viirya commented on a change in pull request #31296:
URL: https://github.com/apache/spark/pull/31296#discussion_r564385951
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
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@@ -2007,6 +2007,54 @@ class DatasetSuite extends QueryTest
checkAnswer(withUDF, Row(Row(1), null, null) :: Row(Row(1), null, null) ::
Nil)
}
+
+ test("SPARK-34205: Pipe Dataset") {
+ assume(TestUtils.testCommandAvailable("cat"))
+
+ val nums = spark.range(4)
+ val piped = nums.pipe("cat", (l, printFunc) => printFunc(l.toString)).toDF
Review comment:
> Personally, I prefer to have ScriptTransformation expression to make
this work in the first place. If we find there are more flexible usage needed,
then we can add the new API in Dataset. WDYT?
Can you share how to make transformation as an expression? I don't think It
is an expression at all.
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