WL 2826: Error handling of ALTER TABLE for partitioning

Make lots of fixes to handle the most complex case of reorganising
of partitions where two-phased processes are needed in some cases.


sql/ha_partition.cc:
  Rewrote the rename partitions and drop partitions to align with how
  the table log handles things.
sql/handler.h:
  Added new entry to partition_element to keep track of log entry for
  a partition during ALTER TABLE that reorganises existing partitions.
sql/mysql_priv.h:
  Converted 'd', 'e' and so forth to constants with somewhat more
  descriptive names
  Added method to inactivate log entries
sql/sql_partition.cc:
  Fix change of partitions
sql/sql_table.cc:
  More constants with somewhat descriptive names
  Moved around some methods between internal part and external part
  Added new method to handle inactivation of log entries

1 files changed, 3 insertions, 1 deletions

diff --git a/sql/handler.h b/sql/handler.h
index 00bfaa77e91..b54e7ff129b 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -667,6 +667,7 @@ public:
   ulonglong part_min_rows;
   char *partition_name;
   char *tablespace_name;
+  TABLE_LOG_MEMORY_ENTRY *log_entry;
   longlong range_value;
   char* part_comment;
   char* data_file_name;
@@ -677,7 +678,8 @@ public:
   
   partition_element()
   : part_max_rows(0), part_min_rows(0), partition_name(NULL),
-    tablespace_name(NULL), range_value(0), part_comment(NULL),
+    tablespace_name(NULL), log_entry(0),
+    range_value(0), part_comment(NULL),
     data_file_name(NULL), index_file_name(NULL),
     engine_type(NULL),part_state(PART_NORMAL),
     nodegroup_id(UNDEF_NODEGROUP)