1
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
4
* Copyright (C) 2008-2009 Sun Microsystems, Inc.
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.
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.
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
20
#ifndef DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H
21
#define DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H
23
#include "drizzled/util/functors.h"
38
Table rows retrieval plan. Range optimizer creates QuickSelectInterface-derived
39
objects from table read plans.
45
Plan read cost, with or without cost of full row retrieval, depending
46
on plan creation parameters.
49
ha_rows records; /* estimate of #rows to be examined */
52
If true, the scan returns rows in rowid order. This is used only for
53
scans that can be both ROR and non-ROR.
58
Create quick select for this plan.
61
param Parameter from test_quick_select
62
retrieve_full_rows If true, created quick select will do full record
64
parent_alloc Memory pool to use, if any.
67
retrieve_full_rows is ignored by some implementations.
73
virtual QuickSelectInterface *make_quick(Parameter *param,
74
bool retrieve_full_rows,
75
memory::Root *parent_alloc= NULL) = 0;
77
/* Table read plans are allocated on memory::Root and are never deleted */
78
static void *operator new(size_t size, memory::Root *mem_root)
80
return (void*) mem_root->alloc_root((uint32_t) size);
83
static void operator delete(void *, size_t)
86
static void operator delete(void *, memory::Root *)
87
{ /* Never called */ }
89
virtual ~TableReadPlan() {} /* Remove gcc warning */
95
Plan for a QuickRangeSelect scan.
96
RangeReadPlan::make_quick ignores retrieve_full_rows parameter because
97
QuickRangeSelect doesn't distinguish between 'index only' scans and full
98
record retrieval scans.
100
class RangeReadPlan : public TableReadPlan
105
SEL_ARG *key; /* set of intervals to be used in "range" method retrieval */
106
uint32_t key_idx; /* key number in Parameter::key */
108
uint32_t mrr_buf_size;
110
RangeReadPlan(SEL_ARG *key_arg, uint32_t idx_arg, uint32_t mrr_flags_arg)
114
mrr_flags(mrr_flags_arg)
116
virtual ~RangeReadPlan() {} /* Remove gcc warning */
118
QuickSelectInterface *make_quick(Parameter *param, bool, memory::Root *parent_alloc);
123
/* Plan for QuickRorIntersectSelect scan. */
124
class RorIntersectReadPlan : public TableReadPlan
128
RorIntersectReadPlan() {} /* Remove gcc warning */
129
virtual ~RorIntersectReadPlan() {} /* Remove gcc warning */
131
QuickSelectInterface *make_quick(Parameter *param,
132
bool retrieve_full_rows,
133
memory::Root *parent_alloc);
135
/* Array of pointers to ROR range scans used in this intersection */
136
RorScanInfo **first_scan;
137
RorScanInfo **last_scan; /* End of the above array */
138
RorScanInfo *cpk_scan; /* Clustered PK scan, if there is one */
140
bool is_covering; /* true if no row retrieval phase is necessary */
141
double index_scan_costs; /* SUM(cost(index_scan)) */
147
Plan for QuickRorUnionSelect scan.
148
QuickRorUnionSelect always retrieves full rows, so retrieve_full_rows
149
is ignored by make_quick.
152
class RorUnionReadPlan : public TableReadPlan
155
RorUnionReadPlan() {} /* Remove gcc warning */
156
virtual ~RorUnionReadPlan() {} /* Remove gcc warning */
157
QuickSelectInterface *make_quick(Parameter *param,
158
bool retrieve_full_rows,
159
memory::Root *parent_alloc);
160
TableReadPlan **first_ror; /* array of ptrs to plans for merged scans */
161
TableReadPlan **last_ror; /* end of the above array */
166
Plan for QuickIndexMergeSelect scan.
167
QuickRorIntersectSelect always retrieves full rows, so retrieve_full_rows
168
is ignored by make_quick.
171
class IndexMergeReadPlan : public TableReadPlan
174
IndexMergeReadPlan() {} /* Remove gcc warning */
175
virtual ~IndexMergeReadPlan() {} /* Remove gcc warning */
176
QuickSelectInterface *make_quick(Parameter *param,
177
bool retrieve_full_rows,
178
memory::Root *parent_alloc);
179
RangeReadPlan **range_scans; /* array of ptrs to plans of merged scans */
180
RangeReadPlan **range_scans_end; /* end of the array */
185
Plan for a QuickGroupMinMaxSelect scan.
188
class GroupMinMaxReadPlan : public TableReadPlan
193
KeyPartInfo *min_max_arg_part;
194
uint32_t group_prefix_len;
195
uint32_t used_key_parts;
196
uint32_t group_key_parts;
199
uint32_t key_infix_len;
200
unsigned char key_infix[MAX_KEY_LENGTH];
201
SEL_TREE *range_tree; /* Represents all range predicates in the query. */
202
SEL_ARG *index_tree; /* The SEL_ARG sub-tree corresponding to index_info. */
203
uint32_t param_idx; /* Index of used key in param->key. */
204
/* Number of records selected by the ranges in index_tree. */
206
ha_rows quick_prefix_records;
209
GroupMinMaxReadPlan(bool have_min_arg,
211
KeyPartInfo *min_max_arg_part_arg,
212
uint32_t group_prefix_len_arg,
213
uint32_t used_key_parts_arg,
214
uint32_t group_key_parts_arg,
215
KeyInfo *index_info_arg,
217
uint32_t key_infix_len_arg,
218
unsigned char *key_infix_arg,
220
SEL_ARG *index_tree_arg,
221
uint32_t param_idx_arg,
222
ha_rows quick_prefix_records_arg)
224
have_min(have_min_arg),
225
have_max(have_max_arg),
226
min_max_arg_part(min_max_arg_part_arg),
227
group_prefix_len(group_prefix_len_arg),
228
used_key_parts(used_key_parts_arg),
229
group_key_parts(group_key_parts_arg),
230
index_info(index_info_arg),
232
key_infix_len(key_infix_len_arg),
233
range_tree(tree_arg),
234
index_tree(index_tree_arg),
235
param_idx(param_idx_arg),
236
quick_prefix_records(quick_prefix_records_arg)
239
memcpy(this->key_infix, key_infix_arg, key_infix_len);
241
virtual ~GroupMinMaxReadPlan() {} /* Remove gcc warning */
243
QuickSelectInterface *make_quick(Parameter *param,
244
bool retrieve_full_rows,
245
memory::Root *parent_alloc);
249
} /* namespace optimizer */
251
} /* namespace drizzled */
253
#endif /* DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H */