本文为摘录，原文为： attachments/pdf/0/p1658-zhao.pdf
QueryFormer:
- learning-based query planer representation model
- with tree-structured Transformer architecture
-integrate histograms from database into query plan encoding
1 INTRODUCTION
Physical Query Plan As DAG (Directed Acyclic Graph)
Figure 1: Example query and query plan
- node 表示操作
- edge 表示方向
- 子节点先执行，执行结果给父节点作为输入
Physical Query Plan 作为机器学习的输入，用以数据库优化