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[SPARK-29419][SQL] Fix Encoder thread-safety bug in createDataset(Seq) #26076

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[SPARK-29419][SQL] Fix Encoder thread-safety bug in createDataset(Seq) #26076

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3 changes: 2 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -461,7 +461,8 @@ class SparkSession private(
* @since 2.0.0
*/
def createDataset[T : Encoder](data: Seq[T]): Dataset[T] = {
val enc = encoderFor[T]
// `ExpressionEncoder` is not thread-safe, here we create a new encoder.
val enc = encoderFor[T].copy()
val attributes = enc.schema.toAttributes
val encoded = data.map(d => enc.toRow(d).copy())
val plan = new LocalRelation(attributes, encoded)
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