xiaokang commented on code in PR #36292:
URL: https://github.com/apache/doris/pull/36292#discussion_r1641597598
##########
be/src/olap/rowset/segment_v2/segment_iterator.cpp:
##########
@@ -984,7 +1012,7 @@ std::string
SegmentIterator::_gen_predicate_result_sign(ColumnPredicate* predica
std::string col_name = column_desc->name();
- if (column_desc->path() != nullptr) {
+ if (column_desc->path() != nullptr && !_storage_name_and_type.empty()) {
Review Comment:
Is this another problem?
##########
be/src/olap/rowset/segment_v2/segment_iterator.cpp:
##########
@@ -343,6 +343,34 @@ Status SegmentIterator::_init_impl(const
StorageReadOptions& opts) {
_storage_name_and_type[i] = std::make_pair(col->name(),
storage_type);
}
}
+
+ // find columns that definitely require reading data, such as functions
that are not pushed down.
+ {
+ std::set<std::string> push_down_preds;
+ for (auto* pred : _col_predicates) {
+ if (!_check_apply_by_inverted_index(pred)) {
+ continue;
+ }
+ push_down_preds.insert(_gen_predicate_result_sign(pred));
Review Comment:
Pred may not be evaluated by index even if
_check_apply_by_inverted_index(pred) return true due to skip index based on hit
ratio. So push_down_preds.contains(column_sign) can not guarantee that the pred
for column_sing can be skipped.
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