[jira] [Created] (SPARK-39293) The accumulator of ArrayAggregate should copy the intermediate result if string, struct, array, or map

["Takuya Ueshin (Jira)" <ji...@apache.org>]

Takuya Ueshin created SPARK-39293:
-------------------------------------

             Summary: The accumulator of ArrayAggregate should copy the intermediate result if string, struct, array, or map
                 Key: SPARK-39293
                 URL: https://issues.apache.org/jira/browse/SPARK-39293
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.1, 3.1.2, 3.0.3, 3.3.0
            Reporter: Takuya Ueshin


The accumulator of ArrayAggregate should copy the intermediate result if string, struct, array, or map.

{code:scala}
import org.apache.spark.sql.functions._

val reverse = udf((s: String) => s.reverse)

val df = Seq(Array("abc", "def")).toDF("array")
val testArray = df.withColumn(
  "agg",
  aggregate(
    col("array"),
    array().cast("array<string>"),
    (acc, s) => concat(acc, array(reverse(s)))))

aggArray.show(truncate=false)
{code}

should be:

{code}
+----------+----------+
|array     |agg       |
+----------+----------+
|[abc, def]|[cba, fed]|
+----------+----------+
{code}

but:

{code}
+----------+----------+
|array     |agg       |
+----------+----------+
|[abc, def]|[fed, fed]|
+----------+----------+
{code}





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