csun5285 commented on code in PR #67915:
URL: https://github.com/apache/doris/pull/67915#discussion_r4004052894
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be/src/exec/operator/olap_scan_operator.cpp:
##########
@@ -764,15 +790,7 @@ Status
OlapScanLocalState::_init_scanners(std::list<ScannerSPtr>* scanners) {
std::max<int64_t>(1024,
state()->parallel_scan_min_rows_per_scanner());
scanner_builder.set_max_scanners_count(max_scanners_count);
scanner_builder.set_min_rows_per_scanner(min_rows_per_scanner);
- // If the session variable is set, force one scanner per segment.
- if (state()->query_options().__isset.optimize_index_scan_parallelism &&
- state()->query_options().optimize_index_scan_parallelism) {
- // TODO: Use optimize_index_scan_parallelism for ann range search
in the future.
- // Currently, ann topn is enough
- if (_ann_topn_runtime != nullptr) {
- scanner_builder.set_scan_parallelism_by_per_segment(true);
- }
- }
+
scanner_builder.set_scan_parallelism_by_per_segment(_use_scan_parallelism_by_per_segment());
Review Comment:
scanner 变多的代价很低
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