jaceklaskowski
Mastering Apache Spark 2 (Spark 2.2+)

Updated 2 months ago

lalit lakhotia (@lalitlakhotia1) started discussion #143

10 months ago · 0 comments

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Windowed Aggregates (aka window functions) are functions that perform a calculation on a group of records (called a window) that are in some relation to the current record.

Window Aggregates (Edit this file)

Can we do Window Aggregation on UDAF?

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陈浩 @bettermouse commented 3 months ago

Using Window Functions

Spark SQL supports three kinds of window functions: ranking functions, analytic functions, and aggregate functions. The available ranking functions and analytic functions are summarized in the table below. For aggregate functions, users can use any existing aggregate function as a window function.

https://databricks.com/blog/2015/07/15/introducing-window-functions-in-spark-sql.html

I think we can use UDAF


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