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!


從 read buffer 擴充路徑中的 fillHoles() 開始，查看 issue 中描述的 profiler image 和 300-column benchmark 背景。使用相同的 workload，將目前逐元素填充的方式與 bulk 方式進行比較；完成的標準是針對效能疑慮得出經過測量的結論，並且只有在比較結果支持的情況下才進行有針對性的修改。

由索引模型根據 Issue 內容生成。