[iotdb] 25/28: add readme

[le...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

leirui pushed a commit to branch research/M4-visualization
in repository https://gitbox.apache.org/repos/asf/iotdb.git

commit f1a33dcde60bc2567c8381ea167552eb4ee7ecfd
Author: Lei Rui <10...@qq.com>
AuthorDate: Fri Feb 3 22:40:59 2023 +0800

    add readme
---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 963063028a..41b866327c 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,10 @@
 
 # M4-LSM 
 - The code of two M4-LSM deployments, M4-UDF and M4-LSM, is available in this repository.
-    - M4-UDF: `org.apache.iotdb.db.query.udf.builtin.UDTFM4MAC`.  
-    The document of the M4 aggregation function (implemented as a UDF based on MA) has been released on the official [website](https://iotdb.apache.org/UserGuide/Master/UDF-Library/M4.html#m4-2) of Apache IoTDB.
+    - M4-UDF: `org.apache.iotdb.db.query.udf.builtin.UDTFM4MAC`. The document of the M4 function is available on the product [website](https://iotdb.apache.org/UserGuide/Master/Operators-Functions/Sample.html#m4-function) of Apache IoTDB.
     - M4-LSM: `org.apache.iotdb.db.query.dataset.groupby.LocalGroupByExecutor4CPV`
         - Step regression index implementation: `org.apache.iotdb.tsfile.file.metadata.statistics.StepRegress`.
     - Some integration tests for correctness are in `org.apache.iotdb.db.integration.m4.MyTest1/2/3/4`.
 - The experiment-related code, data and scripts are in [another GitHub repository](https://github.com/LeiRui/M4-visualization-exp.git) for easier reproducibility.
 - For the README of Apache IoTDB itself, please see [README_IOTDB.md](README_IOTDB.md).
+- To build this repository, run `mvn clean package -DskipTests -pl -distribution`.