[Chore](nereids) Remove DropFunctionStmt

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

@@ -2571,11 +2571,6 @@ drop_stmt ::=
     {:
         RESULT = new DropCatalogStmt(ifExists, catalogName);
     :}
-    /* Function */
-    | KW_DROP opt_var_type:type KW_FUNCTION opt_if_exists:ifExists function_name:functionName LPAREN func_args_def:args RPAREN
-    {:
-        RESULT = new DropFunctionStmt(type, ifExists, functionName, args);
-    :}
     /* Table */
     | KW_DROP KW_TABLE opt_if_exists:ifExists table_name:name opt_force:force
     {:

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

@@ -35,11 +35,9 @@
 import org.apache.doris.analysis.CreateTableStmt;
 import org.apache.doris.analysis.DdlStmt;
 import org.apache.doris.analysis.DistributionDesc;
-import org.apache.doris.analysis.DropFunctionStmt;
 import org.apache.doris.analysis.DropPartitionClause;
 import org.apache.doris.analysis.DropTableStmt;
 import org.apache.doris.analysis.Expr;
-import org.apache.doris.analysis.FunctionName;
 import org.apache.doris.analysis.InstallPluginStmt;
 import org.apache.doris.analysis.ModifyDistributionClause;
 import org.apache.doris.analysis.PartitionRenameClause;
@@ -48,7 +46,6 @@
 import org.apache.doris.analysis.RecoverTableStmt;
 import org.apache.doris.analysis.ReplacePartitionClause;
 import org.apache.doris.analysis.RollupRenameClause;
-import org.apache.doris.analysis.SetType;
 import org.apache.doris.analysis.SlotRef;
 import org.apache.doris.analysis.TableRenameClause;
 import org.apache.doris.analysis.UninstallPluginStmt;
@@ -274,14 +271,12 @@
 import org.apache.doris.statistics.StatisticsCleaner;
 import org.apache.doris.statistics.StatisticsJobAppender;
 import org.apache.doris.statistics.query.QueryStats;
-import org.apache.doris.system.Backend;
 import org.apache.doris.system.Frontend;
 import org.apache.doris.system.HeartbeatMgr;
 import org.apache.doris.system.SystemInfoService;
 import org.apache.doris.system.SystemInfoService.HostInfo;
 import org.apache.doris.task.AgentBatchTask;
 import org.apache.doris.task.AgentTaskExecutor;
-import org.apache.doris.task.CleanUDFCacheTask;
 import org.apache.doris.task.CompactionTask;
 import org.apache.doris.task.MasterTaskExecutor;
 import org.apache.doris.task.PriorityMasterTaskExecutor;
@@ -6571,17 +6566,6 @@ public void replayCreateGlobalFunction(Function function) {
         globalFunctionMgr.replayAddFunction(function);
     }
 
-    public void dropFunction(DropFunctionStmt stmt) throws UserException {
-        FunctionName name = stmt.getFunctionName();
-        if (SetType.GLOBAL.equals(stmt.getType())) {
-            globalFunctionMgr.dropFunction(stmt.getFunction(), stmt.isIfExists());
-        } else {
-            Database db = getInternalCatalog().getDbOrDdlException(name.getDb());
-            db.dropFunction(stmt.getFunction(), stmt.isIfExists());
-        }
-        cleanUDFCacheTask(stmt); // BE will cache classload, when drop function, BE need clear cache
-    }
-
     public void replayDropFunction(FunctionSearchDesc functionSearchDesc) throws MetaNotFoundException {
         String dbName = functionSearchDesc.getName().getDb();
         Database db = getInternalCatalog().getDbOrMetaException(dbName);
@@ -7090,18 +7074,6 @@ public void onErasePartition(Partition partition) {
         getInternalCatalog().erasePartitionDropBackendReplicas(Lists.newArrayList(partition));
     }
 
-    public void cleanUDFCacheTask(DropFunctionStmt stmt) throws UserException {
-        ImmutableMap<Long, Backend> backendsInfo = Env.getCurrentSystemInfo().getAllBackendsByAllCluster();
-        String functionSignature = stmt.signatureString();
-        AgentBatchTask batchTask = new AgentBatchTask();
-        for (Backend backend : backendsInfo.values()) {
-            CleanUDFCacheTask cleanUDFCacheTask = new CleanUDFCacheTask(backend.getId(), functionSignature);
-            batchTask.addTask(cleanUDFCacheTask);
-            LOG.info("clean udf cache in be {}, beId {}", backend.getHost(), backend.getId());
-        }
-        AgentTaskExecutor.submit(batchTask);
-    }
-
     public void setPartitionVersion(AdminSetPartitionVersionStmt stmt) throws DdlException {
         String database = stmt.getDatabase();
         String table = stmt.getTable();

fe/fe-core/src/main/java/org/apache/doris/qe/DdlExecutor.java

@@ -40,7 +40,6 @@
 import org.apache.doris.analysis.CreateWorkloadSchedPolicyStmt;
 import org.apache.doris.analysis.DdlStmt;
 import org.apache.doris.analysis.DropCatalogStmt;
-import org.apache.doris.analysis.DropFunctionStmt;
 import org.apache.doris.analysis.DropIndexPolicyStmt;
 import org.apache.doris.analysis.DropRepositoryStmt;
 import org.apache.doris.analysis.DropSqlBlockRuleStmt;
@@ -87,9 +86,7 @@ public class DdlExecutor {
      **/
     public static void execute(Env env, DdlStmt ddlStmt) throws Exception {
         checkDdlStmtSupported(ddlStmt);
-        if (ddlStmt instanceof DropFunctionStmt) {
-            env.dropFunction((DropFunctionStmt) ddlStmt);
-        } else if (ddlStmt instanceof CreateEncryptKeyStmt) {
+        if (ddlStmt instanceof CreateEncryptKeyStmt) {
             EncryptKeyHelper.createEncryptKey((CreateEncryptKeyStmt) ddlStmt);
         } else if (ddlStmt instanceof CreateTableStmt) {
             env.createTable((CreateTableStmt) ddlStmt);