Bug#31931 Partitions: unjustified 'mix of handlers' error message

Problem was that the mix of handlers was not consistent between
CREATE and ALTER

changed so that it works like:
    - All partitions must use the same engine
      AND it must be the same as the table.
    - if one does NOT specify an engine on the table level
      then one must either NOT specify any engine on any
      partition/subpartition OR for ALL partitions/subpartitions

Note: that after a table have been created, the storage engine
is specified for all parts of the table (table/partition/subpartition)
and so when using alter, one does not need to specify it (unless one
wants to change the storage engine, then one have to specify it on the
table level)


mysql-test/r/partition.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/r/partition_innodb.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/suite/ndb/r/ndb_partition_key.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/suite/ndb/t/ndb_partition_key.test:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test case update
mysql-test/suite/parts/inc/partition_engine.inc:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test case updated
mysql-test/suite/parts/r/ndb_partition_key.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/suite/parts/r/partition_engine_innodb.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/suite/parts/r/partition_engine_myisam.result:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test result updated
mysql-test/suite/parts/t/ndb_partition_key.test:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test case updated
mysql-test/t/partition.test:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test case updated
mysql-test/t/partition_innodb.test:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  test case updated
sql/partition_info.cc:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  moved the check_engine_condition here from sql_partition.cc
  created a new check_engine_mix from check_native_partitioned in
  sql_partition.cc
sql/partition_info.h:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  non static function check_engine_mix (now used in sql_partition.cc)
sql/sql_partition.cc:
  Bug#31931 Partitions: unjustified 'mix of handlers' error message
  moved check_engine_condition to partition_info.cc and moved out some
  common code in check_native_partitioned to check_engine_mix in
  partition_info.cc

2 files changed, 10 insertions, 4 deletions

diff --git a/mysql-test/t/partition.test b/mysql-test/t/partition.test
index 23d6c5f8865..1ba8402cdf0 100644
--- a/mysql-test/t/partition.test
+++ b/mysql-test/t/partition.test
@@ -49,6 +49,7 @@ create table t1 (id int auto_increment, s1 int, primary key (id));
 insert into t1 values (null,1);
 insert into t1 values (null,6);
 
+-- sorted_result
 select * from t1;
 
 alter table t1 partition by range (id) (
@@ -618,12 +619,14 @@ partition by key (a)
 (partition p0, partition p1);
 show create table t1;
 
---error ER_MIX_HANDLER_ERROR
+# Since alter, it already have ENGINE=HEAP from before on table level
+# -> OK
 alter table t1
 partition by key(a)
 (partition p0, partition p1 engine=heap);
 
---error ER_MIX_HANDLER_ERROR
+# Since alter, it already have ENGINE=HEAP from before on table level
+# -> OK
 alter table t1
 partition by key(a)
 (partition p0 engine=heap, partition p1);
diff --git a/mysql-test/t/partition_innodb.test b/mysql-test/t/partition_innodb.test
index 58010f85ecf..5445be6019e 100644
--- a/mysql-test/t/partition_innodb.test
+++ b/mysql-test/t/partition_innodb.test
@@ -86,6 +86,7 @@ engine = innodb
 partition by list (a)
 (partition p0 values in (0));
 
+-- error ER_MIX_HANDLER_ERROR
 alter table t1 engine = x;
 show create table t1;
 drop table t1;
@@ -164,8 +165,10 @@ DROP TABLE t1;
 create table t1 (int_column int, char_column char(5))
   PARTITION BY RANGE (int_column) subpartition by key (char_column) subpartitions 2
   (PARTITION p1 VALUES LESS THAN (5) ENGINE = InnoDB);
-alter table t1 PARTITION BY RANGE (int_column)
+alter table t1
+ENGINE = MyISAM
+PARTITION BY RANGE (int_column)
    subpartition by key (char_column) subpartitions 2
-  (PARTITION p1 VALUES LESS THAN (5) ENGINE = myisam);
+  (PARTITION p1 VALUES LESS THAN (5));
 show create table t1;
 drop table t1;