This pr does three things: 1. Use Druid instead of HikariCP in JdbcClient 2. when download udf jar, add the name of the jar package after the local file name. 3. refactor some jdbcResource code
This pr does three things: 1. Use Druid instead of HikariCP in JdbcClient 2. when download udf jar, add the name of the jar package after the local file name. 3. refactor some jdbcResource code