diff --git a/contrib/dolphin/expected/operator_associativity.out b/contrib/dolphin/expected/operator_associativity.out
new file mode 100644
index 0000000000000000000000000000000000000000..413cdb43c63af5c4769ef419f1638714db96734a
--- /dev/null
+++ b/contrib/dolphin/expected/operator_associativity.out
@@ -0,0 +1,107 @@
+create table test_op_associativity(a int);
+insert into test_op_associativity values (12);
+insert into test_op_associativity values (12);
+set dolphin.sql_mode = '';
+select * from test_op_associativity where (length(a) > 1 || length(a) >1);
+ a  
+----
+ 12
+ 12
+(2 rows)
+
+set dolphin.sql_mode = 'pipes_as_concat';
+select * from test_op_associativity where (length(a) > 1 || length(a) >1);
+ a 
+---
+(0 rows)
+
+select 1 < 2 < 3;
+ ?column? 
+----------
+ t
+(1 row)
+
+select 2 < 1 < 3;
+ ?column? 
+----------
+ t
+(1 row)
+
+select 2 < (1 < 3);
+ ?column? 
+----------
+ f
+(1 row)
+
+select 3 > 2 > 1;
+ ?column? 
+----------
+ f
+(1 row)
+
+select -2 > -3 > 0;
+ ?column? 
+----------
+ t
+(1 row)
+
+select -2 > (-3 > 0);
+ ?column? 
+----------
+ f
+(1 row)
+
+select 1 <= 2 <= 2;
+ ?column? 
+----------
+ t
+(1 row)
+
+select 2 <= 1 <= 2;
+ ?column? 
+----------
+ t
+(1 row)
+
+select 2 <= (1 <= 2);
+ ?column? 
+----------
+ f
+(1 row)
+
+select 3 >= 2 >= 1;
+ ?column? 
+----------
+ t
+(1 row)
+
+select -2 >= -3 >= 0;
+ ?column? 
+----------
+ t
+(1 row)
+
+select -2 >= (-3 >= 0);
+ ?column? 
+----------
+ f
+(1 row)
+
+select 1 != 1 != 1;
+ ?column? 
+----------
+ t
+(1 row)
+
+select 1 != 0 != 1;
+ ?column? 
+----------
+ f
+(1 row)
+
+select 2 != 1 != 0;
+ ?column? 
+----------
+ t
+(1 row)
+
diff --git a/contrib/dolphin/parallel_schedule_dolphin b/contrib/dolphin/parallel_schedule_dolphin
index 5e4b7dd3d20a9e81be5a00bea77c7b0684190506..11be232b3dcd8c1cf5ab35eff4e5a4f83e5bb7b1 100644
--- a/contrib/dolphin/parallel_schedule_dolphin
+++ b/contrib/dolphin/parallel_schedule_dolphin
@@ -140,7 +140,7 @@ test: test_uuid_short test_sleep distinct dual_test fulltext_index test_text2boo
 
 test: operator_compatibility_test/numeric_operator_test_normal operator_compatibility_test/numeric_operator_test_min operator_compatibility_test/numeric_operator_test_max operator_compatibility_test/time_operator_test operator_compatibility_test/string_operator_test operator_compatibility_test/multi_type_operator_test
 
-test: test_show_status pad_char_to_full_length timestamp_test test_mediumtext ai sqlmode_strict
+test: test_show_status pad_char_to_full_length timestamp_test test_mediumtext ai sqlmode_strict operator_associativity
 
 # lock tables
 test: lock_tables lock_tables_1
diff --git a/contrib/dolphin/plugin_parser/gram.y b/contrib/dolphin/plugin_parser/gram.y
index 7927cfbbf8025c518e5f2d4e8ddbdb8650eb3407..dd804498eac4f8a937b8f76513594bf3a194853c 100644
--- a/contrib/dolphin/plugin_parser/gram.y
+++ b/contrib/dolphin/plugin_parser/gram.y
@@ -1291,7 +1291,8 @@ static inline void ChangeBpcharCastType(TypeName* typname);
 %left		AND
 %right		NOT
 %right		'=' CmpNullOp COLON_EQUALS
-%nonassoc	'<' '>' CmpOp BINARY
+%left		'<' '>' CmpOp
+%nonassoc	BINARY
 %nonassoc	LIKE ILIKE SIMILAR SOUNDS NOT_LIKE NOT_ILIKE NOT_SIMILAR
 %nonassoc	ESCAPE
 %nonassoc	OVERLAPS
diff --git a/contrib/dolphin/sql/operator_associativity.sql b/contrib/dolphin/sql/operator_associativity.sql
new file mode 100644
index 0000000000000000000000000000000000000000..a055636b14d23c72f2cc0ec2200fe2f6f7b5ce5d
--- /dev/null
+++ b/contrib/dolphin/sql/operator_associativity.sql
@@ -0,0 +1,29 @@
+create table test_op_associativity(a int);
+insert into test_op_associativity values (12);
+insert into test_op_associativity values (12);
+
+set dolphin.sql_mode = '';
+select * from test_op_associativity where (length(a) > 1 || length(a) >1);
+
+set dolphin.sql_mode = 'pipes_as_concat';
+select * from test_op_associativity where (length(a) > 1 || length(a) >1);
+
+select 1 < 2 < 3;
+select 2 < 1 < 3;
+select 2 < (1 < 3);
+
+select 3 > 2 > 1;
+select -2 > -3 > 0;
+select -2 > (-3 > 0);
+
+select 1 <= 2 <= 2;
+select 2 <= 1 <= 2;
+select 2 <= (1 <= 2);
+
+select 3 >= 2 >= 1;
+select -2 >= -3 >= 0;
+select -2 >= (-3 >= 0);
+
+select 1 != 1 != 1;
+select 1 != 0 != 1;
+select 2 != 1 != 0;