115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
/*
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Copyright (c) 2011, Oracle and/or its affiliates. All rights
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reserved.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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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
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02110-1301 USA
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*/
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#ifndef NDBMEMCACHE_QUERYPLAN_H
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#define NDBMEMCACHE_QUERYPLAN_H
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#ifndef __cplusplus
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#error "This file is for C++ only"
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#endif
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#include <assert.h>
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#include <NdbApi.hpp>
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#include "ndbmemcache_global.h"
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#include "Record.h"
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#include "TableSpec.h"
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/* For each pair [TableSpec,NDB Object], we can cache some dictionary
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lookups, acccess path information, NdbRecords, etc.
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*/
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enum PlanOpts { NoOptions, PKScan };
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/* Forward declarations: */
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class Operation;
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class ExternalValue;
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class QueryPlan {
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friend class Operation;
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friend class ExternalValue;
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public:
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QueryPlan() : initialized(0) {};
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QueryPlan(Ndb *, const TableSpec *, PlanOpts opts = NoOptions);
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~QueryPlan();
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bool canHaveExternalValue() const;
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bool shouldExternalizeValue(size_t length) const;
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bool canUseCommittedRead() const;
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Uint64 getAutoIncrement() const;
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void debug_dump() const;
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bool hasDataOnDisk() const;
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bool hasMathColumn() const;
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/* public instance variables */
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bool initialized;
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bool dup_numbers; /* dup_numbers mode for ascii incr/decr */
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bool pk_access; /* access by primary key */
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bool is_scan;
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size_t max_value_len;
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const TableSpec *spec;
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NdbDictionary::Dictionary *dict;
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const NdbDictionary::Table *table;
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QueryPlan * extern_store; /* QueryPlan for external stored values */
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short cas_column_id;
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short math_column_id;
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unsigned int static_flags;
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protected:
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/* Protected instance variables; visible to Operation class */
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Record * key_record; /* Holds just the key */
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Record * val_record; /* Holds just the values */
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Record * row_record; /* Holds complete row for insert and SCAN */
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private:
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/* Private methods */
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const NdbDictionary::Index * chooseIndex();
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bool keyIsPrimaryKey() const;
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/* Private instance variables */
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Ndb *db;
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bool has_disk_storage;
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};
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inline bool QueryPlan::hasMathColumn() const {
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return spec->math_column;
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}
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inline bool QueryPlan::shouldExternalizeValue(size_t length) const {
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if(extern_store && val_record->value_length)
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return (length > val_record->value_length);
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return false;
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}
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inline bool QueryPlan::canHaveExternalValue() const {
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return (extern_store);
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}
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inline bool QueryPlan::hasDataOnDisk() const {
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return has_disk_storage;
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}
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inline bool QueryPlan::canUseCommittedRead() const {
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return(pk_access && (! extern_store) && (! spec->exp_column));
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}
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#endif
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