Performance concern: fillHoles() method and read buffer expansion efficiency.

Hi everyone,

I have the following use case: I’m benchmarking the read throughput performance when dealing with a large number of non-dictionary string columns (300 columns). Based on the profiler output (see the attached picture), I’ve noticed that a significant amount of time is spent in the fillHoles() method, which is part of the read buffer expansion process.

My question is: why is the buffer filled one element at a time instead of using a bulk operation? Wouldn’t a batch approach be more efficient?

Looking forward to your insights. Thanks!


从 read buffer 扩展路径中的 fillHoles() 开始，查看 issue 中描述的 profiler image 和 300-column benchmark 背景。使用相同的 workload，将当前逐元素填充方式与 bulk 方式进行比较；完成的标准是针对性能问题得出经过测量的结论，并且只有在比较结果支持的情况下才进行有针对性的修改。

由索引模型根据 Issue 内容生成。