169 lines
6.6 KiB
C++
169 lines
6.6 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_OPT
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#include "sql/optimizer/ob_log_subplan_scan.h"
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#include "sql/optimizer/ob_log_plan.h"
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#include "sql/optimizer/ob_opt_est_cost.h"
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#include "sql/optimizer/ob_join_order.h"
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#include "common/ob_smart_call.h"
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using namespace oceanbase::sql;
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using namespace oceanbase::common;
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int ObLogSubPlanScan::generate_access_exprs()
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{
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int ret = OB_SUCCESS;
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const ObDMLStmt *stmt = NULL;
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if (OB_ISNULL(get_plan()) || OB_ISNULL(stmt = get_plan()->get_stmt())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(get_plan()), K(stmt), K(ret));
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} else {
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for (int64_t i = 0; OB_SUCC(ret) && i < stmt->get_column_size(); i++) {
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const ColumnItem *col_item = stmt->get_column_item(i);
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if (OB_ISNULL(col_item) || OB_ISNULL(col_item->expr_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(col_item), K(ret));
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} else if (col_item->table_id_ == subquery_id_ &&
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col_item->expr_->is_explicited_reference() &&
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!col_item->expr_->is_unpivot_mocked_column() &&
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OB_FAIL(access_exprs_.push_back(col_item->expr_))) {
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LOG_WARN("failed to push back expr", K(ret));
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} else { /*do nothing*/ }
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}
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}
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return ret;
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}
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int ObLogSubPlanScan::get_op_exprs(ObIArray<ObRawExpr*> &all_exprs)
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(generate_access_exprs())) {
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LOG_WARN("failed to generate access exprs", K(ret));
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} else if (OB_FAIL(append(all_exprs, access_exprs_))) {
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LOG_WARN("failed to append exprs", K(ret));
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} else if (OB_FAIL(ObLogicalOperator::get_op_exprs(all_exprs))) {
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LOG_WARN("failed to append op exprs", K(ret));
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} else { /*do nothing*/ }
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return ret;
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}
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int ObLogSubPlanScan::allocate_expr_post(ObAllocExprContext &ctx)
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{
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int ret = OB_SUCCESS;
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for (int64_t i = 0; OB_SUCC(ret) && i < access_exprs_.count(); i++) {
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ObRawExpr *expr = NULL;
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if (OB_ISNULL(expr = access_exprs_.at(i))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(ret));
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} else if (OB_FAIL(mark_expr_produced(expr, branch_id_, id_, ctx))) {
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LOG_WARN("failed to mark expr as produced", K(ret));
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} else if (!is_plan_root() && OB_FAIL(output_exprs_.push_back(expr))) {
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LOG_WARN("failed to push back expr", K(ret));
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} else { /*do nothing*/ }
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}
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// check if we can produce some more exprs, such as 1 + 'c1' after we have produced 'c1'
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if(OB_SUCC(ret)) {
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if (OB_FAIL(ObLogicalOperator::allocate_expr_post(ctx))) {
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LOG_WARN("failed to allocate expr pre", K(ret));
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} else { /*do nothing*/ }
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}
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return ret;
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}
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int ObLogSubPlanScan::get_plan_item_info(PlanText &plan_text,
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ObSqlPlanItem &plan_item)
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{
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int ret = OB_SUCCESS;
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// print access
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if (OB_FAIL(ObLogicalOperator::get_plan_item_info(plan_text, plan_item))) {
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LOG_WARN("failed to get plan item info", K(ret));
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} else {
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BEGIN_BUF_PRINT;
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const ObIArray<ObRawExpr*> &access = get_access_exprs();
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EXPLAIN_PRINT_EXPRS(access, type);
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END_BUF_PRINT(plan_item.access_predicates_,
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plan_item.access_predicates_len_);
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}
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if (OB_SUCC(ret)) {
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const ObString &name = get_subquery_name();
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BUF_PRINT_OB_STR(name.ptr(),
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name.length(),
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plan_item.object_alias_,
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plan_item.object_alias_len_);
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}
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return ret;
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}
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int ObLogSubPlanScan::do_re_est_cost(EstimateCostInfo ¶m, double &card, double &op_cost, double &cost)
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{
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int ret = OB_SUCCESS;
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ObLogicalOperator *child = NULL;
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const int64_t parallel = param.need_parallel_;
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double selectivity = 1.0;
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if (OB_ISNULL(child = get_child(ObLogicalOperator::first_child)) ||
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OB_ISNULL(get_plan())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(child), K(ret));
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} else if (OB_FALSE_IT(get_plan()->get_selectivity_ctx().init_op_ctx(&child->get_output_equal_sets(), child->get_card()))) {
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} else if (OB_FAIL(ObOptSelectivity::calculate_selectivity(get_plan()->get_basic_table_metas(),
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get_plan()->get_selectivity_ctx(),
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get_filter_exprs(),
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selectivity,
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get_plan()->get_predicate_selectivities()))) {
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LOG_WARN("failed to calculate selectivity", K(ret));
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} else {
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double child_card = child->get_card();
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double child_cost = child->get_cost();
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if (param.need_row_count_ >= 0 && param.need_row_count_ < get_card() &&
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selectivity > 0) {
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param.need_row_count_ /= selectivity;
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}
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if (OB_FAIL(SMART_CALL(child->re_est_cost(param, child_card, child_cost)))) {
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LOG_WARN("failed to re est exchange cost", K(ret));
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} else {
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ObOptimizerContext &opt_ctx = get_plan()->get_optimizer_context();
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op_cost = ObOptEstCost::cost_filter_rows(child_card / parallel,
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get_filter_exprs(),
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opt_ctx);
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cost = child_cost + op_cost;
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card = child_card * selectivity;
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}
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}
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return ret;
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}
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int ObLogSubPlanScan::check_output_dependance(ObIArray<ObRawExpr *> &child_output,
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PPDeps &deps)
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{
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int ret = OB_SUCCESS;
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ObSEArray<ObRawExpr*, 8> exprs;
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LOG_TRACE("start to check output exprs", K(type_), K(child_output), K(deps));
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ObRawExprCheckDep dep_checker(child_output, deps, false);
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if (OB_FAIL(append(exprs, filter_exprs_))) {
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LOG_WARN("failed to append exprs", K(ret));
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} else if (OB_FAIL(append_array_no_dup(exprs, output_exprs_))) {
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LOG_WARN("failed to append array no dup", K(ret));
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} else if (OB_FAIL(dep_checker.check(exprs))) {
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LOG_WARN("failed to check op_exprs", K(ret));
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} else {
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LOG_TRACE("succeed to check output exprs", K(exprs), K(type_), K(deps));
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}
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return ret;
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}
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int ObLogSubPlanScan::is_my_fixed_expr(const ObRawExpr *expr, bool &is_fixed)
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{
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is_fixed = ObOptimizerUtil::find_item(access_exprs_, expr);
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return OB_SUCCESS;
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}
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