The following areas might be a source of issues when starting to use the version Southside 15.x, so please make yourself familiar with this section.
Remove disableGreenplumOptimizer() Method
The Groovy API Method disableGreenplumOptimizer() should be completely removed from the code before you start upgrade process. This requirement is related to the Greenplum support deprecation announcement. For more information see Release Notes (Southside 15.0).