/**

* Copyright (c) 2021 OceanBase

* OceanBase CE is licensed under Mulan PubL v2.

* You can use this software according to the terms and conditions of the Mulan PubL v2.

* You may obtain a copy of Mulan PubL v2 at:

* http://license.coscl.org.cn/MulanPubL-2.0

* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,

* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,

* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.

* See the Mulan PubL v2 for more details.

*/

#define USING_LOG_PREFIX SQL_OPT

#include "ob_log_delete.h"

#include "ob_log_plan.h"

#include "sql/optimizer/ob_optimizer_context.h"

#include "sql/optimizer/ob_opt_est_cost.h"

#include "sql/optimizer/ob_del_upd_log_plan.h"

#include "sql/optimizer/ob_join_order.h"

#include "common/ob_smart_call.h"

using namespace oceanbase;

using namespace sql;

using namespace oceanbase::common;

const char *ObLogDelete::get_name() const

{

const char *name = NULL;

if (is_multi_part_dml()) {

name = "DISTRIBUTED DELETE";

} else if (is_pdml() && is_index_maintenance()) {

// PDML 索引表的delete，使用 INDEX DELETE

name = "INDEX DELETE";

} else {

// 默认Delete的name：DELETE

// PDML 主表的delete，也默认使用name：DELETE

name = ObLogDelUpd::get_name();

}

return name;

}

int ObLogDelete::est_cost()

{

int ret = OB_SUCCESS;

ObLogicalOperator *child = NULL;

if (OB_ISNULL(child = get_child(ObLogicalOperator::first_child))) {

ret = OB_ERR_UNEXPECTED;

LOG_WARN("child is null", K(ret), K(child));

} else {

double op_cost = 0.0;

if (OB_FAIL(inner_est_cost(child->get_card(), op_cost))) {

LOG_WARN("failed to get delete cost", K(ret));

} else {

set_op_cost(op_cost);

set_cost(child->get_cost() + get_op_cost());

set_card(child->get_card());

}

}

return ret;

}

int ObLogDelete::do_re_est_cost(EstimateCostInfo &param, double &card, double &op_cost, double &cost)

{

int ret = OB_SUCCESS;

ObLogicalOperator *child = NULL;

if (OB_ISNULL(child = get_child(ObLogicalOperator::first_child))) {

ret = OB_ERR_UNEXPECTED;

LOG_WARN("get unexpected null", K(child), K(ret));

} else {

double child_card = child->get_card();

double child_cost = child->get_cost();

if (OB_FAIL(SMART_CALL(child->re_est_cost(param, child_card, child_cost)))) {

LOG_WARN("failed to re est exchange cost", K(ret));

} else if (OB_FAIL(inner_est_cost(child_card, op_cost))) {

LOG_WARN("failed to get delete cost", K(ret));

} else {

cost = child_cost + op_cost;

card = child_card;

}

}

return ret;

}

int ObLogDelete::inner_est_cost(double child_card, double &op_cost)

{

int ret = OB_SUCCESS;

ObDelUpCostInfo cost_info(0,0,0);

cost_info.affect_rows_ = child_card;

cost_info.index_count_ = get_index_dml_infos().count();

IndexDMLInfo* delete_dml_info = nullptr;

if (OB_ISNULL(get_plan()) || OB_UNLIKELY(cost_info.index_count_ <= 0) ||

OB_ISNULL(delete_dml_info = get_index_dml_infos().at(0))) {

ret = OB_ERR_UNEXPECTED;

LOG_WARN("get unexpected null", K(ret), K(get_plan()), K(delete_dml_info));

} else {

ObOptimizerContext &opt_ctx = get_plan()->get_optimizer_context();

cost_info.constraint_count_ = delete_dml_info->ck_cst_exprs_.count();

if (OB_FAIL(ObOptEstCost::cost_delete(cost_info, op_cost, opt_ctx))) {

LOG_WARN("failed to get delete cost", K(ret));

}

}

return ret;

}

int ObLogDelete::get_op_exprs(ObIArray<ObRawExpr*> &all_exprs)

{

int ret = OB_SUCCESS;

if (OB_FAIL(ObLogDelUpd::inner_get_op_exprs(all_exprs, true))) {

LOG_WARN("failed to get op exprs", K(ret));

} else { /*do nothing*/ }

return ret;

}

int ObLogDelete::generate_multi_part_partition_id_expr()

{

int ret = OB_SUCCESS;

for (int64_t i = 0; OB_SUCC(ret) && i < get_index_dml_infos().count(); ++i) {

if (OB_ISNULL(get_index_dml_infos().at(i))) {

ret = OB_ERR_UNEXPECTED;

LOG_WARN("index dml info is null", K(ret));

} else if (OB_FAIL(generate_old_calc_partid_expr(*get_index_dml_infos().at(i)))) {

LOG_WARN("failed to generate calc partid expr", K(ret));

} else { /*do nothing*/ }

}

return ret;

}

int ObLogDelete::generate_rowid_expr_for_trigger()

{

int ret = OB_SUCCESS;

if (lib::is_oracle_mode() && !has_instead_of_trigger()) {

for (int64_t i = 0; OB_SUCC(ret) && i < get_index_dml_infos().count(); ++i) {

bool has_trg = false;

IndexDMLInfo *dml_info = get_index_dml_infos().at(i);

if (OB_ISNULL(dml_info)) {

ret = OB_ERR_UNEXPECTED;

LOG_WARN("dml info is null", K(ret), K(dml_info));

} else if (!dml_info->is_primary_index_) {

// do nothing

} else if (OB_FAIL(check_has_trigger(dml_info->ref_table_id_, has_trg))) {

LOG_WARN("failed to check has trigger", K(ret));

} else if (!has_trg) {

// do nothing

} else if (OB_FAIL(generate_old_rowid_expr(*dml_info))) {

LOG_WARN("failed to generate rowid expr", K(ret));

} else { /*do nothing*/ }

}

}

return ret;

}

int ObLogDelete::generate_part_id_expr_for_foreign_key(ObIArray<ObRawExpr*> &all_exprs)

{

// NOTE: for delete parent table, don't support foregin key checks use das task now,

// no need to generate part id expr, do nothing here

int ret = OB_SUCCESS;

return ret;

}

int ObLogDelete::get_plan_item_info(PlanText &plan_text,

ObSqlPlanItem &plan_item)

{

int ret = OB_SUCCESS;

if (OB_FAIL(ObLogDelUpd::get_plan_item_info(plan_text, plan_item))) {

LOG_WARN("failed to get plan item info", K(ret));

} else {

BEGIN_BUF_PRINT;

if (OB_FAIL(print_table_infos(ObString::make_string("table_columns"),

buf,

buf_len,

pos,

type))) {

LOG_WARN("failed to print table infos", K(ret));

} else if (need_barrier()) {

ret = BUF_PRINTF(", ");

ret = BUF_PRINTF("with_barrier");

}

END_BUF_PRINT(plan_item.special_predicates_,

plan_item. special_predicates_len_);

}

return ret;

}