On macOS, when running a MySQL query, we see the following error:
```
java.lang.ClassCastException: class io.netty.channel.kqueue.KQueueEventLoopGroup cannot be cast to class io.netty.channel.EventLoopGroup
```
This is because of a `LinkageError`, caused because these classes exist both in the parent `server` module classpath, as well as in this plugin's classpath separately. To fix this, we removed this dependency from the server module.
But then, this caused a problem with how the `DNSResolver` class was being, well, resolved by the application class loader, vs the plugin class loader. This is a macOS specific problem, and doesn't affect other operating systems.
For this, we add just this package as a dependency to the MySQL plugin.
1. Add R2BC driver and remove JDBC driver usage in mysql plugin to make the plugin reactive.
2. Update dependencies in POM file.
3. Update mysql plugin to return result based on the type of sql query i.e select vs other queries. In case the queries are chained, then the last query is used for deciding the type.
4. Added a new TC for testing datasource and removed a non functional TC.
The plugin class loader from Pf4J looks for jars under target/lib
to use to load any classes that are missing target/classes. This
PR adds the `maven-dependency-plugin` to copy the jars to this
folder automatically so the classes are available during
development.
This commit adds the Mysql plugin to the Appsmith server. We also add a migration to ensure that this plugin is installed by default for all existing organizations. The migration also adds the plugin details into the DB.
Also adding the test cases for mysql plugin.
Co-authored-by: Arpit Mohan <arpit@appsmith.com>
Co-authored-by: Hetu Nandu <hetu@appsmith.com>
Co-authored-by: Arpit Mohan <me@arpitmohan.com>
Co-authored-by: Nupur Singhal <nupursinghal@Nupurs-MacBook-Air.local>
