Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6343#discussion_r30870177
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.expressions
+
+import org.apache.spark.annotation.Experimental
+import org.apache.spark.sql.Column
+import org.apache.spark.sql.catalyst.expressions._
+
+/**
+ * :: Experimental ::
+ * Utility functions for defining window in DataFrames.
+ *
+ * {{{
+ * // PARTITION BY country ORDER BY date ROWS BETWEEN UNBOUNDED
PRECEDING AND CURRENT ROW
+ *
Window.partitionBy("country").orderBy("date").rowsBetween(Long.MinValue, 0)
+ *
+ * // PARTITION BY country ORDER BY date ROWS BETWEEN 3 PRECEDING AND 3
FOLLOWING
+ * Window.partitionBy("country").orderBy("date").rowsBetween(-3, 3)
+ * }}}
+ *
+ * @since 1.4.0
+ */
+@Experimental
+object Window {
+
--- End diff --
i thought about it but i don't think there is a strong enough use case to
have that. if users complain, we can add them later.
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