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

@@ -7635,6 +7635,22 @@ c1	c2	count(c3)
 2012-03-01 02:00:00	3	1
 DROP PROCEDURE p1;
 # 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	Total_ssl_connections	Max_statement_time_exceeded
+SELECT 1;
+1
+1
+DROP PROCEDURE sp;
 #
 # Bug#12663165 SP DEAD CODE REMOVAL DOESN'T UNDERSTAND CONTINUE HANDLERS
 #

mysql-test/t/sp.test

@@ -9073,6 +9073,15 @@ DROP PROCEDURE p1;
 
 --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;
 
 --echo #
 --echo # Bug#12663165 SP DEAD CODE REMOVAL DOESN'T UNDERSTAND CONTINUE HANDLERS

sql/sp_head.cc

@@ -243,6 +243,7 @@ sp_get_flags_for_command(LEX *lex)
   case SQLCOM_SHOW_EXPLAIN:
   case SQLCOM_SHOW_FIELDS:
   case SQLCOM_SHOW_FUNC_CODE:
+  case SQLCOM_SHOW_GENERIC:
   case SQLCOM_SHOW_GRANTS:
   case SQLCOM_SHOW_ENGINE_STATUS:
   case SQLCOM_SHOW_ENGINE_LOGS:

sql/sql_parse.cc

@@ -2442,15 +2442,14 @@ static bool do_execute_sp(THD *thd, sp_head *sp)
       my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
       return 1;
     }
-    /*
-      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;
   ha_rows select_limit= thd->variables.select_limit;
   thd->variables.select_limit= HA_POS_ERROR;