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https://issues.apache.org/jira/browse/SPARK-39293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542258#comment-17542258
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Apache Spark commented on SPARK-39293:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/36674
> 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: 3.0.3, 3.1.2, 3.2.1, 3.3.0
> Reporter: Takuya Ueshin
> Priority: Major
>
> 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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