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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.hpp"
#include "Code_query_join.hpp"
#include "Code_query_scan.hpp"
#include "Code_root.hpp"
// Plan_query_join
Plan_query_join::~Plan_query_join()
{
}
Plan_base*
Plan_query_join::analyze(Ctx& ctx, Ctl& ctl)
{
ctx_assert(m_inner != 0);
m_inner->analyze(ctx, ctl);
if (! ctx.ok())
return 0;
ctx_assert(m_outer != 0);
m_outer->analyze(ctx, ctl);
if (! ctx.ok())
return 0;
return this;
}
Exec_base*
Plan_query_join::codegen(Ctx& ctx, Ctl& ctl)
{
// generate code for subqueries
ctx_assert(m_inner != 0);
Exec_query* execInner = static_cast<Exec_query*>(m_inner->codegen(ctx, ctl));
if (! ctx.ok())
return 0;
ctx_assert(execInner != 0);
ctx_assert(m_outer != 0);
ctl.m_execQuery = execInner;
Exec_query* execOuter = static_cast<Exec_query*>(m_outer->codegen(ctx, ctl));
if (! ctx.ok())
return 0;
ctx_assert(execOuter != 0);
// combine sql specs from subqueries
const SqlSpecs& specsInner = execInner->getCode().sqlSpecs();
const SqlSpecs& specsOuter = execOuter->getCode().sqlSpecs();
SqlSpecs sqlSpecs(specsInner.count() + specsOuter.count());
for (unsigned i = 1; i <= specsInner.count(); i++) {
const SqlSpec sqlSpec(specsInner.getEntry(i), SqlSpec::Reference);
sqlSpecs.setEntry(i, sqlSpec);
}
for (unsigned i = 1; i <= specsOuter.count(); i++) {
const SqlSpec sqlSpec(specsOuter.getEntry(i), SqlSpec::Reference);
sqlSpecs.setEntry(specsInner.count() + i, sqlSpec);
}
// create the code
Exec_query_join* exec = new Exec_query_join(ctl.m_execRoot);
ctl.m_execRoot->saveNode(exec);
exec->setInner(execInner);
exec->setOuter(execOuter);
Exec_query_join::Code& code = *new Exec_query_join::Code(sqlSpecs);
exec->setCode(code);
return exec;
}
void
Plan_query_join::print(Ctx& ctx)
{
ctx.print(" [query_join");
Plan_base* a[] = { m_inner, m_outer };
printList(ctx, a, 2);
ctx.print("]");
}
// Exec_query_join
Exec_query_join::Code::~Code()
{
}
Exec_query_join::Data::~Data()
{
}
Exec_query_join::~Exec_query_join()
{
}
void
Exec_query_join::alloc(Ctx& ctx, Ctl& ctl)
{
// allocate the subqueries
ctx_assert(m_inner != 0);
m_inner->alloc(ctx, ctl);
if (! ctx.ok())
return;
ctx_assert(m_outer != 0);
ctl.m_query = m_inner;
m_outer->alloc(ctx, ctl);
if (! ctx.ok())
return;
// combine data rows from subqueries
const Code& code = getCode();
const SqlRow& rowInner = m_inner->getData().sqlRow();
const SqlRow& rowOuter = m_outer->getData().sqlRow();
SqlRow sqlRow(code.m_sqlSpecs);
for (unsigned i = 1; i <= rowInner.count(); i++) {
const SqlSpec& sqlSpec = code.m_sqlSpecs.getEntry(i);
const SqlField sqlField(sqlSpec, &rowInner.getEntry(i));
sqlRow.setEntry(i, sqlField);
}
for (unsigned i = 1; i <= rowOuter.count(); i++) {
const SqlSpec& sqlSpec = code.m_sqlSpecs.getEntry(rowInner.count() + i);
const SqlField sqlField(sqlSpec, &rowOuter.getEntry(i));
sqlRow.setEntry(rowInner.count() + i, sqlField);
}
// create the data
Data& data = *new Data(this, sqlRow);
setData(data);
}
void
Exec_query_join::execImpl(Ctx& ctx, Ctl& ctl)
{
// execute only inner query
ctx_assert(m_inner != 0);
m_inner->execute(ctx, ctl);
}
bool
Exec_query_join::fetchImpl(Ctx& ctx, Ctl& ctl)
{
ctx_assert(m_inner != 0);
ctx_assert(m_outer != 0);
if (getData().getState() == ResultSet::State_init) {
// fetch first row from inner
if (! m_inner->fetch(ctx, ctl))
return false;
}
while (1) {
if (m_outer->getData().getState() == ResultSet::State_end) {
// execute or re-execute outer
Ctl ctl(0);
m_outer->close(ctx);
if (! ctx.ok())
return false;
m_outer->execute(ctx, ctl);
if (! ctx.ok())
return false;
}
if (! m_outer->fetch(ctx, ctl)) {
if (! ctx.ok())
return false;
// fetch next row from inner
if (! m_inner->fetch(ctx, ctl))
return false;
}
else
return true;
}
}
void
Exec_query_join::close(Ctx& ctx)
{
ctx_assert(m_inner != 0);
m_inner->close(ctx);
ctx_assert(m_outer != 0);
m_outer->close(ctx);
}
void
Exec_query_join::print(Ctx& ctx)
{
ctx.print(" [query_join");
Exec_base* a[] = { m_inner, m_outer };
printList(ctx, a, 2);
ctx.print("]");
}
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