Alima777 commented on a change in pull request #825: [IOTDB-499] Add query
engine decument
URL: https://github.com/apache/incubator-iotdb/pull/825#discussion_r381261940
##########
File path: docs/Documentation-CHN/SystemDesign/2-QueryEngine/2-Planner.md
##########
@@ -50,14 +68,193 @@ mvn clean compile
之后生成代码位置：server/target/generated-sources/ant
谓词去非优化器，将谓词逻辑中的非操作符去掉。
* org.apache.iotdb.db.qp.strategy.optimizer.DnfFilterOptimizer
-
+
将谓词转化为析取范式。
-
+
* org.apache.iotdb.db.qp.strategy.optimizer.MergeSingleFilterOptimizer
将相同路径的谓词逻辑合并。
-
+
+### ConcatPathOptimizer
+
+ConcatPathOptimizer 使用其中的 transform() 方法将给定查询中 SELECT 子句、FROM 子句和 WHERE
子句中的路径进行合并。该方法的申明如下：
Review comment:
```suggestion
ConcatPathOptimizer 使用其中的 transform() 方法将给定查询中 FROM 子句中的前缀路径与 SELECT 子句，
WHERE 子句中的后缀路径进行拼接。该方法的申明如下：
```
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
