diff --git a/src/common/backend/utils/adt/name.cpp b/src/common/backend/utils/adt/name.cpp
index fc5a00e7e5c3d741e935bdbe0ea1d34b5a45d1f7..7808e45e831b9081b495cac053bb3d240674f035 100644
--- a/src/common/backend/utils/adt/name.cpp
+++ b/src/common/backend/utils/adt/name.cpp
@@ -211,6 +211,17 @@ int namestrcmp(Name name, const char* str)
     return strncmp(NameStr(*name), str, NAMEDATALEN);
 }
 
+int namestrcasecmp(Name name, const char* str)
+{
+    if (name == NULL && str == NULL)
+        return 0;
+    if (name == NULL)
+        return -1; /* NULL < anything */
+    if (str == NULL)
+        return 1; /* NULL < anything */
+    return strncasecmp(NameStr(*name), str, NAMEDATALEN);
+}
+
 /*
  * SQL-functions CURRENT_USER, SESSION_USER
  */
diff --git a/src/gausskernel/runtime/executor/spi.cpp b/src/gausskernel/runtime/executor/spi.cpp
index 7bcf89fa7d2c69b5f39e3f70d10786934d0e1e31..52c09e58b62e951fc5fd3475f613b9a32fe823c7 100644
--- a/src/gausskernel/runtime/executor/spi.cpp
+++ b/src/gausskernel/runtime/executor/spi.cpp
@@ -1289,7 +1289,11 @@ int SPI_fnumber(TupleDesc tupdesc, const char *fname)
     Form_pg_attribute sys_att;
 
     for (res = 0; res < tupdesc->natts; res++) {
-        if (namestrcmp(&tupdesc->attrs[res].attname, fname) == 0) {
+        if (u_sess->attr.attr_sql.dolphin) {
+            if (namestrcasecmp(&tupdesc->attrs[res].attname, fname) == 0) {
+                return res + 1;
+            }
+        } else if (namestrcmp(&tupdesc->attrs[res].attname, fname) == 0) {
             return res + 1;
         }
     }
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h
index 5f6d9ff1bbcc653f0f48366350eedc1667c9e350..b84ac06c4f9d5f23de33aae441c1a9d2851965d5 100644
--- a/src/include/utils/builtins.h
+++ b/src/include/utils/builtins.h
@@ -447,6 +447,7 @@ extern Datum namegt(PG_FUNCTION_ARGS);
 extern Datum namege(PG_FUNCTION_ARGS);
 extern int namestrcpy(Name name, const char* str);
 extern int namestrcmp(Name name, const char* str);
+extern int namestrcasecmp(Name name, const char* str);
 extern Datum current_user(PG_FUNCTION_ARGS);
 extern Datum session_user(PG_FUNCTION_ARGS);
 extern Datum current_schema(PG_FUNCTION_ARGS);