MDEV-17610 Unexpected connection abort after certain operations from within stored procedure

Always set SERVER_MORE_RESULTS_EXIST when executing stored procedure statements

If statements produce a result, EOF packet needs this flag (SP ends
with an OK packet). IF statetement does not produce a result, affected rows
count are part of the final OK packet.

mysql-test/r/sp.result

@@ -8106,3 +8106,19 @@ DROP PROCEDURE sp;
 DROP VIEW v1;
 DROP TABLE t1, t2;
 # End of 5.5 test
+CREATE PROCEDURE sp() ALTER TABLE non_existing_table OPTIMIZE PARTITION p0;
+CALL sp;
+Table	Op	Msg_type	Msg_text
+test.non_existing_table	optimize	Error	Table 'test.non_existing_table' doesn't exist
+test.non_existing_table	optimize	status	Operation failed
+SELECT 1;
+1
+1
+DROP PROCEDURE sp;
+CREATE PROCEDURE sp() SHOW USER_STATISTICS;
+CALL sp;
+User	Total_connections	Concurrent_connections	Connected_time	Busy_time	Cpu_time	Bytes_received	Bytes_sent	Binlog_bytes_written	Rows_read	Rows_sent	Rows_deleted	Rows_inserted	Rows_updated	Select_commands	Update_commands	Other_commands	Commit_transactions	Rollback_transactions	Denied_connections	Lost_connections	Access_denied	Empty_queries
+SELECT 1;
+1
+1
+DROP PROCEDURE sp;

mysql-test/t/sp.test

@@ -9416,3 +9416,13 @@ DROP VIEW v1;
 DROP TABLE t1, t2;
 
 --echo # End of 5.5 test
+
+#MDEV-17610
+CREATE PROCEDURE sp() ALTER TABLE non_existing_table OPTIMIZE PARTITION p0;
+CALL sp;
+SELECT 1;
+DROP PROCEDURE sp;
+CREATE PROCEDURE sp() SHOW USER_STATISTICS;
+CALL sp;
+SELECT 1;
+DROP PROCEDURE sp;

sql/sql_parse.cc

@@ -4088,15 +4088,16 @@ case SQLCOM_PREPARE:
 	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
 	    goto error;
 	  }
-          /*
-            If SERVER_MORE_RESULTS_EXISTS is not set,
-            then remember that it should be cleared
-          */
-	  bits_to_be_cleared= (~thd->server_status &
-                               SERVER_MORE_RESULTS_EXISTS);
-	  thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
 	}
 
+	/*
+	  If SERVER_MORE_RESULTS_EXISTS is not set,
+	  then remember that it should be cleared
+	*/
+	bits_to_be_cleared= (~thd->server_status &
+	                       SERVER_MORE_RESULTS_EXISTS);
+	thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
+
 	if (check_routine_access(thd, EXECUTE_ACL,
 				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
 	{