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| # Quick Start | |
| ## Priority of Operators | |
| |priority|operator |meaning | | |
| |:---:|:------------|:------------------| | |
| |1 |`-` |Unary operator negative | | |
| |1 |`+` |Unary operator positive | | |
| |1 |`!` |Unary operator negation | | |
| |2 |`*` |Binary operator multiply | | |
| |2 |`/` |Binary operator division | | |
| |2 |`%` |Binary operator remainder| | |
| |3 |`+` |Binary operator add | | |
| |3 |`-` |Binary operator minus | | |
| |4 |`>` |Binary compare operator greater than| | |
| |4 |`>=` |Binary compare operator greater or equal to| | |
| |4 |`<` |Binary compare operator less than| | |
| |4 |`<=` |Binary compare operator less or equal to| | |
| |4 |`==` |Binary compare operator equal to| | |
| |4 |`!=`/`<>` |Binary compare operator non-equal to| | |
| |5 |`REGEXP` |`REGEXP` operator| | |
| |5 |`LIKE` |`LIKE` operator| | |
| |6 |`IN` |`IN` operator| | |
| |7 |`and`/`&`/`&&` |Binary logic operator and| | |
| |8 |`or`/ | / || |Binary logic operator or| | |
| ## About | |
| For applications based on time series data, data quality is vital. | |
| **UDF Library** is IoTDB User Defined Functions (UDF) about data quality, including data profiling, data quality evalution and data repairing. | |
| It effectively meets the demand for data quality in the industrial field. | |
| ## Quick Start | |
| 1. Download the JAR with all dependencies and the script of registering UDF. | |
| 2. Copy the JAR package to `ext\udf` under the directory of IoTDB system (Please put JAR to this directory of all DataNodes if you use Cluster). | |
| 3. Run `sbin\start-server.bat` (for Windows) or `sbin\start-server.sh` (for Linux or MacOS) to start IoTDB server. | |
| 4. Copy the script to the directory of IoTDB system (under the root directory, at the same level as `sbin`), modify the parameters in the script if needed and run it to register UDF. | |
| ## Download | |
| Since our codes are still under review, there are no codes in Apache repository. Before finishing the review, the above files can be downloaded in our [old website](https://thulab.github.io/iotdb-quality/en/Download.html). | |