diff --git a/contrib/dolphin/expected/builtin_funcs/b_compatibility_substr_func.out b/contrib/dolphin/expected/builtin_funcs/b_compatibility_substr_func.out
index 9ab9d002387e0fb06be57ee66ce12d317ca80f79..f74262b1005265b68555d9078083a9e179739efc 100644
--- a/contrib/dolphin/expected/builtin_funcs/b_compatibility_substr_func.out
+++ b/contrib/dolphin/expected/builtin_funcs/b_compatibility_substr_func.out
@@ -588,3 +588,57 @@ reset bytea_output;
 reset dolphin.sql_mode;
 reset dolphin.b_compatibility_mode;
 reset current_schema;
+set dolphin.b_compatibility_mode = off;
+create database db_sqlascii dbcompatibility 'B' encoding='SQL_ASCII' lc_collate='C' lc_ctype='C';
+\c db_sqlascii
+set dolphin.b_compatibility_mode = on;
+select LPAD('abc',2147483647,'abc');
+WARNING:  requested length too large
+CONTEXT:  referenced column: lpad
+ lpad 
+------
+ 
+(1 row)
+
+select LPAD(repeat('abc',1000),2147483647,'abc');
+WARNING:  requested length too large
+CONTEXT:  referenced column: lpad
+ lpad 
+------
+ 
+(1 row)
+
+select LPAD(NULL,2147483647,repeat('abc',1000));
+ lpad 
+------
+ 
+(1 row)
+
+select LPAD('',2147483647,repeat('abc',1000));
+WARNING:  requested length too large
+CONTEXT:  referenced column: lpad
+ lpad 
+------
+ 
+(1 row)
+
+select LPAD('abc',2147483647,repeat('abc',1000));
+WARNING:  requested length too large
+CONTEXT:  referenced column: lpad
+ lpad 
+------
+ 
+(1 row)
+
+select LPAD(repeat('abc',1000),2147483647,repeat('abc',1000));
+WARNING:  requested length too large
+CONTEXT:  referenced column: lpad
+ lpad 
+------
+ 
+(1 row)
+
+\c contrib_regression
+set dolphin.b_compatibility_mode = off;
+drop database db_sqlascii;
+reset dolphin.b_compatibility_mode;
diff --git a/contrib/dolphin/plugin_utils/adt/a_compat.cpp b/contrib/dolphin/plugin_utils/adt/a_compat.cpp
index f7edd516dc0a37a5f31b14a5ed7d1e96c0fb1aee..f4813b3ad1c8687604bb6e4e4439a1103ba6f71b 100644
--- a/contrib/dolphin/plugin_utils/adt/a_compat.cpp
+++ b/contrib/dolphin/plugin_utils/adt/a_compat.cpp
@@ -353,6 +353,7 @@ Datum lpad(PG_FUNCTION_ARGS)
     }
     PG_CATCH();
     {
+        FlushErrorState();
         ereport(level, (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED), errmsg("requested length too large")));
         PG_RETURN_NULL();
     }
diff --git a/contrib/dolphin/sql/builtin_funcs/b_compatibility_substr_func.sql b/contrib/dolphin/sql/builtin_funcs/b_compatibility_substr_func.sql
index 7c00499dcdc0b9d82059ef85d6b3dbf439f6fcf0..fef719ef47f5b0e5cd908d873aaa42f300fc9ec4 100644
--- a/contrib/dolphin/sql/builtin_funcs/b_compatibility_substr_func.sql
+++ b/contrib/dolphin/sql/builtin_funcs/b_compatibility_substr_func.sql
@@ -272,3 +272,20 @@ reset bytea_output;
 reset dolphin.sql_mode;
 reset dolphin.b_compatibility_mode;
 reset current_schema;
+
+set dolphin.b_compatibility_mode = off;
+create database db_sqlascii dbcompatibility 'B' encoding='SQL_ASCII' lc_collate='C' lc_ctype='C';
+\c db_sqlascii
+set dolphin.b_compatibility_mode = on;
+
+select LPAD('abc',2147483647,'abc');
+select LPAD(repeat('abc',1000),2147483647,'abc');
+select LPAD(NULL,2147483647,repeat('abc',1000));
+select LPAD('',2147483647,repeat('abc',1000));
+select LPAD('abc',2147483647,repeat('abc',1000));
+select LPAD(repeat('abc',1000),2147483647,repeat('abc',1000));
+
+\c contrib_regression
+set dolphin.b_compatibility_mode = off;
+drop database db_sqlascii;
+reset dolphin.b_compatibility_mode;