[SPARK-17425][SQL] Override sameResult in HiveTableScanExec to make...

[SPARK-17425][SQL] Override sameResult in HiveTableScanExec to make ReuseExchange work in text format table

## What changes were proposed in this pull request?
The PR will override the `sameResult` in `HiveTableScanExec` to make `ReuseExchange` work in text format table.

## How was this patch tested?
# SQL
```sql
SELECT * FROM src t1
JOIN src t2 ON t1.key = t2.key
JOIN src t3 ON t1.key = t3.key;
```

# Before
```
== Physical Plan ==
*BroadcastHashJoin [key#30], [key#34], Inner, BuildRight
:- *BroadcastHashJoin [key#30], [key#32], Inner, BuildRight
:  :- *Filter isnotnull(key#30)
:  :  +- HiveTableScan [key#30, value#31], MetastoreRelation default, src
:  +- BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int, false] as bigint)))
:     +- *Filter isnotnull(key#32)
:        +- HiveTableScan [key#32, value#33], MetastoreRelation default, src
+- BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int, false] as bigint)))
   +- *Filter isnotnull(key#34)
      +- HiveTableScan [key#34, value#35], MetastoreRelation default, src
```

# After
```
== Physical Plan ==
*BroadcastHashJoin [key#2], [key#6], Inner, BuildRight
:- *BroadcastHashJoin [key#2], [key#4], Inner, BuildRight
:  :- *Filter isnotnull(key#2)
:  :  +- HiveTableScan [key#2, value#3], MetastoreRelation default, src
:  +- BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int, false] as bigint)))
:     +- *Filter isnotnull(key#4)
:        +- HiveTableScan [key#4, value#5], MetastoreRelation default, src
+- ReusedExchange [key#6, value#7], BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int, false] as bigint)))
```

cc: davies cloud-fan

Author: Yadong Qi <qiyadong2010@gmail.com>

Closes #14988 from watermen/SPARK-17425.

sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScanExec.scala

@@ -164,4 +164,19 @@ case class HiveTableScanExec(
   }
 
   override def output: Seq[Attribute] = attributes
+
+  override def sameResult(plan: SparkPlan): Boolean = plan match {
+    case other: HiveTableScanExec =>
+      val thisPredicates = partitionPruningPred.map(cleanExpression)
+      val otherPredicates = other.partitionPruningPred.map(cleanExpression)
+
+      val result = relation.sameResult(other.relation) &&
+        output.length == other.output.length &&
+          output.zip(other.output)
+            .forall(p => p._1.name == p._2.name && p._1.dataType == p._2.dataType) &&
+              thisPredicates.length == otherPredicates.length &&
+                thisPredicates.zip(otherPredicates).forall(p => p._1.semanticEquals(p._2))
+      result
+    case _ => false
+  }
 }