[fix](prepare statement) Not supported such prepared statement if pre…

…pare a forward master sql (apache#26512) (apache#26638)

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

@@ -519,6 +519,9 @@ private void executeByNereids(TUniqueId queryId) throws Exception {
  if (logicalPlan instanceof Forward) {
  redirectStatus = ((Forward) logicalPlan).toRedirectStatus();
  if (isForwardToMaster()) {
+ if (context.getCommand() == MysqlCommand.COM_STMT_PREPARE) {
+ throw new UserException("Forward master command is not supported for prepare statement");
+ }
  if (isProxy) {
  // This is already a stmt forwarded from other FE.
  // If we goes here, means we can't find a valid Master FE(some error happens).
@@ -686,6 +689,9 @@ public void executeByLegacy(TUniqueId queryId) throws Exception {
  queryAnalysisSpan.end();
  }
  if (isForwardToMaster()) {
+ if (context.getCommand() == MysqlCommand.COM_STMT_PREPARE) {
+ throw new UserException("Forward master command is not supported for prepare statement");
+ }
  if (isProxy) {
  // This is already a stmt forwarded from other FE.
  // If goes here, which means we can't find a valid Master FE(some error happens).