cloud-fan commented on a change in pull request #31325:
URL: https://github.com/apache/spark/pull/31325#discussion_r563808912
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameWindowFunctionsSuite.scala
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@@ -1044,4 +1044,30 @@ class DataFrameWindowFunctionsSuite extends QueryTest
Row(Seq(-0.0f, 0.0f), Row(-0.0d, Double.NaN), Seq(Row(-0.0d,
Double.NaN)), 2),
Row(Seq(0.0f, -0.0f), Row(0.0d, Double.NaN), Seq(Row(0.0d, 0.0/0.0)),
2)))
}
+
+ test("SPARK-34227: WindowFunctionFrame should clear its states during
preparation") {
+ // This creates a single partition dataframe with 3 records:
+ // "a", 0, null
+ // "a", 1, "x"
+ // "b", 0, null
+ val df = spark.range(0, 3, 1, 1).select(
+ when($"id" < 2, lit("a")).otherwise(lit("b")).as("key"),
+ ($"id" % 2).cast("int").as("order"),
+ when($"id" % 2 === 0, lit(null)).otherwise(lit("x")).as("value"))
+
+ val window1 = Window.partitionBy($"key").orderBy($"order")
+ .rowsBetween(Window.unboundedPreceding, Window.unboundedFollowing)
+ val window2 = Window.partitionBy($"key").orderBy($"order")
+ .rowsBetween(Window.unboundedPreceding, Window.currentRow)
+ checkAnswer(
+ df.select(
+ $"key",
+ $"order",
+ nth_value($"value", 1, ignoreNulls = true).over(window1),
+ nth_value($"value", 1, ignoreNulls = true).over(window2)),
+ Seq(
+ Row("a", 0, "x", null),
+ Row("a", 1, "x", "x"),
+ Row("b", 0, null, null)))
Review comment:
without this fix, when processing the next partition `"b"`, states are
not reset and function still returns `"x"`
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