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[SPARK-16173] [SQL] Can't join describe() of DataFrame in Scala 2.10 #13902

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[SPARK-16173] [SQL] Can't join describe() of DataFrame in Scala 2.10 #13902

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3 changes: 2 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1363,7 +1363,8 @@ class DataFrame private[sql](
// All columns are string type
val schema = StructType(
StructField("summary", StringType) :: outputCols.map(StructField(_, StringType))).toAttributes
LocalRelation.fromExternalRows(schema, ret)
// `toArray` forces materialization to make the seq serializable
LocalRelation.fromExternalRows(schema, ret.toArray.toSeq)
}

/**
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