Code_comp_op.cpp
上传用户:romrleung
上传日期:2022-05-23
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文件大小:11k
- /* 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 <dictionary/DictColumn.hpp>
- #include "Code_pred.hpp"
- #include "Code_comp_op.hpp"
- #include "Code_expr_conv.hpp"
- #include "Code_expr_column.hpp"
- #include "Code_table.hpp"
- #include "Code_root.hpp"
- // Comp_op
- const char*
- Comp_op::name() const
- {
- switch (m_opcode) {
- case Eq:
- return "=";
- case Noteq:
- return "!=";
- case Lt:
- return "<";
- case Lteq:
- return "<=";
- case Gt:
- return ">";
- case Gteq:
- return ">=";
- case Like:
- return "like";
- case Notlike:
- return "not like";
- case Isnull:
- return "is null";
- case Isnotnull:
- return "is not null";
- }
- ctx_assert(false);
- return "";
- }
- unsigned
- Comp_op::arity() const
- {
- switch (m_opcode) {
- case Eq:
- case Noteq:
- case Lt:
- case Lteq:
- case Gt:
- case Gteq:
- case Like:
- case Notlike:
- return 2;
- case Isnull:
- case Isnotnull:
- return 1;
- }
- ctx_assert(false);
- return 0;
- }
- // Plan_comp_op
- Plan_comp_op::~Plan_comp_op()
- {
- }
- Plan_base*
- Plan_comp_op::analyze(Ctx& ctx, Ctl& ctl)
- {
- m_exec = 0;
- const unsigned arity = m_op.arity();
- // analyze operands
- for (unsigned i = 1; i <= arity; i++) {
- ctx_assert(m_expr[i] != 0);
- m_expr[i]->analyze(ctx, ctl);
- if (! ctx.ok())
- return 0;
- }
- // for each operand, find type to convert to
- SqlType con[1 + 2];
- if (arity == 1) {
- const SqlType& t1 = m_expr[1]->sqlType();
- switch (t1.type()) {
- case SqlType::Char:
- case SqlType::Varchar:
- case SqlType::Smallint:
- case SqlType::Integer:
- case SqlType::Bigint:
- case SqlType::Real:
- case SqlType::Double:
- case SqlType::Datetime:
- case SqlType::Null:
- case SqlType::Unbound:
- con[1] = t1;
- break;
- default:
- break;
- }
- if (con[1].type() == SqlType::Undef) {
- char b1[40];
- t1.print(b1, sizeof(b1));
- ctx.pushStatus(Error::Gen, "type mismatch in comparison: %s %s", b1, m_op.name());
- return 0;
- }
- } else if (arity == 2) {
- const SqlType& t1 = m_expr[1]->sqlType();
- const SqlType& t2 = m_expr[2]->sqlType();
- switch (t1.type()) {
- case SqlType::Char:
- switch (t2.type()) {
- case SqlType::Char:
- case SqlType::Varchar:
- case SqlType::Null:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Varchar:
- switch (t2.type()) {
- case SqlType::Char:
- case SqlType::Varchar:
- case SqlType::Null:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Smallint:
- case SqlType::Integer:
- case SqlType::Bigint:
- switch (t2.type()) {
- case SqlType::Smallint:
- case SqlType::Integer:
- case SqlType::Bigint:
- // conversion would mask primary key optimization
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Real:
- case SqlType::Double:
- con[1].setType(ctx, SqlType::Double);
- con[2] = con[1];
- break;
- case SqlType::Null:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Real:
- case SqlType::Double:
- switch (t2.type()) {
- case SqlType::Smallint:
- case SqlType::Integer:
- case SqlType::Bigint:
- case SqlType::Real:
- case SqlType::Double:
- con[1].setType(ctx, SqlType::Double);
- con[2] = con[1];
- break;
- case SqlType::Null:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Datetime:
- switch (t2.type()) {
- case SqlType::Datetime:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Null:
- switch (t2.type()) {
- case SqlType::Char:
- case SqlType::Varchar:
- case SqlType::Smallint:
- case SqlType::Integer:
- case SqlType::Bigint:
- case SqlType::Real:
- case SqlType::Double:
- case SqlType::Datetime:
- con[1] = t1;
- con[2] = t2;
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t2;
- break;
- default:
- break;
- }
- break;
- case SqlType::Unbound:
- con[1] = con[2] = t1;
- break;
- default:
- break;
- }
- if (con[1].type() == SqlType::Undef || con[2].type() == SqlType::Undef) {
- char b1[40], b2[40];
- t1.print(b1, sizeof(b1));
- t2.print(b2, sizeof(b2));
- ctx.pushStatus(Error::Gen, "type mismatch in comparison: %s %s %s", b1, m_op.name(), b2);
- return 0;
- }
- } else {
- ctx_assert(false);
- return 0;
- }
- if (! ctx.ok())
- return 0;
- // insert required conversions
- for (unsigned i = 1; i <= arity; i++) {
- if (con[i].type() == SqlType::Unbound) {
- continue;
- }
- Plan_expr_conv* exprConv = new Plan_expr_conv(m_root, con[i]);
- m_root->saveNode(exprConv);
- exprConv->setExpr(m_expr[i]);
- m_expr[i] = static_cast<Plan_expr*>(exprConv->analyze(ctx, ctl));
- if (! ctx.ok())
- return 0;
- ctx_assert(m_expr[i] != 0);
- }
- // look for column=expr
- if (ctl.m_topand && m_op.m_opcode == Comp_op::Eq) {
- ctx_assert(arity == 2);
- for (unsigned i = 1, j = 2; i <= 2; i++, j--) {
- if (m_expr[i]->type() != Plan_expr::TypeColumn)
- continue;
- Plan_expr_column* column = static_cast<Plan_expr_column*>(m_expr[i]);
- if (! column->resolveEq(ctx, m_expr[j]))
- ctl.m_extra = true;
- }
- } else {
- ctl.m_extra = true;
- }
- // save top level comparison on list
- if (ctl.m_topand) {
- ctl.m_topcomp.push_back(this);
- }
- // table dependencies are union from operands
- m_tableSet.clear();
- for (unsigned i = 1; i <= arity; i++) {
- const TableSet& ts = m_expr[i]->tableSet();
- m_tableSet.insert(ts.begin(), ts.end());
- }
- // set of tables for which interpreter cannot be used
- m_noInterp.clear();
- // convenient
- #undef ustype
- #define ustype(b, n) (((b) ? 1 : 0) * 100 + (n))
- if (arity == 1) {
- for (unsigned i = 1; i <= 1; i++) {
- const SqlType t1 = m_expr[i]->sqlType();
- switch (m_op.m_opcode) {
- case Comp_op::Isnull:
- case Comp_op::Isnotnull:
- if (m_expr[i]->type() == Plan_expr::TypeColumn) {
- switch (ustype(t1.unSigned(), t1.type())) {
- // all types accepted now
- default:
- {
- Plan_expr_column* column = static_cast<Plan_expr_column*>(m_expr[i]);
- ctx_assert(column->m_resTable != 0);
- m_interpColumn[i] = column;
- continue; // ok
- }
- break;
- }
- }
- break;
- default:
- break;
- }
- const TableSet& ts = m_expr[i]->tableSet();
- m_noInterp.insert(ts.begin(), ts.end());
- }
- } else if (arity == 2) {
- for (unsigned i = 1, j = 2; i <= 2; i++, j--) {
- const SqlType t1 = m_expr[i]->sqlType();
- switch (m_op.m_opcode) {
- case Comp_op::Like:
- case Comp_op::Notlike:
- if (i == 2) // col like val but not val like col
- break;
- /*FALLTHRU*/
- case Comp_op::Eq:
- case Comp_op::Noteq:
- case Comp_op::Lt:
- case Comp_op::Lteq:
- case Comp_op::Gt:
- case Comp_op::Gteq:
- if (m_expr[i]->type() == Plan_expr::TypeColumn) {
- switch (ustype(t1.unSigned(), t1.type())) {
- case ustype(false, SqlType::Char):
- case ustype(false, SqlType::Varchar):
- case ustype(true, SqlType::Smallint):
- case ustype(true, SqlType::Integer):
- case ustype(true, SqlType::Bigint):
- {
- Plan_expr_column* column = static_cast<Plan_expr_column*>(m_expr[i]);
- ctx_assert(column->m_resTable != 0);
- const TableSet& ts = m_expr[j]->tableSet();
- if (ts.find(column->m_resTable) == ts.end()) {
- // candidate for column=const
- m_interpColumn[i] = column;
- continue; // ok
- }
- }
- break;
- default:
- break;
- }
- }
- break;
- default:
- break;
- }
- const TableSet& ts = m_expr[i]->tableSet();
- m_noInterp.insert(ts.begin(), ts.end());
- }
- } else {
- ctx_assert(false);
- return 0;
- }
- #undef ustype
- return this;
- }
- Exec_base*
- Plan_comp_op::codegen(Ctx& ctx, Ctl& ctl)
- {
- if (m_exec != 0)
- return m_exec;
- const unsigned arity = m_op.arity();
- Exec_comp_op* exec = new Exec_comp_op(ctl.m_execRoot);
- ctl.m_execRoot->saveNode(exec);
- // create code for operands
- for (unsigned i = 1; i <= arity; i++) {
- ctx_assert(m_expr[i] != 0);
- Exec_expr* execExpr = static_cast<Exec_expr*>(m_expr[i]->codegen(ctx, ctl));
- if (! ctx.ok())
- return 0;
- ctx_assert(execExpr != 0);
- exec->setExpr(i, execExpr);
- }
- // create the code
- Exec_comp_op::Code& code = *new Exec_comp_op::Code(m_op);
- // interpreted column=const
- if (! ctl.m_having) {
- ctx_assert(ctl.m_topTable != 0);
- for (unsigned i = 1; i <= arity; i++) {
- Plan_expr_column* column = m_interpColumn[i];
- if (column == 0)
- continue;
- ctx_assert(column->m_resTable != 0);
- if (column->m_resTable != ctl.m_topTable)
- continue;
- ctx_assert(code.m_interpColumn == 0);
- code.m_interpColumn = i;
- code.m_interpAttrId = column->dictColumn().getAttrId();
- ctx_log2(("can use interpreter on %s", column->getPrintName()));
- }
- }
- exec->setCode(code);
- m_exec = exec;
- return exec;
- }
- void
- Plan_comp_op::print(Ctx& ctx)
- {
- ctx.print(" [%s", m_op.name());
- Plan_base* a[] = { m_expr[1], m_expr[2] };
- printList(ctx, a, m_op.arity());
- ctx.print("]");
- }
- bool
- Plan_comp_op::isGroupBy(const Plan_expr_row* row) const
- {
- const unsigned arity = m_op.arity();
- for (unsigned i = 1; i <= arity; i++) {
- ctx_assert(m_expr[i] != 0);
- if (! m_expr[i]->isGroupBy(row))
- return false;
- }
- return true;
- }
- // Code_comp_op
- Exec_comp_op::Code::~Code()
- {
- }
- Exec_comp_op::Data::~Data()
- {
- }
- Exec_comp_op::~Exec_comp_op()
- {
- }
- void
- Exec_comp_op::alloc(Ctx& ctx, Ctl& ctl)
- {
- const Code& code = getCode();
- // allocate subexpressions
- unsigned arity = code.m_op.arity();
- for (unsigned i = 1; i <= arity; i++) {
- ctx_assert(m_expr[i] != 0);
- m_expr[i]->alloc(ctx, ctl);
- if (! ctx.ok())
- return;
- }
- Data& data = *new Data;
- setData(data);
- }
- void
- Exec_comp_op::close(Ctx& ctx)
- {
- const Code& code = getCode();
- unsigned arity = code.m_op.arity();
- for (unsigned i = 1; i <= arity; i++) {
- ctx_assert(m_expr[i] != 0);
- m_expr[i]->close(ctx);
- }
- }
- void
- Exec_comp_op::print(Ctx& ctx)
- {
- const Code& code = getCode();
- ctx.print(" [%s", code.m_op.name());
- Exec_base* a[] = { m_expr[1], m_expr[2] };
- printList(ctx, a, code.m_op.arity());
- ctx.print("]");
- }