WangGuangxin commented on issue #27558: [SPARK-30806][SQL]Evaluate once per group in UnboundedWindowFunctionFrame URL: https://github.com/apache/spark/pull/27558#issuecomment-585618470 > Could you show us a simple query for the performance pitfall? yes, this can be reproduced by ``` spark.range(1000*1000).map(i => (i, "India")).toDF("uv", "country").createOrReplaceTempView("test") sql("select uv, country, percentile(uv, 0.95) over (partition by country) as ptc95 from test").collect.foreach(println) ```
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