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[CP] fix calc prefix sort cost bug

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This commit is contained in:
zzg19950727
2024-03-21 09:21:42 +00:00
committed by ob-robot
parent d0bac067c4
commit 1d0a5c685e
1 changed files with 6 additions and 19 deletions
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25
src/sql/optimizer/ob_opt_est_cost_model.cpp
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@ -770,25 +770,7 @@ int ObOptEstCostModel::cost_prefix_sort(const ObSortCostInfo &cost_info,
} else {
num_rows_per_group = rows / num_distinct_rows;
}
if (topn_count >= 0 && num_rows_per_group > 0) {
// topn prefix sort
double remaining_count = topn_count;
while (remaining_count > 0 && num_rows_per_group > 0) {
ObSortCostInfo cost_info_per_group(num_rows_per_group,
width,
prefix_pos,
ordering_per_group,
false);
cost_info_per_group.topn_ = remaining_count;
if (OB_FAIL(cost_sort(cost_info_per_group, cost_per_group))) {
LOG_WARN("failed to cost sort", K(ret));
} else {
cost += cost_per_group;
remaining_count -= num_rows_per_group;
}
}
} else {
// normal prefix sort
if (OB_SUCC(ret)) {
ObSortCostInfo cost_info_per_group(num_rows_per_group,
width,
prefix_pos,
@ -798,7 +780,12 @@ int ObOptEstCostModel::cost_prefix_sort(const ObSortCostInfo &cost_info,
cost_info.sel_ctx_);
if (OB_FAIL(cost_sort(cost_info_per_group, cost_per_group))) {
LOG_WARN("failed to calc cost", K(ret));
} else if (topn_count >= 0 && num_rows_per_group > 0) {
// topn prefix sort
cost = cost_per_group * (topn_count / num_rows_per_group);
LOG_TRACE("OPT: [COST PREFIX TOPN SORT]", K(cost), K(cost_per_group), K(topn_count), K(num_rows_per_group));
} else {
// normal prefix sort
cost = cost_per_group * num_distinct_rows;
LOG_TRACE("OPT: [COST PREFIX SORT]", K(cost), K(cost_per_group), K(num_distinct_rows));
}