wangbo commented on code in PR #8967:
URL: https://github.com/apache/incubator-doris/pull/8967#discussion_r848353898
##########
be/src/vec/columns/column_vector.h:
##########
@@ -168,18 +168,16 @@ class ColumnVector final : public
COWHelper<ColumnVectorHelper, ColumnVector<T>>
}
void insert_date_column(const char* data_ptr, size_t num) {
- size_t value_size = sizeof(uint24_t);
+ size_t input_value_size = sizeof(uint24_t);
+
for (int i = 0; i < num; i++) {
- const char* cur_ptr = data_ptr + value_size * i;
- uint64_t value = 0;
- value = *(unsigned char*)(cur_ptr + 2);
- value <<= 8;
- value |= *(unsigned char*)(cur_ptr + 1);
- value <<= 8;
- value |= *(unsigned char*)(cur_ptr);
- vectorized::VecDateTimeValue date;
- date.from_olap_date(value);
- this->insert_data(reinterpret_cast<char*>(&date), 0);
+ uint64_t val = 0;
+ memcpy((char*)(&val), data_ptr, input_value_size);
+ data_ptr += input_value_size;
+
+ VecDateTimeValue date;
Review Comment:
```
q1
- OutputColumnTime: 90.720ms
q2
- OutputColumnTime: 286.477ms
q3
- PredColumnReadTime: 6s827ms
```
I did test after move it out of loop.
There is no noticeable performance change.
I guess the cost of allocate a Object like ```VecDateTimeValue``` on stack
is similar to allocate a int64.
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