[enhance](*): replace with StringBuild (#11146)

fe/fe-core/src/main/cup/sql_parser.cup

@@ -147,7 +147,7 @@ parser code {:
             return null;
         }
         String[] lines = stmt.split("\n", -1);
-        StringBuffer result = new StringBuffer();
+        StringBuilder result = new StringBuilder();
         result.append(getErrorTypeMessage(errorToken.sym) + " in line ");
         result.append(errorToken.left);
         result.append(":\n");

fe/fe-core/src/main/java/org/apache/doris/analysis/AlterPolicyStmt.java

@@ -139,7 +139,7 @@ public class AlterPolicyStmt extends DdlStmt {
 
     @Override
     public String toSql() {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         sb.append("ALTER POLICY '").append(policyName).append("' ");
         sb.append("PROPERTIES(").append(new PrintableMap<>(properties, " = ", true, false)).append(")");
         return sb.toString();

fe/fe-core/src/main/java/org/apache/doris/analysis/AlterResourceStmt.java

@@ -77,7 +77,7 @@ public class AlterResourceStmt extends DdlStmt {
 
     @Override
     public String toSql() {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         sb.append("ALTER RESOURCE '").append(resourceName).append("' ");
         sb.append("PROPERTIES(").append(new PrintableMap<>(properties, " = ", true, false)).append(")");
         return sb.toString();

fe/fe-core/src/main/java/org/apache/doris/analysis/Separator.java

@@ -101,7 +101,7 @@ public class Separator implements ParseNode {
 
     // unescape some invisible string literal to char, such as "/t" to char '/t'
     private static String unescape(String orig) {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         boolean hadSlash = false;
         for (int i = 0; i < orig.length(); i++) {
             char ch = orig.charAt(i);

fe/fe-core/src/main/java/org/apache/doris/catalog/Replica.java

@@ -431,7 +431,7 @@ public class Replica implements Writable {
 
     @Override
     public String toString() {
-        StringBuffer strBuffer = new StringBuffer("[replicaId=");
+        StringBuilder strBuffer = new StringBuilder("[replicaId=");
         strBuffer.append(id);
         strBuffer.append(", BackendId=");
         strBuffer.append(backendId);

fe/fe-core/src/main/java/org/apache/doris/httpv2/rest/manager/NodeAction.java

@@ -554,7 +554,7 @@ public class NodeAction extends RestBaseController {
     }
 
     private String concatFeSetConfigUrl(NodeConfigs nodeConfigs, boolean isPersist) {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         Pair<String, Integer> hostPort = nodeConfigs.getHostPort();
         sb.append("http://").append(hostPort.first).append(":").append(hostPort.second).append("/api/_set_config");
         Map<String, String> configs = nodeConfigs.getConfigs(isPersist);

fe/fe-core/src/main/java/org/apache/doris/httpv2/util/HttpUtil.java

@@ -17,34 +17,13 @@
 
 package org.apache.doris.httpv2.util;
 
-import com.google.common.base.Strings;
-import org.springframework.http.HttpHeaders;
-
 import java.io.BufferedReader;
 import java.io.IOException;
 import javax.servlet.http.HttpServletRequest;
 
 public class HttpUtil {
-    public static boolean isKeepAlive(HttpServletRequest request) {
-        if (!request.getHeader(HttpHeaders.CONNECTION).equals("close")
-                && (request.getProtocol().equals("")
-                || request.getHeader(HttpHeaders.CONNECTION).equals("keep-alive"))) {
-            return true;
-        }
-        return false;
-    }
-
-    public static boolean isSslEnable(HttpServletRequest request) {
-        String url = request.getRequestURL().toString();
-        if (!Strings.isNullOrEmpty(url) && url.startsWith("https")) {
-            return true;
-        }
-        return false;
-
-    }
-
     public static String getBody(HttpServletRequest request) {
-        StringBuffer data = new StringBuffer();
+        StringBuilder data = new StringBuilder();
         String line = null;
         BufferedReader reader = null;
         try {

fe/fe-core/src/test/java/org/apache/doris/planner/QueryPlanTest.java

@@ -1018,7 +1018,6 @@ public class QueryPlanTest extends TestWithFeService {
     public void testJoinPredicateTransitivityWithSubqueryInWhereClause() throws Exception {
         connectContext.setDatabase("default_cluster:test");
         String sql = "SELECT *\n"
-
                 + "FROM test.pushdown_test\n"
                 + "WHERE 0 < (\n"
                 + "    SELECT MAX(k9)\n" + "    FROM test.pushdown_test);";
@@ -1037,7 +1036,7 @@ public class QueryPlanTest extends TestWithFeService {
     }
 
     @Test
-    public void testConstInParitionPrune() throws Exception {
+    public void testConstInPartitionPrune() throws Exception {
         FeConstants.runningUnitTest = true;
         String queryStr = "explain select * from (select 'aa' as kk1, sum(id) from test.join1 where dt = 9"
                 + " group by kk1)tt where kk1 in ('aa');";

fe/fe-core/src/test/java/org/apache/doris/planner/RepeatNodeTest.java

@@ -81,7 +81,7 @@ public class RepeatNodeTest {
     }
 
     @Test
-    public void testNornal() {
+    public void testNormal() {
         try {
             TPlanNode msg = new TPlanNode();
             node.toThrift(msg);