[fix](row-policy) fix creating row policy with forward issue (#23801)

The `CreateRowPolicyCommand` is implemented with overriding `run()` method.

So when executing `create row policy` in non-master FE, and forward it to Master FE,
it will call `execute(TUniqueId queryId)` method and go through `executeByNereids()`.
And because without `run()` method, it will do nothing and return OK.
So after `show row policy`, user will get empty result.

This PR fix it by implmenting the `run()` method but throw an Exception, so that it will
fallback to old planner, to do the creating row policy command normally.

The full implement of `run()` method should be implemented later.
This is just a tmp fix.

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/CreatePolicyCommand.java

@@ -18,11 +18,14 @@
 package org.apache.doris.nereids.trees.plans.commands;
 
 import org.apache.doris.analysis.UserIdentity;
+import org.apache.doris.nereids.exceptions.AnalysisException;
 import org.apache.doris.nereids.trees.expressions.Expression;
 import org.apache.doris.nereids.trees.plans.PlanType;
 import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
 import org.apache.doris.policy.FilterType;
 import org.apache.doris.policy.PolicyTypeEnum;
+import org.apache.doris.qe.ConnectContext;
+import org.apache.doris.qe.StmtExecutor;
 
 import java.util.List;
 import java.util.Map;
@@ -73,4 +76,10 @@ public class CreatePolicyCommand extends Command implements ForwardWithSync {
     public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
         return visitor.visitCreatePolicyCommand(this, context);
     }
+
+    @Override
+    public void run(ConnectContext ctx, StmtExecutor executor) throws Exception {
+        throw new AnalysisException("Not support create policy command in Nereids now");
+    }
 }
+

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

@@ -56,7 +56,6 @@ import org.apache.doris.nereids.glue.LogicalPlanAdapter;
 import org.apache.doris.nereids.minidump.MinidumpUtils;
 import org.apache.doris.nereids.parser.NereidsParser;
 import org.apache.doris.nereids.stats.StatsErrorEstimator;
-import org.apache.doris.nereids.trees.plans.commands.CreatePolicyCommand;
 import org.apache.doris.plugin.AuditEvent.EventType;
 import org.apache.doris.proto.Data;
 import org.apache.doris.qe.QueryState.MysqlStateType;
@@ -387,14 +386,6 @@ public class ConnectProcessor {
         if (mysqlCommand == MysqlCommand.COM_QUERY && ctx.getSessionVariable().isEnableNereidsPlanner()) {
             try {
                 stmts = new NereidsParser().parseSQL(originStmt);
-                for (StatementBase stmt : stmts) {
-                    LogicalPlanAdapter logicalPlanAdapter = (LogicalPlanAdapter) stmt;
-                    // TODO: remove this after we could process CreatePolicyCommand
-                    if (logicalPlanAdapter.getLogicalPlan() instanceof CreatePolicyCommand) {
-                        stmts = null;
-                        break;
-                    }
-                }
             } catch (Exception e) {
                 // TODO: We should catch all exception here until we support all query syntax.
                 LOG.debug("Nereids parse sql failed. Reason: {}. Statement: \"{}\".",
@@ -848,3 +839,4 @@ public class ConnectProcessor {
     }
 }
 
+