[SPARK-29682][SQL] Resolve conflicting attributes in Expand correctly

### What changes were proposed in this pull request?

This PR addresses issues where conflicting attributes in `Expand` are not correctly handled.

### Why are the changes needed?

```Scala
val numsDF = Seq(1, 2, 3, 4, 5, 6).toDF("nums")
val cubeDF = numsDF.cube("nums").agg(max(lit(0)).as("agcol"))
cubeDF.join(cubeDF, "nums").show
```
fails with the following exception:
```
org.apache.spark.sql.AnalysisException:
Failure when resolving conflicting references in Join:
'Join Inner
:- Aggregate [nums#38, spark_grouping_id#36], [nums#38, max(0) AS agcol#35]
:  +- Expand [List(nums#3, nums#37, 0), List(nums#3, null, 1)], [nums#3, nums#38, spark_grouping_id#36]
:     +- Project [nums#3, nums#3 AS nums#37]
:        +- Project [value#1 AS nums#3]
:           +- LocalRelation [value#1]
+- Aggregate [nums#38, spark_grouping_id#36], [nums#38, max(0) AS agcol#58]
   +- Expand [List(nums#3, nums#37, 0), List(nums#3, null, 1)], [nums#3, nums#38, spark_grouping_id#36]
                                                                         ^^^^^^^
      +- Project [nums#3, nums#3 AS nums#37]
         +- Project [value#1 AS nums#3]
            +- LocalRelation [value#1]

Conflicting attributes: nums#38
```
As you can see from the above plan, `num#38`, the output of `Expand` on the right side of `Join`, should have been handled to produce new attribute. Since the conflict is not resolved in `Expand`, the failure is happening upstream at `Aggregate`. This PR addresses handling conflicting attributes in `Expand`.

### Does this PR introduce any user-facing change?

Yes, the previous example now shows the following output:
```
+----+-----+-----+
|nums|agcol|agcol|
+----+-----+-----+
|   1|    0|    0|
|   6|    0|    0|
|   4|    0|    0|
|   2|    0|    0|
|   5|    0|    0|
|   3|    0|    0|
+----+-----+-----+
```
### How was this patch tested?

Added new unit test.

Closes apache#26441 from imback82/spark-29682.

Authored-by: Terry Kim <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala

@@ -972,6 +972,18 @@ class Analyzer(
           val newOutput = oldVersion.generatorOutput.map(_.newInstance())
           (oldVersion, oldVersion.copy(generatorOutput = newOutput))
 
+        case oldVersion: Expand
+            if oldVersion.producedAttributes.intersect(conflictingAttributes).nonEmpty =>
+          val producedAttributes = oldVersion.producedAttributes
+          val newOutput = oldVersion.output.map { attr =>
+            if (producedAttributes.contains(attr)) {
+              attr.newInstance()
+            } else {
+              attr
+            }
+          }
+          (oldVersion, oldVersion.copy(output = newOutput))
+
         case oldVersion @ Window(windowExpressions, _, _, child)
             if AttributeSet(windowExpressions.map(_.toAttribute)).intersect(conflictingAttributes)
               .nonEmpty =>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala

@@ -672,6 +672,8 @@ case class Expand(
   override lazy val references: AttributeSet =
     AttributeSet(projections.flatten.flatMap(_.references))
 
+  override def producedAttributes: AttributeSet = AttributeSet(output diff child.output)
+
   // This operator can reuse attributes (for example making them null when doing a roll up) so
   // the constraints of the child may no longer be valid.
   override protected lazy val validConstraints: Set[Expression] = Set.empty[Expression]

sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala

@@ -3304,6 +3304,15 @@ class SQLQuerySuite extends QueryTest with SharedSparkSession {
         """.stripMargin).collect()
     }
   }
+
+  test("SPARK-29682: Conflicting attributes in Expand are resolved") {
+    val numsDF = Seq(1, 2, 3).toDF("nums")
+    val cubeDF = numsDF.cube("nums").agg(max(lit(0)).as("agcol"))
+
+    checkAnswer(
+      cubeDF.join(cubeDF, "nums"),
+      Row(1, 0, 0) :: Row(2, 0, 0) :: Row(3, 0, 0) :: Nil)
+  }
 }
 
 case class Foo(bar: Option[String])