Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7981#discussion_r36495915
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Exchange.scala ---
@@ -124,23 +138,9 @@ case class Exchange(newPartitioning: Partitioning,
child: SparkPlan) extends Una
private val serializer: Serializer = {
val rowDataTypes = child.output.map(_.dataType).toArray
- // It is true when there is no field that needs to be write out.
- // For now, we will not use SparkSqlSerializer2 when noField is true.
- val noField = rowDataTypes == null || rowDataTypes.length == 0
-
- val useSqlSerializer2 =
- child.sqlContext.conf.useSqlSerializer2 && //
SparkSqlSerializer2 is enabled.
- SparkSqlSerializer2.support(rowDataTypes) && // The schema of row
is supported.
- !noField
-
- if (child.outputsUnsafeRows) {
- logInfo("Using UnsafeRowSerializer.")
+ if (tungstenMode) {
--- End diff --
Nit: keep the log, which is very helpful for troubleshooting.
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