Github user JustinPihony commented on a diff in the pull request:
https://github.com/apache/spark/pull/12601#discussion_r60752881
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -244,7 +244,11 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
bucketSpec = getBucketSpec,
options = extraOptions.toMap)
- dataSource.write(mode, df)
+ dataSource.providingClass.newInstance() match {
+ case jdbc: execution.datasources.jdbc.DefaultSource =>
--- End diff --
I agree and admit I was being lazy in not trying to figure out how to make
the current implementation return a `BaseRelation`. I'll take another look
today at just turning the DefaultSource into a `CreatableRelationProvider`
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