Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23262#discussion_r240180713
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
---
@@ -416,7 +416,12 @@ case class DataSourceStrategy(conf: SQLConf) extends
Strategy with Logging with
output: Seq[Attribute],
rdd: RDD[Row]): RDD[InternalRow] = {
if (relation.relation.needConversion) {
- execution.RDDConversions.rowToRowRdd(rdd, output.map(_.dataType))
+ val converters = RowEncoder(StructType.fromAttributes(output))
+ rdd.mapPartitions { iterator =>
+ iterator.map { r =>
--- End diff --
nit: `iterator.map(converters.toRow)`
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