cloud-fan commented on code in PR #44119:
URL: https://github.com/apache/spark/pull/44119#discussion_r1429449276
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sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriterV2.scala:
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@@ -167,6 +173,59 @@ final class DataFrameWriterV2[T] private[sql](table:
String, ds: Dataset[T])
runCommand(overwrite)
}
+ def on(condition: Column): MergeIntoWriter[T] = {
+ this.on = Some(condition)
+ this
+ }
+
+ def whenMatched(): WhenMatched[T] = {
+ new WhenMatched[T](this, None)
+ }
+
+ def whenMatched(condition: Column): WhenMatched[T] = {
+ new WhenMatched[T](this, Some(condition.expr))
+ }
+
+ def whenNotMatched(): WhenNotMatched[T] = {
+ new WhenNotMatched[T](this, None)
+ }
+
+ def whenNotMatched(condition: Column): WhenNotMatched[T] = {
+ new WhenNotMatched[T](this, Some(condition.expr))
+ }
+
+ def whenNotMatchedBySource(): WhenNotMatchedBySource[T] = {
+ new WhenNotMatchedBySource[T](this, None)
+ }
+
+ def whenNotMatchedBySource(condition: Column): WhenNotMatchedBySource[T] = {
+ new WhenNotMatchedBySource[T](this, Some(condition.expr))
+ }
+
+ /**
+ * Executes the merge operation.
+ */
+ def merge(): Unit = {
+ if (on.isEmpty) {
+ throw new IllegalStateException("The 'on' condition cannot be None")
+ }
+
+ if (matchedActions.isEmpty && notMatchedActions.isEmpty &&
notMatchedBySourceActions.isEmpty) {
+ throw new IllegalStateException("At least one of matchedActions,
notMatchedActions," +
Review Comment:
nit: this is a user error, let's add an error class for it.
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