[improvement](nereids) improve show frontends so slow issue when we don't enable fqdn mode in fe.conf because of using dns resolve firstly but not ip directly (#62139)

### What problem does this PR solve?

improve show frontends so slow issue when we don't enable fqdn mode in
fe.conf because of using dns resolve firstly but not ip directly

Author: heguanhui

fe/fe-core/src/main/java/org/apache/doris/common/proc/FrontendsProcNode.java

@@ -204,35 +204,37 @@ private static boolean isHelperNode(List<HostInfo> helperNodes, Frontend fe) {
     }
 
     private static boolean isJoin(List<InetSocketAddress> allFeHosts, Frontend fe) {
+        String feHost = fe.getHost();
+        int fePort = fe.getEditLogPort();
         for (InetSocketAddress addr : allFeHosts) {
-            if (fe.getEditLogPort() != addr.getPort()) {
+            if (fePort != addr.getPort()) {
                 continue;
             }
-            // if hostname of InetSocketAddress is ip, addr.getHostName() may be not equal to fe.getIp()
-            // so we need to compare fe.getIp() with address.getHostAddress()
-            InetAddress address = addr.getAddress();
-            if (null == address) {
-                LOG.warn("Failed to get InetAddress {}", addr);
-                continue;
-            }
-            if (fe.getHost().equals(address.getHostAddress())) {
-                return true;
-            }
-        }
-
-        // Avoid calling getHostName multiple times, don't remove it
-        for (InetSocketAddress addr : allFeHosts) {
-            // Avoid calling getHostName multiple times, don't remove it
-            if (fe.getEditLogPort() != addr.getPort()) {
-                continue;
-            }
-            // https://bugs.openjdk.org/browse/JDK-8143378#:~:text=getHostName()%3B%20takes%20about%205,millisecond%20on%20JDK%20update%2051
-            // getHostName sometime has bug, take 5s
-            String host = addr.getHostName();
-            if (!Strings.isNullOrEmpty(host)) {
-                if (host.equals(fe.getHost())) {
+            if (Config.enable_fqdn_mode) {
+                String hostName = addr.getHostName();
+                if (!Strings.isNullOrEmpty(hostName) && hostName.equals(feHost)) {
+                    return true;
+                }
+                InetAddress address = addr.getAddress();
+                if (address != null && feHost.equals(address.getHostAddress())) {
                     return true;
                 }
+                if (address == null && !Strings.isNullOrEmpty(hostName) && hostName.equals(feHost)) {
+                    return true;
+                }
+            } else {
+                InetAddress address = addr.getAddress();
+                if (address != null) {
+                    String addrIp = address.getHostAddress();
+                    if (feHost.equals(addrIp)) {
+                        return true;
+                    }
+                } else {
+                    String hostName = addr.getHostName();
+                    if (!Strings.isNullOrEmpty(hostName) && hostName.equals(feHost)) {
+                        return true;
+                    }
+                }
             }
         }
         return false;