diff --git a/src/common/backend/utils/misc/guc/guc_sql.cpp b/src/common/backend/utils/misc/guc/guc_sql.cpp
index eeb0c890f..c93ebfd88 100755
--- a/src/common/backend/utils/misc/guc/guc_sql.cpp
+++ b/src/common/backend/utils/misc/guc/guc_sql.cpp
@@ -179,6 +179,7 @@ static bool check_b_format_behavior_compat_options(char **newval, void **extra,
 static void assign_b_format_behavior_compat_options(const char *newval, void *extra);
 static bool check_behavior_compat_options(char** newval, void** extra, GucSource source);
 static void assign_behavior_compat_options(const char* newval, void* extra);
+static const char* show_behavior_compat_options(void);
 static bool check_plsql_compile_behavior_compat_options(char** newval, void** extra, GucSource source);
 static void assign_plsql_compile_behavior_compat_options(const char* newval, void* extra);
 static void assign_connection_info(const char* newval, void* extra);
@@ -2919,7 +2920,7 @@ static void InitSqlConfigureNamesString()
             "",
             check_behavior_compat_options,
             assign_behavior_compat_options,
-            NULL},
+            show_behavior_compat_options},
         {{"disable_keyword_options",
           PGC_USERSET,
           NODE_ALL,
@@ -3705,6 +3706,43 @@ static void assign_behavior_compat_options(const char* newval, void* extra)
     u_sess->utils_cxt.behavior_compat_flags = result;
 }
 
+static const char* show_behavior_compat_options(void)
+{
+    char *rawstring = NULL;
+    List *elemlist = NULL;
+    ListCell *cell = NULL;
+    int start = 0;
+    int64 result = 0;
+    StringInfoData strInfo;
+    bool isFirst = true;
+    initStringInfo(&strInfo);
+
+    rawstring = pstrdup(u_sess->attr.attr_sql.behavior_compat_string);
+    (void)SplitIdentifierString(rawstring, ',', &elemlist);
+
+    foreach (cell, elemlist) {
+        for (start = 0; start < OPT_MAX; start++) {
+            const char *item = (const char*)lfirst(cell);
+
+            if (strcmp(item, behavior_compat_options[start].name) == 0
+                && (result & behavior_compat_options[start].flag) == 0) {
+                result += behavior_compat_options[start].flag;
+                if (isFirst) {
+                    isFirst = false;
+                    appendStringInfo(&strInfo, "%s", item);
+                } else {
+                    appendStringInfo(&strInfo, ",%s", item);
+                }
+            }
+        }
+    }
+
+    pfree(rawstring);
+    list_free(elemlist);
+
+    return (const char *)strInfo.data;
+}
+
 typedef int16 (*getIgnoreKeywordTokenHook)(const char *item);
 
 static int get_ignore_keyword_token(const char *item)
diff --git a/src/test/regress/expected/numeric_hide_tailing_zero.out b/src/test/regress/expected/numeric_hide_tailing_zero.out
index 2b619fad3..80c3cc14c 100644
--- a/src/test/regress/expected/numeric_hide_tailing_zero.out
+++ b/src/test/regress/expected/numeric_hide_tailing_zero.out
@@ -31,7 +31,58 @@ select cast(123.123 as numeric(15,10));
  123.123
 (1 row)
 
+show behavior_compat_options;
+ behavior_compat_options 
+-------------------------
+ hide_tailing_zero
+(1 row)
+
+set behavior_compat_options='hide_tailing_zero,hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero';
+show behavior_compat_options;
+                      behavior_compat_options                      
+-------------------------------------------------------------------
+ hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero
+(1 row)
+
+select cast(123.123 as numeric(15,10));
+ numeric 
+---------
+ 123.123
+(1 row)
+
+set behavior_compat_options='hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero,display_leading_zero,correct_to_number';
+show behavior_compat_options;
+                               behavior_compat_options                               
+-------------------------------------------------------------------------------------
+ hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero,correct_to_number
+(1 row)
+
+select cast(123.123 as numeric(15,10));
+ numeric 
+---------
+ 123.123
+(1 row)
+
+set behavior_compat_options='truncate_numeric_tail_zero,truncate_numeric_tail_zero, hide_tailing_zero,hide_tailing_zero,hide_tailing_zero, truncate_numeric_tail_zero,hide_tailing_zero';
+show behavior_compat_options;
+           behavior_compat_options            
+----------------------------------------------
+ truncate_numeric_tail_zero,hide_tailing_zero
+(1 row)
+
+select cast(123.123 as numeric(15,10));
+ numeric 
+---------
+ 123.123
+(1 row)
+
 set behavior_compat_options='';
+show behavior_compat_options;
+ behavior_compat_options 
+-------------------------
+ 
+(1 row)
+
 set behavior_compat_options='truncate_numeric_tail_zero';
 create table test_num_zero (a number,b int);
 insert into test_num_zero values(0.1000, 1);
diff --git a/src/test/regress/sql/numeric_hide_tailing_zero.sql b/src/test/regress/sql/numeric_hide_tailing_zero.sql
index 63c16e5ec..b52e5d345 100644
--- a/src/test/regress/sql/numeric_hide_tailing_zero.sql
+++ b/src/test/regress/sql/numeric_hide_tailing_zero.sql
@@ -6,7 +6,18 @@ select cast(0 as numeric(15,10));
 select cast(009.0000 as numeric(15,10));
 set behavior_compat_options='hide_tailing_zero,hide_tailing_zero';
 select cast(123.123 as numeric(15,10));
+show behavior_compat_options;
+set behavior_compat_options='hide_tailing_zero,hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero';
+show behavior_compat_options;
+select cast(123.123 as numeric(15,10));
+set behavior_compat_options='hide_tailing_zero,truncate_numeric_tail_zero,display_leading_zero,display_leading_zero,correct_to_number';
+show behavior_compat_options;
+select cast(123.123 as numeric(15,10));
+set behavior_compat_options='truncate_numeric_tail_zero,truncate_numeric_tail_zero, hide_tailing_zero,hide_tailing_zero,hide_tailing_zero, truncate_numeric_tail_zero,hide_tailing_zero';
+show behavior_compat_options;
+select cast(123.123 as numeric(15,10));
 set behavior_compat_options='';
+show behavior_compat_options;
 
 set behavior_compat_options='truncate_numeric_tail_zero';
 create table test_num_zero (a number,b int);