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https://issues.apache.org/jira/browse/SPARK-26845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16763391#comment-16763391
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Dongjoon Hyun commented on SPARK-26845:
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cc [~Gengliang.Wang]
> Avro to_avro from_avro roundtrip fails if data type is string
> -------------------------------------------------------------
>
> Key: SPARK-26845
> URL: https://issues.apache.org/jira/browse/SPARK-26845
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0, 3.0.0
> Reporter: Gabor Somogyi
> Priority: Critical
> Labels: correctness
>
> I was playing with AvroFunctionsSuite and created a situation where test
> fails which I believe it shouldn't:
> {code:java}
> test("roundtrip in to_avro and from_avro - string") {
> val df = spark.createDataset(Seq("1", "2",
> "3")).select('value.cast("string").as("str"))
> val avroDF = df.select(to_avro('str).as("b"))
> val avroTypeStr = s"""
> |{
> | "type": "string",
> | "name": "str"
> |}
> """.stripMargin
> checkAnswer(avroDF.select(from_avro('b, avroTypeStr)), df)
> }
> {code}
> {code:java}
> == Results ==
> !== Correct Answer - 3 == == Spark Answer - 3 ==
> !struct<str:string> struct<from_avro(b):string>
> ![1] []
> ![2] []
> ![3] []
> {code}
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