diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala
index f93e5736de401..7f45c96f85455 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.sql.catalyst.expressions
 
-import scala.collection.mutable
+import scala.collection.{mutable, GenTraversableOnce}
 import scala.collection.mutable.ArrayBuffer
 
 object ExpressionSet {
@@ -67,6 +67,12 @@ class ExpressionSet protected(
     newSet
   }
 
+  override def ++(elems: GenTraversableOnce[Expression]): ExpressionSet = {
+    val newSet = new ExpressionSet(baseSet.clone(), originals.clone())
+    elems.foreach(newSet.add)
+    newSet
+  }
+
   override def -(elem: Expression): ExpressionSet = {
     val newBaseSet = baseSet.clone().filterNot(_ == elem.canonicalized)
     val newOriginals = originals.clone().filterNot(_.canonicalized == elem.canonicalized)
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala
index d617ad540d5ff..e5d8771564ad2 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala
@@ -210,4 +210,14 @@ class ExpressionSetSuite extends SparkFunSuite {
     assert((initialSet - (aLower + 1)).size == 0)
 
   }
+
+  test("add multiple elements to set") {
+    val initialSet = ExpressionSet(aUpper + 1 :: Nil)
+    val setToAddWithSameExpression = ExpressionSet(aUpper + 1 :: aUpper + 2 :: Nil)
+    val setToAddWithOutSameExpression = ExpressionSet(aUpper + 3 :: aUpper + 4 :: Nil)
+
+    assert((initialSet ++ setToAddWithSameExpression).size == 2)
+    assert((initialSet ++ setToAddWithOutSameExpression).size == 3)
+  }
+
 }