
select * from (
select row_number() over(partition by c1, c3 order by c2) as rn,
* from t_winfn
) foo
where rn <= 1;
类似上述语句，过滤条件在PG中已经实现下推。
【需求描述】
下推Window函数过滤条件，提前过滤数据，提升更上层算子的执行效率。
【其他说明】
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