change hashSet name

Author: adrian-wang

sql/core/src/main/scala/org/apache/spark/sql/execution/joins.scala

@@ -169,24 +169,24 @@ case class LeftSemiJoinHash(
   def execute() = {
 
     buildPlan.execute().zipPartitions(streamedPlan.execute()) { (buildIter, streamIter) =>
-      val hashTable = new java.util.HashSet[Row]()
+      val hashSet = new java.util.HashSet[Row]()
       var currentRow: Row = null
 
       // Create a Hash set of buildKeys
       while (buildIter.hasNext) {
         currentRow = buildIter.next()
         val rowKey = buildSideKeyGenerator(currentRow)
         if(!rowKey.anyNull) {
-          val keyExists = hashTable.contains(rowKey)
+          val keyExists = hashSet.contains(rowKey)
           if (!keyExists) {
-            hashTable.add(rowKey)
+            hashSet.add(rowKey)
           }
         }
       }
 
+      val joinKeys = streamSideKeyGenerator()
       streamIter.filter(current => {
-        val joinKeys = streamSideKeyGenerator()
-        !joinKeys(current).anyNull && hashTable.contains(joinKeys.currentValue)
+        !joinKeys(current).anyNull && hashSet.contains(joinKeys.currentValue)
       })
     }
   }