zenoyang commented on code in PR #9167:
URL: https://github.com/apache/incubator-doris/pull/9167#discussion_r855934825
##########
be/src/vec/columns/column_dictionary.h:
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@@ -106,6 +107,7 @@ class ColumnDictionary final : public COWHelper<IColumn,
ColumnDictionary<T>> {
void clear() override {
_codes.clear();
_dict_code_converted = false;
+ _dict.clear_hash_values();
Review Comment:
`hash_values` only needs to be calculated once.
If `clear_hash_values` is called here, the hash of the dictionary values
needs to be calculated once for each call to `SegmentIterator::next_batch`.
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