huaxingao commented on a change in pull request #28220: [SPARK-31390][SQL][DOCS] Document Window Function in SQL Syntax Section URL: https://github.com/apache/spark/pull/28220#discussion_r409077765
########## File path: docs/sql-ref-syntax-qry-window.md ########## @@ -19,4 +19,208 @@ license: | limitations under the License. --- -**This page is under construction** +### Description + +Window functions operate on a group of rows, referred to as a window, and calculate an aggregated value for each row based on the specified window. Window functions are useful for processing tasks such as calculating a moving average, computing a cumulative, or accessing the value of rows given the relative position of the current row. Spark SQL supports three types of window functions: + Review comment: Also cc @srowen Please feel free to rephrase. Thanks! ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
