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[FEAT MERGE] [CP] Improve the rowcount estimation

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Co-authored-by: akaError <lzg020616@163.com>
This commit is contained in:
xianyu-w
2024-02-09 19:58:18 +00:00
committed by ob-robot
parent da232dc640
commit dc32079645
70 changed files with 5953 additions and 3722 deletions
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38
src/sql/optimizer/ob_log_set.cpp
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@ -421,30 +421,52 @@ int ObLogSet::get_re_est_cost_infos(const EstimateCostInfo &param,
const double need_row_count = (is_recursive_union() || !is_set_distinct())
&& param.need_row_count_ >= 0 && param.need_row_count_ < card_
? param.need_row_count_ : -1;
bool need_scale_ndv = (need_row_count == -1);
double cur_child_card = 0.0;
double cur_child_cost = 0.0;
if (OB_UNLIKELY(is_set_distinct() && get_num_of_child() != child_ndv_.count())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected child ndv count", K(child_ndv_));
}
for (int64_t i = 0; OB_SUCC(ret) && i < get_num_of_child(); ++i) {
const ObLogicalOperator *child = get_child(i);
cur_param.reset();
double origin_child_card = 0;
if (OB_ISNULL(child)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("set operator i-th child is null", K(ret), K(i));
} else if (OB_FAIL(cur_param.assign(param))) {
LOG_WARN("failed to assign param", K(ret));
} else if (OB_FALSE_IT(cur_param.need_row_count_ = need_row_count)) {
} else {
cur_param.need_row_count_ = need_row_count;
origin_child_card = child->get_card();
}
if (OB_FAIL(ret)) {
} else if (OB_FAIL(get_child(i)->re_est_cost(cur_param, cur_child_card, cur_child_cost))) {
LOG_WARN("failed to re-est child cost", K(ret), K(i));
} else if (OB_FAIL(cost_infos.push_back(ObBasicCostInfo(cur_child_card, cur_child_cost,
child->get_width())))) {
LOG_WARN("push back child's cost info failed", K(ret));
} else if (ObSelectStmt::UNION == get_set_op()) {
card += cur_child_card;
} else if (ObSelectStmt::UNION == get_set_op() && !is_set_distinct()) {
ObSelectStmt::SetOperator set_type = is_recursive_union() ? ObSelectStmt::RECURSIVE : ObSelectStmt::UNION;
if (0 == i) {
card = cur_child_card;
} else {
card = ObOptSelectivity::get_set_stmt_output_count(card, cur_child_card, set_type);
}
child_cost += cur_child_cost;
} else if (ObSelectStmt::INTERSECT == get_set_op()) {
card = (0 == i || cur_child_card < card) ? cur_child_card : card;
child_cost += cur_child_cost;
} else if (ObSelectStmt::EXCEPT == get_set_op()) {
card = 0 == i ? cur_child_card : card;
} else {
double cur_child_ndv = child_ndv_.at(i);
if (need_scale_ndv) {
cur_child_ndv = std::min(
cur_child_ndv,
ObOptSelectivity::scale_distinct(cur_child_card, origin_child_card, cur_child_ndv));
}
if (0 == i) {
card = cur_child_ndv;
} else {
card = ObOptSelectivity::get_set_stmt_output_count(card, cur_child_ndv, get_set_op());
}
child_cost += cur_child_cost;
}
}