huangxiaopingRD commented on code in PR #52993:
URL: https://github.com/apache/spark/pull/52993#discussion_r2516406229
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InferWindowGroupLimit.scala:
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@@ -26,12 +26,29 @@ import
org.apache.spark.sql.catalyst.trees.TreePattern.{FILTER, WINDOW}
* Inserts a `WindowGroupLimit` below `Window` if the `Window` has rank-like
functions
* and the function results are further filtered by limit-like predicates.
Example query:
* {{{
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE rn = 5
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE 5 = rn
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE rn < 5
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE 5 > rn
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE rn <= 5
- * SELECT *, ROW_NUMBER() OVER(PARTITION BY k ORDER BY a) AS rn FROM Tab1
WHERE 5 >= rn
+ * SELECT * FROM (
Review Comment:
The original example had a grammatical error. It cannot reference the `rn`
column within a `where` clause.
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