diff --git a/ppl-spark-integration/src/main/java/org/opensearch/sql/ast/tree/Flatten.java b/ppl-spark-integration/src/main/java/org/opensearch/sql/ast/tree/Flatten.java
index d6885b299..36c126591 100644
--- a/ppl-spark-integration/src/main/java/org/opensearch/sql/ast/tree/Flatten.java
+++ b/ppl-spark-integration/src/main/java/org/opensearch/sql/ast/tree/Flatten.java
@@ -17,7 +17,7 @@ public class Flatten extends UnresolvedPlan {
     @Getter
     private final Field field;
     @Getter
-    private final List<UnresolvedExpression> aliases;
+    private final List<UnresolvedExpression> aliasSequence;
 
     @Override
     public UnresolvedPlan attach(UnresolvedPlan child) {
diff --git a/ppl-spark-integration/src/main/java/org/opensearch/sql/ppl/CatalystQueryPlanVisitor.java b/ppl-spark-integration/src/main/java/org/opensearch/sql/ppl/CatalystQueryPlanVisitor.java
index 3ea1acb75..af94dd004 100644
--- a/ppl-spark-integration/src/main/java/org/opensearch/sql/ppl/CatalystQueryPlanVisitor.java
+++ b/ppl-spark-integration/src/main/java/org/opensearch/sql/ppl/CatalystQueryPlanVisitor.java
@@ -460,7 +460,7 @@ public LogicalPlan visitFlatten(Flatten flatten, CatalystPlanContext context) {
             context.getNamedParseExpressions().push(UnresolvedStar$.MODULE$.apply(Option.<Seq<String>>empty()));
         }
         Expression field = visitExpression(flatten.getField(), context);
-        List<Expression> alias = flatten.getAliases().stream()
+        List<Expression> alias = flatten.getAliasSequence().stream()
             .map(aliasNode -> visitExpression(aliasNode, context))
             .collect(Collectors.toList());
         context.retainAllNamedParseExpressions(p -> (NamedExpression) p);