Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/13286#discussion_r64796643
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -319,14 +362,19 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
checkpointPath.toUri.toString
}
- val sink = new MemorySink(df.schema)
+ if (!Seq(OutputMode.Append,
OutputMode.Complete).contains(outputMode)) {
--- End diff --
The tricky thing is that we want to make the Memory Sink compatible with
update internally, but we may not want public API to support update mode yet.
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