zhengruifeng commented on PR #36062:
URL: https://github.com/apache/spark/pull/36062#issuecomment-1087576474
```
import org.apache.spark.ml.stat.pandas._
val seq = Array.range(0, 10000000).map(_.toDouble / 10).zipWithIndex
val df = sc.parallelize(seq).toDF("value", "index")
EWM.ewm(df, Seq(col("index")), Seq(col("value")), alpha=Some(0.5)).show()
scala> EWM.ewm(df, Seq(col("index")), Seq(col("value")),
alpha=Some(0.5)).show()
22/04/04 21:27:24 WARN TaskSetManager: Stage 0 contains a task of very large
size (24418 KiB). The maximum recommended task size is 1000 KiB.
22/04/04 21:27:37 WARN TaskSetManager: Stage 1 contains a task of very large
size (24418 KiB). The maximum recommended task size is 1000 KiB.
numPartitions: 13 (0 + 12) /
12]
col 0:
[(0,0),(149803.000,2.00000000),(300353.600,2.00000000),(458835.600,2.00000000),(619207.000,2.00000000),(779324.800,2.00000000),(939453.800,2.00000000),(1108437.20,2.00000000),(1270155.40,2.00000000),(1438556.80,2.00000000),(1608458.00,2.00000000),(1769088.60,2.00000000),(1928755.20,2.00000000)]
22/04/04 21:27:53 WARN TaskSetManager: Stage 4 contains a task of very large
size (24418 KiB). The maximum recommended task size is 1000 KiB.
22/04/04 21:28:03 WARN TaskSetManager: Stage 5 contains a task of very large
size (24418 KiB). The maximum recommended task size is 1000 KiB.
22/04/04 21:28:14 WARN DAGScheduler: Broadcasting large task binary with
size 2.3 MiB
+-----+--------------------+
|index| _ewma_|
+-----+--------------------+
| 0| [0.0]|
| 1|[0.06666666666666...|
| 2|[0.14285714285714...|
| 3|[0.22666666666666...|
| 4|[0.3161290322580645]|
| 5|[0.4095238095238095]|
| 6|[0.5055118110236221]|
| 7|[0.6031372549019608]|
| 8|[0.7017612524461839]|
| 9|[0.8009775171065494]|
| 10|[0.9005373717635564]|
| 11|[1.0002930402930403]|
| 12|[1.1001587107801245]|
| 13|[1.2000854544344748]|
| 14| [1.300045777764214]|
| 15|[1.4000244144350347]|
| 16| [1.500012970069657]|
| 17|[1.6000068664812717]|
| 18|[1.7000036239693146]|
| 19|[1.8000019073504518]|
+-----+--------------------+
only showing top 20 rows
```
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