Bug#29019

  "REPLACE/INSERT IGNORE/UPDATE IGNORE doesn't work"
  Federated does not record neccessary HA_EXTRA flags in order to
  support REPLACE/INSERT IGNORE/UPDATE IGNORE.
  Implement ::extra() to capture flags neccessary for functionality.
New function append_ident() to better escape identifiers consistantly.

mysql-test/r/federated.result

@@ -1843,6 +1843,30 @@ C3A4C3B6C3BCC39F
 D18DD184D184D0B5D0BAD182D0B8D0B2D0BDD183D18E
 drop table federated.t1;
 drop table federated.t1;
+create table federated.t1 (a int primary key, b varchar(64))
+DEFAULT CHARSET=utf8;
+create table federated.t1 (a int primary key, b varchar(64))
+ENGINE=FEDERATED
+connection='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1'
+  DEFAULT CHARSET=utf8;
+insert ignore into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+a	b
+1	Larry
+2	Curly
+truncate federated.t1;
+replace into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+a	b
+1	Moe
+2	Curly
+update ignore federated.t1 set a=a+1;
+select * from federated.t1;
+a	b
+1	Moe
+3	Curly
+drop table federated.t1;
+drop table federated.t1;
 DROP TABLE IF EXISTS federated.t1;
 DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;

mysql-test/t/federated.test

@@ -1576,4 +1576,31 @@ connection slave;
 drop table federated.t1;
 
 
+#
+# BUG#21019 Federated Engine does not support REPLACE/INSERT IGNORE/UPDATE IGNORE
+#
+connection slave;
+create table federated.t1 (a int primary key, b varchar(64))
+  DEFAULT CHARSET=utf8;
+connection master;
+--replace_result $SLAVE_MYPORT SLAVE_PORT
+eval create table federated.t1 (a int primary key, b varchar(64))
+  ENGINE=FEDERATED
+  connection='mysql://root@127.0.0.1:$SLAVE_MYPORT/federated/t1'
+  DEFAULT CHARSET=utf8;
+
+insert ignore into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+
+truncate federated.t1;
+replace into federated.t1 values (1,"Larry"), (2,"Curly"), (1,"Moe");
+select * from federated.t1;
+
+update ignore federated.t1 set a=a+1;
+select * from federated.t1;
+
+drop table federated.t1;
+connection slave;
+drop table federated.t1;
+
 source include/federated_cleanup.inc;

sql/ha_federated.h

@@ -157,6 +157,7 @@ class ha_federated: public handler
   MYSQL_ROW_OFFSET current_position;  // Current position used by ::position()
   int remote_error_number;
   char remote_error_buf[FEDERATED_QUERY_BUFFER_SIZE];
+  bool ignore_duplicates, replace_duplicates;
 
 private:
   /*
@@ -284,6 +285,7 @@ class ha_federated: public handler
   int rnd_pos(byte *buf, byte *pos);                            //required
   void position(const byte *record);                            //required
   int info(uint);                                              //required
+  int extra(ha_extra_function operation);
 
   void update_auto_increment(void);
   int repair(THD* thd, HA_CHECK_OPT* check_opt);