diff --git a/src/ast/query.rs b/src/ast/query.rs
index 2e44d2b79..5f4c289dc 100644
--- a/src/ast/query.rs
+++ b/src/ast/query.rs
@@ -110,9 +110,10 @@ impl fmt::Display for SetExpr {
             } => {
                 write!(f, "{left} {op}")?;
                 match set_quantifier {
-                    SetQuantifier::All | SetQuantifier::Distinct | SetQuantifier::ByName(_) => {
-                        write!(f, " {set_quantifier}")?
-                    }
+                    SetQuantifier::All
+                    | SetQuantifier::Distinct
+                    | SetQuantifier::ByName
+                    | SetQuantifier::AllByName => write!(f, " {set_quantifier}")?,
                     SetQuantifier::None => write!(f, "{set_quantifier}")?,
                 }
                 write!(f, " {right}")?;
@@ -150,7 +151,8 @@ impl fmt::Display for SetOperator {
 pub enum SetQuantifier {
     All,
     Distinct,
-    ByName(bool),
+    ByName,
+    AllByName,
     None,
 }
 
@@ -159,13 +161,8 @@ impl fmt::Display for SetQuantifier {
         match self {
             SetQuantifier::All => write!(f, "ALL"),
             SetQuantifier::Distinct => write!(f, "DISTINCT"),
-            SetQuantifier::ByName(is_all) => {
-                if *is_all {
-                    write!(f, "ALL BY NAME")
-                } else {
-                    write!(f, "BY NAME")
-                }
-            }
+            SetQuantifier::ByName => write!(f, "BY NAME"),
+            SetQuantifier::AllByName => write!(f, "ALL BY NAME"),
             SetQuantifier::None => write!(f, ""),
         }
     }
diff --git a/src/parser.rs b/src/parser.rs
index caf8c1580..4d331ce07 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -5332,10 +5332,10 @@ impl<'a> Parser<'a> {
         match op {
             Some(SetOperator::Union) => {
                 if self.parse_keywords(&[Keyword::BY, Keyword::NAME]) {
-                    SetQuantifier::ByName(false)
+                    SetQuantifier::ByName
                 } else if self.parse_keyword(Keyword::ALL) {
                     if self.parse_keywords(&[Keyword::BY, Keyword::NAME]) {
-                        SetQuantifier::ByName(true)
+                        SetQuantifier::AllByName
                     } else {
                         SetQuantifier::All
                     }
diff --git a/tests/sqlparser_duckdb.rs b/tests/sqlparser_duckdb.rs
index d13c06a89..580a4ec01 100644
--- a/tests/sqlparser_duckdb.rs
+++ b/tests/sqlparser_duckdb.rs
@@ -141,7 +141,7 @@ fn test_select_union_by_name() {
     let ast = duckdb().verified_query("SELECT * FROM capitals UNION BY NAME SELECT * FROM weather");
     let expected = Box::<SetExpr>::new(SetExpr::SetOperation {
         op: SetOperator::Union,
-        set_quantifier: SetQuantifier::ByName(false),
+        set_quantifier: SetQuantifier::ByName,
         left: Box::<SetExpr>::new(SetExpr::Select(Box::new(Select {
             distinct: None,
             top: None,
@@ -214,7 +214,7 @@ fn test_select_union_by_name() {
         duckdb().verified_query("SELECT * FROM capitals UNION ALL BY NAME SELECT * FROM weather");
     let expected = Box::<SetExpr>::new(SetExpr::SetOperation {
         op: SetOperator::Union,
-        set_quantifier: SetQuantifier::ByName(true),
+        set_quantifier: SetQuantifier::AllByName,
         left: Box::<SetExpr>::new(SetExpr::Select(Box::new(Select {
             distinct: None,
             top: None,