huaxingao commented on code in PR #44119:
URL: https://github.com/apache/spark/pull/44119#discussion_r1427185349
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sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:
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@@ -4129,6 +4129,37 @@ class Dataset[T] private[sql](
new DataFrameWriterV2[T](table, this)
}
+ /**
+ * Create a [[DataFrameWriterV2]] for mergeInto action.
+ *
+ * Scala Examples:
+ * {{{
+ * spark.table("source")
+ * .mergeInto("target")
+ * .on($"source.id" === $"target.id")
+ * .whenMatched($"salary" === 100)
+ * .delete()
+ * .whenNotMatched()
+ * .insertAll()
+ * .whenNotMatchedBySource($"salary" === 100)
+ * .update(Map(
+ * "salary" -> lit(200)
+ * ))
+ * .merge()
+ * }}}
+ *
+ * @since 4.0.0
+ */
+ def mergeInto(table: String): DataFrameWriterV2[T] = {
+ // TODO: streaming could be adapted to use this interface
Review Comment:
Removed. Thanks
##########
sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:
##########
@@ -4129,6 +4129,37 @@ class Dataset[T] private[sql](
new DataFrameWriterV2[T](table, this)
}
+ /**
+ * Create a [[DataFrameWriterV2]] for mergeInto action.
Review Comment:
Fixed. Thanks
##########
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriterV2.scala:
##########
@@ -343,3 +572,84 @@ trait CreateTableWriter[T] extends
WriteConfigMethods[CreateTableWriter[T]] {
*/
def tableProperty(property: String, value: String): CreateTableWriter[T]
}
+
+case class WhenMatched[T] (dfWriter: DataFrameWriterV2[T], condition:
Option[Expression]) {
Review Comment:
Class docs are added. Thanks
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