Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20019#discussion_r158517049
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/ExpressionParserSuite.scala
---
@@ -263,21 +263,60 @@ class ExpressionParserSuite extends PlanTest {
"sum(product + 1) over (partition by ((product / 2) + 1) order by
2)",
WindowExpression('sum.function('product + 1),
WindowSpecDefinition(Seq('product / 2 + 1), Seq(Literal(2).asc),
UnspecifiedFrame)))
+ }
+
+ test("range/rows window function expressions") {
--- End diff --
How about `window function expressions on various window frames`?
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