Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/16481#discussion_r94886317
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -494,8 +500,13 @@ case class DataSource(
catalogTable = catalogTable,
fileIndex = fileIndex)
sparkSession.sessionState.executePlan(plan).toRdd
- // Replace the schema with that of the DataFrame we just wrote out
to avoid re-inferring it.
- copy(userSpecifiedSchema =
Some(data.schema.asNullable)).resolveRelation()
+ if (isForWriteOnly) {
+ // Exit earlier and return null
+ null
--- End diff --
Maybe we can change it to return an option?
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