Bug #12876932 - INCORRECT SELECT RESULT ON FEDERATED TABLE

Problem description:
Table 't' created with two colums having compound index on both the 
columns under innodb/myisam engine at remote machine. In the local 
machine same table is created undet the federated engine.
A select having where clause with along 'AND' operation gives wrong 
results on local machine.

Analysis: 
The given query at federated engine is wrongly transformed by 
federated::create_where_from_key() function and the same was sent to 
the remote machine. Hence the local machine is showing wrong results.

Given query "select c1 from t where c1 <= 2 and c2 = 1;"
Query transformed, after ha_federated::create_where_from_key() function is:
SELECT `c1`, `c2` FROM `t` WHERE  (`c1` IS NOT NULL ) AND 
( (`c1` >= 2)  AND  (`c2` <= 1) ) and the same sent to real_query().
In the above the '<=' and '=' conditions were transformed to '>=' and 
'<=' respectively.

ha_federated::create_where_from_key() function behaving as below:
The key_range is having both the start_key and end_key. The start_key 
is used to get "(`c1` IS NOT NULL )" part of the where clause, this 
transformation is correct. The end_key is used to get "( (`c1` >= 2) 
AND  (`c2` <= 1) )", which is wrong, here the given conditions('<=' and '=') 
are changed as wrong conditions('>=' and '<=').
The end_key is having {key = 0x39fa6d0 "", length = 10, keypart_map = 3, 
flag = HA_READ_AFTER_KEY}

The store_length is having value '5'. Based on store_length and length 
values the condition values is applied in HA_READ_AFTER_KEY switch case.
The switch case 'HA_READ_AFTER_KEY' is applicable to only the last part of 
the end_key and for previous parts it is going to 'HA_READ_KEY_OR_NEXT' case, 
here the '>=' is getting added as a condition instead of '<='.

Fix:
Updated the 'if' condition in 'HA_READ_AFTER_KEY' case to affect for all 
parts of the end_key. i.e 'i > 0' will used for end_key, Hence added it in 
the if condition.


mysql-test/suite/federated/federated.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_archive.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_bug_13118.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_bug_25714.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_bug_35333.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_debug.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_innodb.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_server.test:
  modified the federated.inc file location
mysql-test/suite/federated/federated_transactions.test:
  modified the federated.inc file location
mysql-test/suite/federated/include/federated.inc:
  moved the file from federated suite to federated/include folder
mysql-test/suite/federated/include/federated_cleanup.inc:
  moved the file from federated suite to federated/include folder
mysql-test/suite/federated/include/have_federated_db.inc:
  moved the file from federated suite to federated/include folder
storage/federated/ha_federated.cc:
  updated the 'if condition' in ha_federated::create_where_from_key() 
  function.

mysql-test/suite/federated/federated.test

@@ -6,7 +6,7 @@
 
 # should work with embedded server after mysqltest is fixed
 --source include/not_embedded.inc
---source federated.inc
+--source suite/federated/include/federated.inc
 
 connection default;
 
@@ -1999,4 +1999,4 @@ connection slave;
 SET @@GLOBAL.CONCURRENT_INSERT= @OLD_SLAVE_CONCURRENT_INSERT;
 
 connection default;
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated_archive.test

 source include/have_archive.inc;
-source federated.inc;
+source suite/federated/include/federated.inc;
 
 
 connection slave;
@@ -54,5 +54,5 @@ connection slave;
 DROP TABLE federated.archive_table;
 
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;
 

mysql-test/suite/federated/federated_bug_13118.test

-source federated.inc;
+source suite/federated/include/federated.inc;
 
 connection slave;
 --disable_warnings
@@ -37,5 +37,5 @@ connection slave;
 DROP TABLE federated.bug_13118_table;
 
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;
 

mysql-test/suite/federated/federated_bug_25714.test

@@ -4,7 +4,7 @@ if (`select LENGTH("$MYSQL_BUG25714") = 0`)
   skip Need bug25714 test program;
 }
 
-source federated.inc;
+source suite/federated/include/federated.inc;
 
 connection master;
 # Disable concurrent inserts to avoid test failures when reading
@@ -59,4 +59,4 @@ SET @@GLOBAL.CONCURRENT_INSERT= @OLD_SLAVE_CONCURRENT_INSERT;
 
 
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated_bug_35333.test

@@ -9,7 +9,7 @@
 --echo # to complete while still indicating a problem. This fix applies to any non-fatal system
 --echo # error that occurs during a query against I_S.TABLES.de
 
---source federated.inc
+--source suite/federated/include/federated.inc
 
 --disable_warnings
 CREATE DATABASE IF NOT EXISTS realdb;
@@ -71,4 +71,4 @@ DROP TABLE IF EXISTS federated.t0;
 DROP DATABASE realdb;
 --enable_warnings
 
---source federated_cleanup.inc
+--source suite/federated/include/federated_cleanup.inc

mysql-test/suite/federated/federated_debug.test

 --source include/have_debug.inc
---source federated.inc
+--source suite/federated/include/federated.inc
 
 --echo #
 --echo # Bug#47525: MySQL crashed (Federated)
@@ -36,4 +36,4 @@ DROP TABLE t1;
 
 connection default;
 --echo # Federated cleanup
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated_innodb.test

@@ -4,7 +4,7 @@
 # See Bug #40645 Test main.federated_innodb does not always clean up after itself
 
 source include/have_innodb.inc;
-source federated.inc;
+source suite/federated/include/federated.inc;
 
 #
 # Bug#25513 Federated transaction failures
@@ -36,4 +36,4 @@ connection slave;
 drop table federated.t1;
 
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated_server.test

 # WL #3031 This test tests the new servers table as well as
 # if federated can utilise the servers table
--- source federated.inc
+-- source suite/federated/include/federated.inc
 
 connection slave;
 create database first_db;
@@ -333,4 +333,4 @@ drop procedure p1;
 drop server if exists s;
 
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated_transactions.test

 source include/have_innodb.inc;
-source federated.inc;
+source suite/federated/include/federated.inc;
 
 connection slave;
 DROP TABLE IF EXISTS federated.t1;
@@ -35,4 +35,4 @@ INSERT INTO federated.t1 (id, name) VALUES (6, 'fig');
 SELECT * FROM federated.t1;
 DELETE FROM federated.t1;
 
-source federated_cleanup.inc;
+source suite/federated/include/federated_cleanup.inc;

mysql-test/suite/federated/federated.inc → mysql-test/suite/federated/include/federated.inc

 --source include/not_embedded.inc
---source have_federated_db.inc
+--source suite/federated/include/have_federated_db.inc
 
 connect (master,127.0.0.1,root,,test,$MASTER_MYPORT,);
 connect (slave,127.0.0.1,root,,test,$SLAVE_MYPORT,);

mysql-test/t/partition_federated.test

@@ -3,7 +3,7 @@
 #
 -- source include/have_partition.inc
 -- source include/not_embedded.inc
--- source suite/federated/have_federated_db.inc
+-- source suite/federated/include/have_federated_db.inc
 
 --disable_warnings
 drop table if exists t1;

storage/federated/ha_federated.cc

@@ -1364,7 +1364,7 @@ bool ha_federated::create_where_from_key(String *to,
           break;
         }
         DBUG_PRINT("info", ("federated HA_READ_AFTER_KEY %d", i));
-        if (store_length >= length) /* end key */
+        if ((store_length >= length) || (i > 0)) /* for all parts of end key*/
         {
           if (emit_key_part_name(&tmp, key_part))
             goto err;