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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_query_filter.hpp"
#include "Code_query_join.hpp"
#include "Code_query_scan.hpp"
#include "Code_root.hpp"
// Plan_query_filter
Plan_query_filter::~Plan_query_filter()
{
}
Plan_base*
Plan_query_filter::analyze(Ctx& ctx, Ctl& ctl)
{
ctx_assert(m_query != 0);
m_query->analyze(ctx, ctl);
if (! ctx.ok())
return 0;
ctx_assert(m_pred != 0);
m_pred->analyze(ctx, ctl);
if (! ctx.ok())
return 0;
return this;
}
Exec_base*
Plan_query_filter::codegen(Ctx& ctx, Ctl& ctl)
{
// generate code for the subquery
ctx_assert(m_query != 0);
Exec_query* execQuery = static_cast<Exec_query*>(m_query->codegen(ctx, ctl));
if (! ctx.ok())
return 0;
ctx_assert(execQuery != 0);
// create code for the predicate based on query code
Exec_pred* execPred = 0;
ctl.m_execQuery = execQuery;
ctx_assert(m_topTable != 0);
ctl.m_topTable = m_topTable;
ctx_assert(m_pred != 0);
execPred = static_cast<Exec_pred*>(m_pred->codegen(ctx, ctl));
if (! ctx.ok())
return 0;
ctx_assert(execPred != 0);
ctl.m_topTable = 0;
// re-use SqlSpecs from subquery
const Exec_query::Code& codeQuery = execQuery->getCode();
const SqlSpecs& sqlSpecs = codeQuery.sqlSpecs();
Exec_query_filter* exec = new Exec_query_filter(ctl.m_execRoot);
ctl.m_execRoot->saveNode(exec);
Exec_query_filter::Code& code = *new Exec_query_filter::Code(sqlSpecs);
exec->setCode(code);
exec->setQuery(execQuery);
exec->setPred(execPred);
return exec;
}
void
Plan_query_filter::print(Ctx& ctx)
{
ctx.print(" [query_filter");
Plan_base* a[] = { m_query, m_pred };
printList(ctx, a, 2);
ctx.print("]");
}
// Exec_query_filter
Exec_query_filter::Code::~Code()
{
}
Exec_query_filter::Data::~Data()
{
}
Exec_query_filter::~Exec_query_filter()
{
}
void
Exec_query_filter::alloc(Ctx& ctx, Ctl& ctl)
{
// allocate the subquery
ctx_assert(m_query != 0);
m_query->alloc(ctx, ctl);
if (! ctx.ok())
return;
// allocate the predicate
ctl.m_query = m_query;
ctx_assert(m_pred != 0);
m_pred->alloc(ctx, ctl);
if (! ctx.ok())
return;
// re-use SqlRow from subquery
Exec_query::Data& dataQuery = m_query->getData();
Data& data = *new Data(this, dataQuery.sqlRow());
setData(data);
}
void
Exec_query_filter::execImpl(Ctx& ctx, Ctl& ctl)
{
// execute subquery
ctx_assert(m_query != 0);
m_query->execute(ctx, ctl);
}
bool
Exec_query_filter::fetchImpl(Ctx& ctx, Ctl& ctl)
{
// invoke fetch on subquery until predicate is true
ctx_assert(m_query != 0);
while (m_query->fetch(ctx, ctl)) {
ctx_assert(m_pred != 0);
m_pred->evaluate(ctx, ctl);
if (! ctx.ok())
return false;
if (m_pred->getData().getValue() == Pred_value_true) {
ctl.m_postEval = true;
m_pred->evaluate(ctx, ctl);
ctl.m_postEval = false;
return true;
}
}
return false;
}
void
Exec_query_filter::close(Ctx& ctx)
{
ctx_assert(m_query != 0);
m_query->close(ctx);
ctx_assert(m_pred != 0);
m_pred->close(ctx);
}
void
Exec_query_filter::print(Ctx& ctx)
{
ctx.print(" [query_filter");
Exec_base* a[] = { m_query, m_pred };
printList(ctx, a, 2);
ctx.print("]");
}
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