cloud-fan commented on code in PR #44119:
URL: https://github.com/apache/spark/pull/44119#discussion_r1429453554
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sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriterV2.scala:
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@@ -343,3 +402,312 @@ trait CreateTableWriter[T] extends
WriteConfigMethods[CreateTableWriter[T]] {
*/
def tableProperty(property: String, value: String): CreateTableWriter[T]
}
+
+trait MergeIntoWriter[T] {
+
+ /**
+ * Specifies the merge condition.
+ *
+ * Sets the condition to be used for merging data. This condition is used to
determine
+ * how rows from the source DataFrame are matched with rows in the target
table.
+ *
+ * @param condition a `Column` representing the merge condition.
+ * @return the current `DataFrameWriterV2` instance with the specified merge
condition set.
+ */
+ def on(condition: Column): MergeIntoWriter[T]
+
+ /**
+ * Initialize a `WhenMatched` action without any condition.
+ *
+ * This `WhenMatched` can be followed by one of the following merge actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @return a new `WhenMatched` object.
+ */
+ def whenMatched(): WhenMatched[T]
+
+ /**
+ * Initialize a `WhenMatched` action with a condition.
+ *
+ * This `WhenMatched` action will be executed if and only if the specified
`condition`
+ * is satisfied.
+ *
+ * This `WhenMatched` can be followed by one of the following merge actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @param condition a `Column` representing the condition to be evaluated
for the action.
+ * @return a new `WhenMatched` object configured with the specified
condition.
+ */
+ def whenMatched(condition: Column): WhenMatched[T]
+
+ /**
+ * Initialize a `WhenNotMatched` action without any condition.
+ *
+ * This `WhenNotMatched` can be followed by one of the following merge
actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `insertAll`: Insert all the target table with source dataset records.
+ * - `insert(Map)`: Insert all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @return a new `WhenNotMatched` object.
+ */
+ def whenNotMatched(): WhenNotMatched[T]
+
+ /**
+ * Initialize a `WhenNotMatched` action with a condition.
+ *
+ * This `WhenNotMatched` action will be executed if and only if the
specified `condition`
+ * is satisfied.
+ *
+ * This `WhenNotMatched` can be followed by one of the following merge
actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `insertAll`: Insert all the target table with source dataset records.
+ * - `insert(Map)`: Insert all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @param condition a `Column` representing the condition to be evaluated
for the action.
+ * @return a new `WhenNotMatched` object configured with the specified
condition.
+ */
+ def whenNotMatched(condition: Column): WhenNotMatched[T]
+
+ /**
+ * Initialize a `WhenNotMatchedBySource` action without any condition.
+ *
+ * This `WhenNotMatchedBySource` can be followed by one of the following
merge actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `insertAll`: Insert all the target table with source dataset records.
+ * - `insert(Map)`: Insert all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @return a new `WhenNotMatchedBySource` object.
+ */
+ def whenNotMatchedBySource(): WhenNotMatchedBySource[T]
+
+ /**
+ * Initialize a `WhenNotMatchedBySource` action with a condition.
+ *
+ * This `WhenNotMatchedBySource` action will be executed if and only if the
specified `condition`
+ * is satisfied.
+ *
+ * This `WhenNotMatchedBySource` can be followed by one of the following
merge actions:
+ * - `updateAll`: Update all the target table fields with source dataset
fields.
+ * - `update(Map)`: Update all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `insertAll`: Insert all the target table with source dataset records.
+ * - `insert(Map)`: Insert all the target table records while changing only
+ * a subset of fields based on the provided assignment.
+ * - `delete`: Delete all the target table records.
+ *
+ * @param condition a `Column` representing the condition to be evaluated
for the action.
+ * @return a new `WhenNotMatchedBySource` object configured with the
specified condition.
+ */
+ def whenNotMatchedBySource(condition: Column): WhenNotMatchedBySource[T]
+}
+
+/**
+ * A class for defining actions to be taken when matching rows in a DataFrame
during
+ * an update operation.
+ *
+ * @param dfWriter The DataFrameWriterV2 instance responsible for writing
data to a
+ * target DataFrame.
+ * @param condition An optional condition Expression that specifies when the
actions
+ * should be applied.
+ * If the condition is None, the actions will be applied to
all matched rows.
+ *
+ * @tparam T The type of data in the DataFrame.
+ */
+case class WhenMatched[T] (dfWriter: DataFrameWriterV2[T], condition:
Option[Expression]) {
+ /**
+ * Specifies an action to update all matched rows in the DataFrame.
+ *
+ * @return The DataFrameWriterV2 instance with the update all action
configured.
+ */
+ def updateAll(): DataFrameWriterV2[T] = {
+ dfWriter.matchedActions = dfWriter.matchedActions :+
UpdateStarAction(condition)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to update matched rows in the DataFrame with the
provided column
+ * assignments.
+ *
+ * @param set A Map of column names to Column expressions representing the
updates to be applied.
+ * @return The DataFrameWriterV2 instance with the update action configured.
+ */
+ def update(set: Map[String, Column]): DataFrameWriterV2[T] = {
+ dfWriter.matchedActions = dfWriter.matchedActions :+
+ UpdateAction(condition, set.map(x => Assignment(expr(x._1).expr,
x._2.expr)).toSeq)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to delete matched rows from the DataFrame.
+ *
+ * @return The DataFrameWriterV2 instance with the delete action configured.
+ */
+ def delete(): DataFrameWriterV2[T] = {
+ dfWriter.matchedActions = dfWriter.matchedActions :+
DeleteAction(condition)
+ this.dfWriter
+ }
+}
+
+/**
+ * A class for defining actions to be taken when no matching rows are found in
a DataFrame
+ * during an update operation.
+ *
+ * @param dfWriter The DataFrameWriterV2 instance responsible for writing
data to a
+ * target DataFrame.
+ * @param condition An optional condition Expression that specifies when the
actions
+ * defined in this configuration should be applied.
+ * If the condition is None, the actions will be applied
when there
+ * are no matching rows.
+ *
+ * @tparam T The type of data in the DataFrame.
+ */
+case class WhenNotMatched[T] (dfWriter: DataFrameWriterV2[T], condition:
Option[Expression]) {
+ /**
+ * Specifies an action to update all non-matched rows in the DataFrame.
+ *
+ * @return The DataFrameWriterV2 instance with the update all action
configured.
+ */
+ def updateAll(): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedActions = dfWriter.notMatchedActions :+
UpdateStarAction(condition)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to update non-matched rows in the DataFrame with the
provided
+ * column assignments.
+ *
+ * @param set A Map of column names to Column expressions representing the
updates to be applied.
+ * @return The DataFrameWriterV2 instance with the update action configured.
+ */
+ def update(set: Map[String, Column]): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedActions = dfWriter.notMatchedActions :+
+ UpdateAction(condition, set.map(x => Assignment(expr(x._1).expr,
x._2.expr)).toSeq)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to insert all non-matched rows into the DataFrame.
+ *
+ * @return The DataFrameWriterV2 instance with the insert all action
configured.
+ */
+ def insertAll(): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedActions = dfWriter.notMatchedActions :+
InsertStarAction(condition)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to insert non-matched rows into the DataFrame with
the provided
+ * column assignments.
+ *
+ * @param set A Map of column names to Column expressions representing the
values to be inserted.
+ * @return The DataFrameWriterV2 instance with the insert action configured.
+ */
+ def insert(set: Map[String, Column]): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedActions = dfWriter.notMatchedActions :+
+ InsertAction(condition, set.map(x => Assignment(expr(x._1).expr,
x._2.expr)).toSeq)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to delete non-matched rows from the DataFrame.
+ *
+ * @return The DataFrameWriterV2 instance with the delete action configured.
+ */
+ def delete(): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedActions = dfWriter.notMatchedActions :+
DeleteAction(condition)
+ this.dfWriter
+ }
+}
+
+/**
+ * A class for defining actions to be performed when there is no match by
source
+ * during a merge operation in a DataFrameWriterV2.
+ *
+ * @param dfWriter the DataFrameWriterV2 instance to which the merge actions
will be applied.
+ * @param condition an optional condition to be used with the merge actions.
+ * @tparam T the type parameter for the DataFrameWriterV2.
+ */
+case class WhenNotMatchedBySource[T] (
+ dfWriter: DataFrameWriterV2[T],
+ condition: Option[Expression]) {
+
+ /**
+ * Specifies an action to update all non-matched rows in the target
DataFrame when
+ * not matched by the source.
+ *
+ * @return The DataFrameWriterV2 instance with the update all action
configured.
+ */
+ def updateAll(): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedBySourceActions =
+ dfWriter.notMatchedBySourceActions :+ UpdateStarAction(condition)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to update non-matched rows in the target DataFrame
with the provided
+ * column assignments when not matched by the source.
+ *
+ * @param set A Map of column names to Column expressions representing the
updates to be applied.
+ * @return The DataFrameWriterV2 instance with the update action configured.
+ */
+ def update(set: Map[String, Column]): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedBySourceActions = dfWriter.notMatchedBySourceActions :+
+ UpdateAction(condition, set.map(x => Assignment(expr(x._1).expr,
x._2.expr)).toSeq)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to insert all non-matched rows into the target
DataFrame when not
+ * matched by the source.
+ *
+ * @return The DataFrameWriterV2 instance with the insert all action
configured.
+ */
+ def insertAll(): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedBySourceActions =
+ dfWriter.notMatchedBySourceActions :+ InsertStarAction(condition)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to insert non-matched rows into the target DataFrame
with the provided
+ * column assignments when not matched by the source.
+ *
+ * @param set A Map of column names to Column expressions representing the
values to be inserted.
+ * @return The DataFrameWriterV2 instance with the insert action configured.
+ */
+ def insert(set: Map[String, Column]): DataFrameWriterV2[T] = {
+ dfWriter.notMatchedBySourceActions = dfWriter.notMatchedBySourceActions :+
+ InsertAction(condition, set.map(x => Assignment(expr(x._1).expr,
x._2.expr)).toSeq)
+ this.dfWriter
+ }
+
+ /**
+ * Specifies an action to delete non-matched rows from the target DataFrame
when not matched by
+ * the source.
+ *
+ * @return The DataFrameWriterV2 instance with the delete action configured.
+ */
+ def delete(): DataFrameWriterV2[T] = {
Review Comment:
ditto, the SQL grammar does not have DELETE clause in `WHEN NOT MATCHED BY
SOURCE`
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