[jira] [Reopened] (SPARK-27027) from_avro function does not deserialize the Avro record of a struct column type correctly

["Gabor Somogyi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-27027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabor Somogyi reopened SPARK-27027:
-----------------------------------

> from_avro function does not deserialize the Avro record of a struct column type correctly
> -----------------------------------------------------------------------------------------
>
>                 Key: SPARK-27027
>                 URL: https://issues.apache.org/jira/browse/SPARK-27027
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Hien Luu
>            Priority: Minor
>
> {{from_avro}} function produces wrong output of a struct field.  See the output at the bottom of the description
> {code}
> import org.apache.spark.sql.types._
> import org.apache.spark.sql.avro._
> import org.apache.spark.sql.functions._
> spark.version
> val df = Seq((1, "John Doe", 30), (2, "Mary Jane", 25), (3, "Josh Duke", 50)).toDF("id", "name", "age")
> val dfStruct = df.withColumn("value", struct("name","age"))
> dfStruct.show
> dfStruct.printSchema
> val dfKV = dfStruct.select(to_avro('id).as("key"), to_avro('value).as("value"))
> val expectedSchema = StructType(Seq(StructField("name", StringType, true),StructField("age", IntegerType, false)))
> val avroTypeStruct = SchemaConverters.toAvroType(expectedSchema).toString
> val avroTypeStr = s"""
>  |{
>  | "type": "int",
>  | "name": "key"
>  |}
>  """.stripMargin
> dfKV.select(from_avro('key, avroTypeStr)).show
> dfKV.select(from_avro('value, avroTypeStruct)).show
> // output for the last statement and that is not correct
> +---------------------------------------------+
> |from_avro(value, struct<name:string,age:int>)|
> +---------------------------------------------+
> | [Josh Duke, 50]|
> | [Josh Duke, 50]|
> | [Josh Duke, 50]|
> +---------------------------------------------+
> {code}



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