jacktengg opened a new pull request, #21420:
URL: https://github.com/apache/doris/pull/21420
and remove prefetch when insert data into columns, because it's effect is
not stable in production env.
## Proposed changes
Issue Number: close #xxx
For the following test:
```
{
auto col = doris::vectorized::ColumnString::create();
constexpr int build_rows = 5131;
constexpr int output_rows = 435699854;
std::string str("01234567");
for (int i = 0; i < build_rows; ++i) {
col->insert_data(str.data(), str.size());
}
int indices[output_rows];
for (int i = 0; i < output_rows; ++i) {
indices[i] = i % build_rows;
}
auto col2 = doris::vectorized::ColumnString::create();
doris::MonotonicStopWatch watch;
watch.start();
col2->insert_indices_from(*col, indices, indices + output_rows);
watch.stop();
LOG(WARNING) << "string column insert_indices_from, rows: " <<
output_rows << ", time: " << doris::PrettyPrinter::print(watch.elapsed_time(),
doris::TUnit::TIME_NS);
}
```
The inserting time improve from 6s665ms to 3s158ms
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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