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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 */
#include "Code_expr_const.hpp"
#include "Code_root.hpp"
// Plan_expr_const
Plan_expr_const::~Plan_expr_const()
{
}
Plan_base*
Plan_expr_const::analyze(Ctx& ctx, Ctl& ctl)
{
m_exec = 0;
// convert data type
m_lexType.convert(ctx, m_sqlType, m_string.length());
if (! ctx.ok())
return 0;
// depends on no tables
// set alias name
m_alias = m_string;
// node was not changed
return this;
}
Exec_base*
Plan_expr_const::codegen(Ctx& ctx, Ctl& ctl)
{
if (m_exec != 0)
return m_exec;
// convert data
SqlSpec sqlSpec(m_sqlType, SqlSpec::Physical);
SqlField sqlField(sqlSpec);
LexSpec lexSpec(m_lexType);
lexSpec.convert(ctx, m_string, sqlField);
if (! ctx.ok())
return 0;
// create code
Exec_expr_const* exec = new Exec_expr_const(ctl.m_execRoot);
ctl.m_execRoot->saveNode(exec);
Exec_expr_const::Code& code = *new Exec_expr_const::Code(sqlField);
exec->setCode(code);
m_exec = exec;
return exec;
}
void
Plan_expr_const::print(Ctx& ctx)
{
ctx.print(" [const %s]", m_string.c_str());
}
bool
Plan_expr_const::isEqual(const Plan_expr* expr) const
{
ctx_assert(expr != 0);
if (expr->type() != Plan_expr::TypeConst)
return false;
const Plan_expr_const* expr2 = static_cast<const Plan_expr_const*>(expr);
if (strcmp(m_string.c_str(), expr2->m_string.c_str()) != 0)
return false;
return true;
}
bool
Plan_expr_const::isGroupBy(const Plan_expr_row* row) const
{
return true;
}
// Exec_expr_const
Exec_expr_const::Code::~Code()
{
}
Exec_expr_const::Data::~Data()
{
}
Exec_expr_const::~Exec_expr_const()
{
}
void
Exec_expr_const::alloc(Ctx& ctx, Ctl& ctl)
{
if (m_data != 0)
return;
// copy the value for const correctness reasons
SqlField sqlField(getCode().m_sqlField);
Data& data = *new Data(sqlField);
setData(data);
}
void
Exec_expr_const::evaluate(Ctx& ctx, Ctl& ctl)
{
const Code& code = getCode();
Data& data = getData();
if (ctl.m_groupIndex != 0) {
SqlField& out = data.groupField(code.sqlSpec().sqlType(), ctl.m_groupIndex, ctl.m_groupInit);
data.sqlField().copy(ctx, out);
}
}
void
Exec_expr_const::close(Ctx& ctx)
{
Data& data = getData();
data.m_groupField.clear();
}
void
Exec_expr_const::print(Ctx& ctx)
{
const Code& code = getCode();
ctx.print(" [");
char buf[500];
code.m_sqlField.print(buf, sizeof(buf));
ctx.print("%s", buf);
ctx.print("]");
}
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