diff --git a/proto/substrait/algebra.proto b/proto/substrait/algebra.proto
index a205853a6..6b49d5d82 100644
--- a/proto/substrait/algebra.proto
+++ b/proto/substrait/algebra.proto
@@ -259,25 +259,25 @@ message JoinRel {
 
   JoinType type = 6;
 
-  enum JoinType {
-    JOIN_TYPE_UNSPECIFIED = 0;
-    JOIN_TYPE_INNER = 1;
-    JOIN_TYPE_OUTER = 2;
-    JOIN_TYPE_LEFT = 3;
-    JOIN_TYPE_RIGHT = 4;
-    JOIN_TYPE_LEFT_SEMI = 5;
-    JOIN_TYPE_LEFT_ANTI = 6;
-    JOIN_TYPE_LEFT_SINGLE = 7;
-    JOIN_TYPE_RIGHT_SEMI = 8;
-    JOIN_TYPE_RIGHT_ANTI = 9;
-    JOIN_TYPE_RIGHT_SINGLE = 10;
-    JOIN_TYPE_LEFT_MARK = 11;
-    JOIN_TYPE_RIGHT_MARK = 12;
-  }
-
   substrait.extensions.AdvancedExtension advanced_extension = 10;
 }
 
+enum JoinType {
+  JOIN_TYPE_UNSPECIFIED = 0;
+  JOIN_TYPE_INNER = 1;
+  JOIN_TYPE_OUTER = 2;
+  JOIN_TYPE_LEFT = 3;
+  JOIN_TYPE_RIGHT = 4;
+  JOIN_TYPE_LEFT_SEMI = 5;
+  JOIN_TYPE_RIGHT_SEMI = 6;
+  JOIN_TYPE_LEFT_ANTI = 7;
+  JOIN_TYPE_RIGHT_ANTI = 8;
+  JOIN_TYPE_LEFT_SINGLE = 9;
+  JOIN_TYPE_RIGHT_SINGLE = 10;
+  JOIN_TYPE_LEFT_MARK = 11;
+  JOIN_TYPE_RIGHT_MARK = 12;
+}
+
 // Cartesian product relational operator of two tables (left and right)
 message CrossRel {
   RelCommon common = 1;
@@ -819,22 +819,6 @@ message HashJoinRel {
 
   JoinType type = 7;
 
-  enum JoinType {
-    JOIN_TYPE_UNSPECIFIED = 0;
-    JOIN_TYPE_INNER = 1;
-    JOIN_TYPE_OUTER = 2;
-    JOIN_TYPE_LEFT = 3;
-    JOIN_TYPE_RIGHT = 4;
-    JOIN_TYPE_LEFT_SEMI = 5;
-    JOIN_TYPE_RIGHT_SEMI = 6;
-    JOIN_TYPE_LEFT_ANTI = 7;
-    JOIN_TYPE_RIGHT_ANTI = 8;
-    JOIN_TYPE_LEFT_SINGLE = 9;
-    JOIN_TYPE_RIGHT_SINGLE = 10;
-    JOIN_TYPE_LEFT_MARK = 11;
-    JOIN_TYPE_RIGHT_MARK = 12;
-  }
-
   substrait.extensions.AdvancedExtension advanced_extension = 10;
 }
 
@@ -869,22 +853,6 @@ message MergeJoinRel {
 
   JoinType type = 7;
 
-  enum JoinType {
-    JOIN_TYPE_UNSPECIFIED = 0;
-    JOIN_TYPE_INNER = 1;
-    JOIN_TYPE_OUTER = 2;
-    JOIN_TYPE_LEFT = 3;
-    JOIN_TYPE_RIGHT = 4;
-    JOIN_TYPE_LEFT_SEMI = 5;
-    JOIN_TYPE_RIGHT_SEMI = 6;
-    JOIN_TYPE_LEFT_ANTI = 7;
-    JOIN_TYPE_RIGHT_ANTI = 8;
-    JOIN_TYPE_LEFT_SINGLE = 9;
-    JOIN_TYPE_RIGHT_SINGLE = 10;
-    JOIN_TYPE_LEFT_MARK = 11;
-    JOIN_TYPE_RIGHT_MARK = 12;
-  }
-
   substrait.extensions.AdvancedExtension advanced_extension = 10;
 }
 
@@ -899,22 +867,6 @@ message NestedLoopJoinRel {
 
   JoinType type = 5;
 
-  enum JoinType {
-    JOIN_TYPE_UNSPECIFIED = 0;
-    JOIN_TYPE_INNER = 1;
-    JOIN_TYPE_OUTER = 2;
-    JOIN_TYPE_LEFT = 3;
-    JOIN_TYPE_RIGHT = 4;
-    JOIN_TYPE_LEFT_SEMI = 5;
-    JOIN_TYPE_RIGHT_SEMI = 6;
-    JOIN_TYPE_LEFT_ANTI = 7;
-    JOIN_TYPE_RIGHT_ANTI = 8;
-    JOIN_TYPE_LEFT_SINGLE = 9;
-    JOIN_TYPE_RIGHT_SINGLE = 10;
-    JOIN_TYPE_LEFT_MARK = 11;
-    JOIN_TYPE_RIGHT_MARK = 12;
-  }
-
   substrait.extensions.AdvancedExtension advanced_extension = 10;
 }