Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14822#discussion_r76368571
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala
---
@@ -390,48 +390,69 @@ abstract class DeclarativeAggregate
}
}
+
/**
* Aggregation function which allows **arbitrary** user-defined java
object to be used as internal
- * aggregation buffer object.
+ * aggregation buffer.
*
* {{{
- * aggregation buffer for normal aggregation function `avg`
- * |
- * v
- *
+--------------+---------------+-----------------------------------+
- * | sum1 (Long) | count1 (Long) | generic user-defined
java objects |
- *
+--------------+---------------+-----------------------------------+
- * ^
- * |
- * Aggregation buffer object for
`TypedImperativeAggregate` aggregation function
+ * aggregation buffer for normal aggregation function `avg`
aggregate buffer for `sum`
+ * |
|
+ * v
v
+ *
+--------------+---------------+-----------------------------------+-------------+
+ * | sum1 (Long) | count1 (Long) | generic user-defined java
objects | sum2 (Long) |
--- End diff --
this addresses https://github.com/apache/spark/pull/14753/files#r76152853
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