In order to support paimon with hive2, we need to modify the origin HiveMetastoreClient.java
to let it compatible with both hive2 and hive3.
And this modified HiveMetastoreClient should be at the front of the CLASSPATH, so that
it can overwrite the HiveMetastoreClient in hadoop jar.
This PR mainly changes:
1. Copy HiveMetastoreClient.java in FE to BE's preload jar.
2. Split the origin `preload-extensions-jar-with-dependencies.jar` into 2 jars
1. `preload-extensions-project.jar`, which contains the modified HiveMetastoreClient.
2. `preload-extensions-jar-with-dependencies.jar`, which contains other dependency jars.
3. Modify the `start_be.sh`, to let `preload-extensions-project.jar` be loaded first.
4. Change the way the assemble the jni scanner jar
Only need to assemble the project jar, without other dependencies.
Because actually we only use classed under `org.apache.doris` package.
So remove other unused dependency jars can also reduce the output size of BE.
5. fix bug that the prefix of paimon properties should be `paimon.`, not `paimon`
6. Support paimon with hive2
User can set `hive.version` in paimon catalog properties to specify the hive version.
The java-udf module has become increasingly large and difficult to manage, making it inconvenient to package and use as needed. It needs to be split into multiple sub-modules, such as : java-commom、java-udf、jdbc-scanner、hudi-scanner、 paimon-scanner.
Co-authored-by: lexluo <lexluo@tencent.com>
