zuochunwei commented on a change in pull request #7855:
URL: https://github.com/apache/incubator-doris/pull/7855#discussion_r790575780
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File path: be/src/vec/columns/column_vector.h
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@@ -120,10 +120,13 @@ class ColumnVector final : public
COWHelper<ColumnVectorHelper, ColumnVector<T>>
ColumnVector(std::initializer_list<T> il) : data {il} {}
void insert_res_column(const uint16_t* sel, size_t sel_size,
vectorized::ColumnVector<T>* res_ptr) {
+ auto& res_data = res_ptr->data;
+ res_data.reserve(res_ptr->size() + sel_size);
Review comment:
because i will insert sel_size elements into res_ptr's data
the operation of reserve will supply enough memory for assigning one by one
in the loop.
each insert_data() call will check whether need to alloc bigger memory chunk
in push_back(), that's not highly efficient.
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