[GitHub] [doris] mrhhsg commented on pull request #10386: [improvement]Use std::iota to set values of _block_rowids in SegmentIterator::_read_columns_by_index

[GitBox <gi...@apache.org>]

mrhhsg commented on PR #10386:
URL: https://github.com/apache/doris/pull/10386#issuecomment-1165334068

   > Hi @mrhhsg , the underlying implementation of `std::iota` is also a loop. Why does this modification take effect?
   > 
   > ```c++
   > template <class _ForwardIterator, class _Tp>
   > inline _LIBCPP_INLINE_VISIBILITY
   > void
   > iota(_ForwardIterator __first, _ForwardIterator __last, _Tp __value_)
   > {
   >     for (; __first != __last; ++__first, (void) ++__value_)
   >         *__first = __value_;
   > }
   > ```
   
   Maybe the original for-loop cannot be vectorized.


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