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/* 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_expr_func_hpp
#define ODBC_CODEGEN_Code_expr_func_hpp
#include <common/common.hpp>
#include <common/DataField.hpp>
#include "Code_expr.hpp"
#include "Code_expr_row.hpp"
/**
* @class Expr_func
* @brief Specifies a function
*/
struct Expr_func {
enum Code {
Undef = 0,
Substr,
Left,
Right,
Count,
Max,
Min,
Sum,
Avg,
Rownum,
Sysdate
};
Expr_func(Code code, const char* name, bool aggr);
Code m_code;
const char* m_name;
bool m_aggr;
static const Expr_func& find(const char* name);
};
inline
Expr_func::Expr_func(Code code, const char* name, bool aggr) :
m_code(code),
m_name(name),
m_aggr(aggr)
{
}
/**
* @class Plan_expr_func
* @brief Function node in an expression in PlanTree
*/
class Plan_expr_func : public Plan_expr {
public:
Plan_expr_func(Plan_root* root, const Expr_func& func);
virtual ~Plan_expr_func();
Plan_base* analyze(Ctx& ctx, Ctl& ctl);
Exec_base* codegen(Ctx& ctx, Ctl& ctl);
void print(Ctx& ctx);
bool isEqual(const Plan_expr* expr) const;
bool isGroupBy(const Plan_expr_row* row) const;
// children
void setArgs(Plan_expr_row* args);
protected:
const Expr_func& m_func;
Plan_expr_row* m_args;
unsigned m_narg;
SqlType* m_conv; // temp work area
};
inline
Plan_expr_func::Plan_expr_func(Plan_root* root, const Expr_func& func) :
Plan_expr(root, TypeFunc),
m_func(func),
m_args(0),
m_narg(0),
m_conv(0)
{
}
inline void
Plan_expr_func::setArgs(Plan_expr_row* args)
{
if (args == 0) {
m_args = 0;
m_narg = 0;
} else {
m_args = args;
m_narg = m_args->getSize();
delete[] m_conv;
m_conv = new SqlType[1 + m_narg];
}
}
/**
* @class Exec_expr_func
* @brief Function node in an expression in ExecTree
*/
class Exec_expr_func : public Exec_expr {
public:
class Code : public Exec_expr::Code {
public:
Code(const Expr_func& func, const SqlSpec& spec);
virtual ~Code();
protected:
friend class Plan_expr_func;
friend class Exec_expr_func;
const Expr_func& m_func;
const SqlSpec m_sqlSpec;
unsigned m_narg;
Exec_expr** m_args; // XXX pointers for now
};
class Data : public Exec_expr::Data {
public:
Data(const SqlField& sqlField);
virtual ~Data();
protected:
friend class Exec_expr_func;
SqlField m_sqlField;
struct Acc { // accumulators etc
SqlBigint m_count; // current row count
union {
SqlBigint m_bigint;
SqlDouble m_double;
SqlDatetime m_sysdate;
};
};
// group-by extra accumulators (default in entry 0)
typedef std::vector<Acc> GroupAcc;
GroupAcc m_groupAcc;
};
Exec_expr_func(Exec_root* root);
virtual ~Exec_expr_func();
void alloc(Ctx& ctx, Ctl& ctl);
void evaluate(Ctx& ctx, Ctl& ctl);
void close(Ctx& ctx);
void print(Ctx& ctx);
// children
const Code& getCode() const;
Data& getData() const;
protected:
void init(Ctx &ctx, Ctl& ctl); // initialize values
};
inline
Exec_expr_func::Code::Code(const Expr_func& func, const SqlSpec& sqlSpec) :
Exec_expr::Code(m_sqlSpec),
m_func(func),
m_sqlSpec(sqlSpec),
m_args(0)
{
}
inline
Exec_expr_func::Data::Data(const SqlField& sqlField) :
Exec_expr::Data(m_sqlField),
m_sqlField(sqlField),
m_groupAcc(1)
{
}
inline
Exec_expr_func::Exec_expr_func(Exec_root* root) :
Exec_expr(root)
{
}
// children
inline const Exec_expr_func::Code&
Exec_expr_func::getCode() const
{
const Code* code = static_cast<const Code*>(m_code);
return *code;
}
inline Exec_expr_func::Data&
Exec_expr_func::getData() const
{
Data* data = static_cast<Data*>(m_data);
return *data;
}
#endif
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