diff options
Diffstat (limited to 'ndb/src/old_files/client/odbc/codegen/Code_query_distinct.hpp')
| -rw-r--r-- | ndb/src/old_files/client/odbc/codegen/Code_query_distinct.hpp | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/ndb/src/old_files/client/odbc/codegen/Code_query_distinct.hpp b/ndb/src/old_files/client/odbc/codegen/Code_query_distinct.hpp new file mode 100644 index 00000000000..62c46bda901 --- /dev/null +++ b/ndb/src/old_files/client/odbc/codegen/Code_query_distinct.hpp @@ -0,0 +1,165 @@ +/* Copyright (C) 2003 MySQL AB + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +#ifndef ODBC_CODEGEN_Code_query_distinct_hpp +#define ODBC_CODEGEN_Code_query_distinct_hpp + +#include <functional> +#include <common/common.hpp> +#include "Code_query.hpp" +#include "Code_expr_row.hpp" +#include "Code_pred.hpp" + +/** + * @class Plan_query_distinct + * @brief Group-by node in PlanTree + */ +class Plan_query_distinct : public Plan_query { +public: + Plan_query_distinct(Plan_root* root); + virtual ~Plan_query_distinct(); + Plan_base* analyze(Ctx& ctx, Ctl& ctl); + Exec_base* codegen(Ctx& ctx, Ctl& ctl); + void print(Ctx& ctx); + // children + void setQuery(Plan_query* query); + Plan_expr_row* getRow(); +protected: + Plan_query* m_query; +}; + +inline +Plan_query_distinct::Plan_query_distinct(Plan_root* root) : + Plan_query(root), + m_query(0) +{ +} + +// children + +inline void +Plan_query_distinct::setQuery(Plan_query* query) +{ + ctx_assert(query != 0); + m_query = query; +} + +/** + * Distinct preserves order of input rows so we use 2 data structures: + * map<row> = index and vector<index> = row (index >= 0). + */ + +class Exec_query_distinct; + +struct DistinctLess : std::binary_function<const SqlRow*, const SqlRow*, bool> { + bool operator()(const SqlRow* s1, const SqlRow* s2) const; +}; + +typedef std::map<const SqlRow*, unsigned, DistinctLess> DistinctList; + +typedef std::vector<const SqlRow*> DistinctVector; + +/** + * @class Exec_query_distinct + * @brief Group-by node in ExecTree + */ +class Exec_query_distinct : public Exec_query { +public: + class Code : public Exec_query::Code { + public: + Code(const SqlSpecs& sqlSpecs); + virtual ~Code(); + protected: + friend class Exec_query_distinct; + // sets reference to Sqlspecs from subquery + }; + class Data : public Exec_query::Data { + public: + Data(Exec_query_distinct* node, const SqlSpecs& sqlSpecs); + virtual ~Data(); + protected: + friend class Exec_query_distinct; + SqlRow m_sqlRow; // current row + bool m_grouped; // fetch and group-by done + unsigned m_count; + DistinctList m_groupList; + DistinctVector m_groupVector; + unsigned m_index; + }; + Exec_query_distinct(Exec_root* root); + virtual ~Exec_query_distinct(); + void alloc(Ctx& ctx, Ctl& ctl); + void execImpl(Ctx& ctx, Ctl& ctl); + bool fetchImpl(Ctx& ctx, Ctl& ctl); + void close(Ctx& ctx); + void print(Ctx& ctx); + // children + const Code& getCode() const; + Data& getData() const; + void setQuery(Exec_query* query); + const Exec_query* getRawQuery() const; +protected: + friend class Exec_query; + Exec_query* m_query; +}; + +inline +Exec_query_distinct::Code::Code(const SqlSpecs& sqlSpecs) : + Exec_query::Code(sqlSpecs) +{ +} + +inline +Exec_query_distinct::Data::Data(Exec_query_distinct* node, const SqlSpecs& sqlSpecs) : + Exec_query::Data(node, m_sqlRow), + m_sqlRow(sqlSpecs), + m_grouped(false), + m_count(0), + m_index(0) +{ +} + +inline +Exec_query_distinct::Exec_query_distinct(Exec_root* root) : + Exec_query(root), + m_query(0) +{ +} + +// children + +inline const Exec_query_distinct::Code& +Exec_query_distinct::getCode() const +{ + const Code* code = static_cast<const Code*>(m_code); + return *code; +} + +inline Exec_query_distinct::Data& +Exec_query_distinct::getData() const +{ + Data* data = static_cast<Data*>(m_data); + return *data; +} + +inline void +Exec_query_distinct::setQuery(Exec_query* query) +{ + ctx_assert(m_query == 0 && query != 0); + m_query = query; +} + +#endif |