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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008-2009 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H
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#define DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H
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#include "drizzled/util/functors.h"
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struct st_ror_scan_info;
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Table rows retrieval plan. Range optimizer creates QuickSelectInterface-derived
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objects from table read plans.
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Plan read cost, with or without cost of full row retrieval, depending
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on plan creation parameters.
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ha_rows records; /* estimate of #rows to be examined */
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If true, the scan returns rows in rowid order. This is used only for
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scans that can be both ROR and non-ROR.
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Create quick select for this plan.
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param Parameter from test_quick_select
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retrieve_full_rows If true, created quick select will do full record
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parent_alloc Memory pool to use, if any.
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retrieve_full_rows is ignored by some implementations.
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virtual QuickSelectInterface *make_quick(Parameter *param,
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bool retrieve_full_rows,
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memory::Root *parent_alloc= NULL) = 0;
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/* Table read plans are allocated on memory::Root and are never deleted */
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static void *operator new(size_t size, memory::Root *mem_root)
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return (void*) alloc_root(mem_root, (uint32_t) size);
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static void operator delete(void *, size_t)
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static void operator delete(void *, memory::Root *)
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{ /* Never called */ }
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virtual ~TableReadPlan() {} /* Remove gcc warning */
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Plan for a QuickRangeSelect scan.
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RangeReadPlan::make_quick ignores retrieve_full_rows parameter because
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QuickRangeSelect doesn't distinguish between 'index only' scans and full
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record retrieval scans.
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class RangeReadPlan : public TableReadPlan
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RangeReadPlan(SEL_ARG *key_arg, uint32_t idx_arg, uint32_t mrr_flags_arg)
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mrr_flags(mrr_flags_arg),
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virtual ~RangeReadPlan() {} /* Remove gcc warning */
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QuickSelectInterface *make_quick(Parameter *param, bool, memory::Root *parent_alloc);
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void setMRRBufferSize(uint32_t in_mrr_buf_size)
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mrr_buf_size= in_mrr_buf_size;
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uint32_t getKeyIndex() const
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uint32_t getMRRBufferSize() const
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/** set of intervals to be used in "range" method retrieval */
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/** key number in Parameter::key */
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uint32_t mrr_buf_size;
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/* Plan for QuickRorIntersectSelect scan. */
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class RorIntersectReadPlan : public TableReadPlan
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RorIntersectReadPlan()
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index_scan_costs(0.0)
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virtual ~RorIntersectReadPlan()
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std::for_each(ror_range_scans.begin(),
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ror_range_scans.end(),
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ror_range_scans.clear();
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QuickSelectInterface *make_quick(Parameter *param,
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bool retrieve_full_rows,
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memory::Root *parent_alloc);
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void setRowRetrievalNecessary(bool in_is_covering)
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is_covering= in_is_covering;
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void setCostOfIndexScans(double in_index_scan_costs)
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index_scan_costs= in_index_scan_costs;
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* @return true if row retrival phase is necessary.
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bool isRowRetrievalNecessary() const
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return ! is_covering;
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* @return the sum of the cost of each index scan
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double getCostOfIndexScans() const
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return index_scan_costs;
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/** Vector of pointers to ROR range scans used in this intersection */
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std::vector<struct st_ror_scan_info *> ror_range_scans;
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struct st_ror_scan_info *cpk_scan; /* Clustered PK scan, if there is one */
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/** true if no row retrieval phase is necessary */
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/* SUM(cost(index_scan)) */
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double index_scan_costs;
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Plan for QuickRorUnionSelect scan.
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QuickRorUnionSelect always retrieves full rows, so retrieve_full_rows
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is ignored by make_quick.
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class RorUnionReadPlan : public TableReadPlan
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RorUnionReadPlan() {} /* Remove gcc warning */
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virtual ~RorUnionReadPlan() {} /* Remove gcc warning */
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QuickSelectInterface *make_quick(Parameter *param,
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bool retrieve_full_rows,
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memory::Root *parent_alloc);
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/** vector of plans for merged scans */
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std::vector<TableReadPlan *> merged_scans;
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Plan for QuickIndexMergeSelect scan.
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QuickRorIntersectSelect always retrieves full rows, so retrieve_full_rows
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is ignored by make_quick.
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class IndexMergeReadPlan : public TableReadPlan
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IndexMergeReadPlan() {} /* Remove gcc warning */
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virtual ~IndexMergeReadPlan() {} /* Remove gcc warning */
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QuickSelectInterface *make_quick(Parameter *param,
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bool retrieve_full_rows,
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memory::Root *parent_alloc);
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RangeReadPlan **range_scans; /* array of ptrs to plans of merged scans */
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RangeReadPlan **range_scans_end; /* end of the array */
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Plan for a QuickGroupMinMaxSelect scan.
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class GroupMinMaxReadPlan : public TableReadPlan
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GroupMinMaxReadPlan(bool have_min_arg,
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KEY_PART_INFO *min_max_arg_part_arg,
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uint32_t group_prefix_len_arg,
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uint32_t used_key_parts_arg,
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uint32_t group_key_parts_arg,
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uint32_t key_infix_len_arg,
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unsigned char *key_infix_arg,
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SEL_ARG *index_tree_arg,
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uint32_t param_idx_arg,
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ha_rows quick_prefix_records_arg)
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quick_prefix_records(quick_prefix_records_arg),
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have_min(have_min_arg),
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have_max(have_max_arg),
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min_max_arg_part(min_max_arg_part_arg),
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group_prefix_len(group_prefix_len_arg),
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used_key_parts(used_key_parts_arg),
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group_key_parts(group_key_parts_arg),
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index_info(index_info_arg),
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key_infix_len(key_infix_len_arg),
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range_tree(tree_arg),
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index_tree(index_tree_arg),
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param_idx(param_idx_arg)
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memcpy(this->key_infix, key_infix_arg, key_infix_len);
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virtual ~GroupMinMaxReadPlan() {} /* Remove gcc warning */
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QuickSelectInterface *make_quick(Parameter *param,
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bool retrieve_full_rows,
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memory::Root *parent_alloc);
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/* Number of records selected by the ranges in index_tree. */
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ha_rows quick_prefix_records;
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KEY_PART_INFO *min_max_arg_part;
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uint32_t group_prefix_len;
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uint32_t used_key_parts;
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uint32_t group_key_parts;
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uint32_t key_infix_len;
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unsigned char key_infix[MAX_KEY_LENGTH];
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SEL_TREE *range_tree; /* Represents all range predicates in the query. */
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SEL_ARG *index_tree; /* The SEL_ARG sub-tree corresponding to index_info. */
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uint32_t param_idx; /* Index of used key in param->key. */
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} /* namespace optimizer */
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} /* namespace drizzled */
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#endif /* DRIZZLED_OPTIMIZER_TABLE_READ_PLAN_H */