wutiangan commented on a change in pull request #4002:
URL: https://github.com/apache/incubator-doris/pull/4002#discussion_r448755605
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File path: be/src/exec/olap_scan_node.cpp
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@@ -681,7 +681,11 @@ Status OlapScanNode::start_scan_thread(RuntimeState*
state) {
}
OlapScanner* scanner = new OlapScanner(
state, this, _olap_scan_node.is_preaggregation,
_need_agg_finalize, *scan_range, scanner_ranges);
+ // add scanner to pool before doing prepare.
+ // so that scanner can be automatically deconstructed if prepare
failed.
_scanner_pool->add(scanner);
Review comment:
It doesn't matter whether you add the scanner to the pool before or
after doing prepare.
if you put scanner preparing before add the scanner_pool，the scanner will be
decontruced.
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