Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20579#discussion_r175858198
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -546,6 +546,10 @@ case class DataSource(
case dataSource: CreatableRelationProvider =>
SaveIntoDataSourceCommand(data, dataSource,
caseInsensitiveOptions, mode)
case format: FileFormat =>
+ if (DataSource.isBuiltInFileBasedDataSource(format) &&
data.schema.size == 0) {
--- End diff --
actually we just need [this
check](https://github.com/apache/spark/pull/20579/files#diff-ee26d4c4be21e92e92a02e9f16dbc285R71)
here.
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