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src/sql/optimizer/ob_log_topk.cpp Normal file
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/**
* 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_topk.h"
#include "ob_log_group_by.h"
#include "ob_log_operator_factory.h"
#include "ob_log_sort.h"
#include "ob_log_table_scan.h"
#include "ob_optimizer_util.h"
#include "ob_opt_est_cost.h"
#include "sql/rewrite/ob_transform_utils.h"
using namespace oceanbase::sql;
using namespace oceanbase::common;
using namespace oceanbase::sql::log_op_def;
int ObLogTopk::set_topk_params(
ObRawExpr* limit_count, ObRawExpr* limit_offset, int64_t minimum_row_count, int64_t topk_precision)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(limit_count)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("limit_count is NULL", K(ret));
} else {
topk_limit_count_ = limit_count;
topk_limit_offset_ = limit_offset;
minimum_row_count_ = minimum_row_count;
topk_precision_ = topk_precision;
}
return ret;
}
int ObLogTopk::copy_without_child(ObLogicalOperator*& out)
{
int ret = OB_SUCCESS;
out = NULL;
ObLogicalOperator* op = NULL;
ObLogTopk* topk = NULL;
if (OB_FAIL(clone(op))) {
LOG_WARN("failed to clone ObLogTopk", K(ret));
} else if (OB_ISNULL(topk = static_cast<ObLogTopk*>(op))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to cast ObLogicalOperator * to ObLogTopk *", K(ret));
} else if (OB_FAIL(
topk->set_topk_params(topk_limit_count_, topk_limit_offset_, minimum_row_count_, topk_precision_))) {
LOG_WARN("failed to set_topk_params", K(ret));
} else {
out = topk;
}
return ret;
}
int ObLogTopk::allocate_exchange_post(AllocExchContext* ctx)
{
int ret = OB_SUCCESS;
ObLogicalOperator* child = NULL;
if (OB_ISNULL(ctx) || OB_ISNULL(child = get_child(first_child))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(ret));
} else if (OB_FAIL(sharding_info_.copy_with_part_keys(child->get_sharding_info()))) {
LOG_WARN("failed to deep copy sharding info from child", K(ret));
} else { /*do nothing*/
}
return ret;
}
int ObLogTopk::allocate_exchange(AllocExchContext* ctx, bool parts_order)
{
UNUSED(ctx);
UNUSED(parts_order);
int ret = OB_ERR_UNEXPECTED;
LOG_WARN("should not come here", K(ret));
return ret;
}
int ObLogTopk::set_topk_size()
{
int ret = OB_SUCCESS;
int64_t limit_count = 0;
int64_t offset_count = 0;
double child_card = 0;
bool is_null_value = false;
if (OB_ISNULL(get_child(first_child)) || OB_ISNULL(get_plan())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpeced null", K(ret));
} else if (FALSE_IT(child_card = get_child(first_child)->get_card())) {
} else if (OB_FAIL(ObTransformUtils::get_limit_value(topk_limit_count_,
get_plan()->get_stmt(),
get_plan()->get_optimizer_context().get_params(),
get_plan()->get_optimizer_context().get_session_info(),
&get_plan()->get_optimizer_context().get_allocator(),
limit_count,
is_null_value))) {
LOG_WARN("Get limit count num error", K(ret));
} else if (!is_null_value && OB_FAIL(ObTransformUtils::get_limit_value(topk_limit_offset_,
get_plan()->get_stmt(),
get_plan()->get_optimizer_context().get_params(),
get_plan()->get_optimizer_context().get_session_info(),
&get_plan()->get_optimizer_context().get_allocator(),
offset_count,
is_null_value))) {
LOG_WARN("Get limit offset num error", K(ret));
} else {
limit_count = is_null_value ? 0 : limit_count + offset_count;
double topk_card = static_cast<double>(std::max(minimum_row_count_, limit_count));
double row_count = child_card * static_cast<double>(topk_precision_) / 100.0;
topk_card = std::max(topk_card, row_count);
topk_card = std::min(topk_card, child_card);
set_card(topk_card);
if (OB_SUCC(ret)) {
double op_cost = ObOptEstCost::cost_limit(get_card());
set_op_cost(op_cost);
set_cost(get_child(first_child)->get_cost() + op_cost);
}
}
return ret;
}
uint64_t ObLogTopk::hash(uint64_t seed) const
{
uint64_t hash_value = seed;
hash_value = do_hash(minimum_row_count_, topk_precision_);
hash_value = ObOptimizerUtil::hash_expr(topk_limit_count_, hash_value);
hash_value = ObOptimizerUtil::hash_expr(topk_limit_offset_, hash_value);
hash_value = ObLogicalOperator::hash(hash_value);
return hash_value;
}
int ObLogTopk::check_output_dep_specific(ObRawExprCheckDep& checker)
{
int ret = OB_SUCCESS;
if (NULL != topk_limit_count_) {
if (OB_FAIL(checker.check(*topk_limit_count_))) {
LOG_WARN("failed to check limit_count_", K(*topk_limit_count_), K(ret));
}
} else { /* Do nothing */
}
if (OB_SUCC(ret)) {
if (NULL != topk_limit_offset_) {
if (OB_FAIL(checker.check(*topk_limit_offset_))) {
LOG_WARN("failed to check limit_offset_", KPC(topk_limit_offset_), K(ret));
}
} else { /* Do nothing */
}
}
return ret;
}
int ObLogTopk::print_my_plan_annotation(char* buf, int64_t& buf_len, int64_t& pos, ExplainType type)
{
int ret = OB_SUCCESS;
if (OB_FAIL(BUF_PRINTF(", minimum_row_count:%ld top_precision:%ld ", minimum_row_count_, topk_precision_))) {
LOG_WARN("BUF_PRINTF fails", K(ret));
} else {
ObRawExpr* limit = topk_limit_count_;
ObRawExpr* offset = topk_limit_offset_;
EXPLAIN_PRINT_EXPR(limit, type);
BUF_PRINTF(", ");
EXPLAIN_PRINT_EXPR(offset, type);
}
return ret;
}
int ObLogTopk::inner_append_not_produced_exprs(ObRawExprUniqueSet& raw_exprs) const
{
int ret = OB_SUCCESS;
OZ(raw_exprs.append(topk_limit_count_));
OZ(raw_exprs.append(topk_limit_offset_));
return ret;
}