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https://issues.apache.org/jira/browse/SPARK-55492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18058520#comment-18058520
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Dmytro Fedoriaka commented on SPARK-55492:
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I am working on it.
> SparkException from org.apache.spark.sql.catalyst.trees.TreeNode
> ----------------------------------------------------------------
>
> Key: SPARK-55492
> URL: https://issues.apache.org/jira/browse/SPARK-55492
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.0.2, 3.5.8, 4.2.0, 4.1.1
> Reporter: Dmytro Fedoriaka
> Priority: Minor
> Labels: pull-request-available
>
> The query:
>
> {code:java}
> val df = Seq((1, ("2024-01-01 10:00:00", "val1")))
> .toDF("id", "data")
> .select(
> $"id",
> struct( to_timestamp($"data._1").as("timestamp"), $"data._2".as("value")
> ).as("nested_struct")
> )
> .select($"id", $"nested_struct".as("kolona"))
> df.withWatermark("kolona.timestamp", "0 seconds")
> {code}
> Error:
>
> {code:java}
> Failed to copy node.
> Is otherCopyArgs specified correctly for EventTimeWatermark.
> Exception message: argument type mismatch
> ...
> at org.apache.spark.sql.catalyst.trees.TreeNode.makeCopy(TreeNode.scala:941)
> ...{code}
>
> The problem is that we are trying to resolve reference for nested field, and
> nested field is not expected as eventTime column for withWatermark. The
> solution is to add a validation that forbids using nested fields in
> withWatermark.
>
>
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