diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
index 6dc5b3f28b914..46d98de6d0ec2 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
@@ -871,7 +871,7 @@ class Analyzer(
     private def dedupOuterReferencesInSubquery(
         plan: LogicalPlan,
         attrMap: AttributeMap[Attribute]): LogicalPlan = {
-      plan resolveOperatorsDown { case currentFragment =>
+      plan transformDown { case currentFragment =>
         currentFragment transformExpressions {
           case OuterReference(a: Attribute) =>
             OuterReference(dedupAttr(a, attrMap))
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
index 2bb18f48e0ae2..0ee2627814ba0 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
@@ -2554,4 +2554,29 @@ class DataFrameSuite extends QueryTest with SharedSQLContext {
 
     checkAnswer(swappedDf.filter($"key"($"map") > "a"), Row(2, Map(2 -> "b")))
   }
+
+  test("SPARK-26057: attribute deduplication on already analyzed plans") {
+    withTempView("a", "b", "v") {
+      val df1 = Seq(("1-1", 6)).toDF("id", "n")
+      df1.createOrReplaceTempView("a")
+      val df3 = Seq("1-1").toDF("id")
+      df3.createOrReplaceTempView("b")
+      spark.sql(
+        """
+          |SELECT a.id, n as m
+          |FROM a
+          |WHERE EXISTS(
+          |  SELECT 1
+          |  FROM b
+          |  WHERE b.id = a.id)
+        """.stripMargin).createOrReplaceTempView("v")
+      val res = spark.sql(
+        """
+          |SELECT a.id, n, m
+          |  FROM a
+          |  LEFT OUTER JOIN v ON v.id = a.id
+        """.stripMargin)
+      checkAnswer(res, Row("1-1", 6, 6))
+    }
+  }
 }