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partition_element.h
1 #ifndef PARTITION_ELEMENT_INCLUDED
2 #define PARTITION_ELEMENT_INCLUDED
3 
4 /* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation; version 2 of the License.
9 
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License
16  along with this program; if not, write to the Free Software
17  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
18 
19 #include "my_base.h" /* ha_rows */
20 #include "handler.h" /* UNDEF_NODEGROUP */
21 
25 enum partition_type {
26  NOT_A_PARTITION= 0,
27  RANGE_PARTITION,
28  HASH_PARTITION,
29  LIST_PARTITION
30 };
31 
32 enum partition_state {
33  PART_NORMAL= 0,
34  PART_IS_DROPPED= 1,
35  PART_TO_BE_DROPPED= 2,
36  PART_TO_BE_ADDED= 3,
37  PART_TO_BE_REORGED= 4,
38  PART_REORGED_DROPPED= 5,
39  PART_CHANGED= 6,
40  PART_IS_CHANGED= 7,
41  PART_IS_ADDED= 8,
42  PART_ADMIN= 9
43 };
44 
45 /*
46  This struct is used to keep track of column expressions as part
47  of the COLUMNS concept in conjunction with RANGE and LIST partitioning.
48  The value can be either of MINVALUE, MAXVALUE and an expression that
49  must be constant and evaluate to the same type as the column it
50  represents.
51 
52  The data in this fixed in two steps. The parser will only fill in whether
53  it is a max_value or provide an expression. Filling in
54  column_value, part_info, partition_id, null_value is done by the
55  function fix_column_value_function. However the item tree needs
56  fixed also before writing it into the frm file (in add_column_list_values).
57  To distinguish between those two variants, fixed= 1 after the
58  fixing in add_column_list_values and fixed= 2 otherwise. This is
59  since the fixing in add_column_list_values isn't a complete fixing.
60 */
61 
62 typedef struct p_column_list_val
63 {
64  void* column_value;
65  Item* item_expression;
66  partition_info *part_info;
67  uint partition_id;
68  bool max_value;
69  bool null_value;
70  char fixed;
71 } part_column_list_val;
72 
73 
74 /*
75  This struct is used to contain the value of an element
76  in the VALUES IN struct. It needs to keep knowledge of
77  whether it is a signed/unsigned value and whether it is
78  NULL or not.
79 */
80 
81 typedef struct p_elem_val
82 {
83  longlong value;
84  uint added_items;
85  bool null_value;
86  bool unsigned_flag;
87  part_column_list_val *col_val_array;
88 } part_elem_value;
89 
90 struct st_ddl_log_memory_entry;
91 
92 class partition_element :public Sql_alloc {
93 public:
94  List<partition_element> subpartitions;
95  List<part_elem_value> list_val_list; // list of LIST values/column arrays
96  ha_rows part_max_rows;
97  ha_rows part_min_rows;
98  longlong range_value;
99  char *partition_name;
100  char *tablespace_name;
101  struct st_ddl_log_memory_entry *log_entry;
102  char* part_comment;
103  char* data_file_name;
104  char* index_file_name;
105  handlerton *engine_type;
106  enum partition_state part_state;
107  uint16 nodegroup_id;
108  bool has_null_value;
109  bool signed_flag; // Range value signed
110  bool max_value; // MAXVALUE range
111 
112  partition_element()
113  : part_max_rows(0), part_min_rows(0), range_value(0),
114  partition_name(NULL), tablespace_name(NULL),
115  log_entry(NULL), part_comment(NULL),
116  data_file_name(NULL), index_file_name(NULL),
117  engine_type(NULL), part_state(PART_NORMAL),
118  nodegroup_id(UNDEF_NODEGROUP), has_null_value(FALSE),
119  signed_flag(FALSE), max_value(FALSE)
120  {
121  }
122  partition_element(partition_element *part_elem)
123  : part_max_rows(part_elem->part_max_rows),
124  part_min_rows(part_elem->part_min_rows),
125  range_value(0), partition_name(NULL),
126  tablespace_name(part_elem->tablespace_name),
127  part_comment(part_elem->part_comment),
128  data_file_name(part_elem->data_file_name),
129  index_file_name(part_elem->index_file_name),
130  engine_type(part_elem->engine_type),
131  part_state(part_elem->part_state),
132  nodegroup_id(part_elem->nodegroup_id),
133  has_null_value(FALSE)
134  {
135  }
136  ~partition_element() {}
137 };
138 
139 #endif /* PARTITION_ELEMENT_INCLUDED */