zml1206 opened a new pull request, #40115:
URL: https://github.com/apache/spark/pull/40115
### What changes were proposed in this pull request?
Extend the CollapseWindow rule to collapse Window nodes, when one window in
subquery.
### Why are the changes needed?
```
select a, b, c, row_number() over (partition by a order by b) as d from
( select a, b, rank() over (partition by a order by b) as c from t1) t2
== Optimized Logical Plan ==
before
Window [row_number() windowspecdefinition(a#11, b#12 ASC NULLS FIRST,
specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$())) AS d#26],
[a#11], [b#12 ASC NULLS FIRST]
+- Window [rank(b#12) windowspecdefinition(a#11, b#12 ASC NULLS FIRST,
specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$())) AS c#25],
[a#11], [b#12 ASC NULLS FIRST]
+- InMemoryRelation [a#11, b#12], StorageLevel(disk, memory,
deserialized, 1 replicas)
+- *(1) Project [_1#6 AS a#11, _2#7 AS b#12]
+- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0,
scala.Tuple2, true]))._1 AS _1#6, knownnotnull(assertnotnull(input[0,
scala.Tuple2, true]))._2 AS _2#7]
+- *(1) MapElements
org.apache.spark.sql.DataFrameSuite$$Lambda$1517/1628848368@3a479fda, obj#5:
scala.Tuple2
+- *(1) DeserializeToObject staticinvoke(class
java.lang.Long, ObjectType(class java.lang.Long), valueOf, id#0L, true, false,
true), obj#4: java.lang.Long
+- *(1) Range (0, 10, step=1, splits=2)
after
Window [rank(b#12) windowspecdefinition(a#11, b#12 ASC NULLS FIRST,
specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$())) AS c#25,
row_number() windowspecdefinition(a#11, b#12 ASC NULLS FIRST,
specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$())) AS d#26],
[a#11], [b#12 ASC NULLS FIRST]
+- InMemoryRelation [a#11, b#12], StorageLevel(disk, memory, deserialized, 1
replicas)
+- *(1) Project [_1#6 AS a#11, _2#7 AS b#12]
+- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0,
scala.Tuple2, true]))._1 AS _1#6, knownnotnull(assertnotnull(input[0,
scala.Tuple2, true]))._2 AS _2#7]
+- *(1) MapElements
org.apache.spark.sql.DataFrameSuite$$Lambda$1518/1928028672@4d7a64ca, obj#5:
scala.Tuple2
+- *(1) DeserializeToObject staticinvoke(class
java.lang.Long, ObjectType(class java.lang.Long), valueOf, id#0L, true, false,
true), obj#4: java.lang.Long
+- *(1) Range (0, 10, step=1, splits=2)
```
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
UT
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