修复mysql协议下多命令结果错误问题

src/gausskernel/process/tcop/postgres.cpp

@@ -3080,6 +3080,8 @@ static void exec_simple_query(const char* query_string, MessageType messageType,
             CommandCounterIncrement();
         }
 
+        u_sess->proc_cxt.nextQuery = lnext(parsetree_item) != NULL;
+
         /*
          * Tell client that we're done with this query.  Note we emit exactly
          * one EndCommand report for each raw parsetree, thus one for each SQL

src/gausskernel/process/threadpool/knl_session.cpp

@@ -621,6 +621,7 @@ static void knl_u_proc_init(knl_u_proc_context* proc_cxt)
     proc_cxt->sessionBackupState = SESSION_BACKUP_NONE;
     proc_cxt->registerExclusiveHandlerdone = false;
     proc_cxt->check_auth = false;
+    proc_cxt->nextQuery = false;
 }
 
 static void knl_u_time_init(knl_u_time_context* time_cxt)

src/include/knl/knl_session.h

@@ -1258,6 +1258,7 @@ typedef struct knl_u_proc_context {
     char* TblspcMapFile;
     bool  registerAbortBackupHandlerdone;    /* unterminated backups handler flag */
     bool check_auth;
+    bool nextQuery; /* for B-cmpt protocal */
 } knl_u_proc_context;
 
 /* maximum possible number of fields in a date string */