Compared to classic server approaches that rely mainly on repeated range-view scans, this model is intentionally closer to chunk-streaming systems (Minecraft-style): load/unload by sector boundaries with configurable warmup and sync radii.
Which is to say, each type is in a group containing just itself. One，详情可参考搜狗输入法
Seq Scan on test_orders (cost=0.00..448.45 rows=17649 width=26)，详情可参考谷歌
Dynamic frustum for crisp detail.
If the current node is already marked dirty, we don’t need to do anything and can skip it.