code: @Override
      public void clearInputColumns() {
          Set<ConfiguredPropertyDescriptor> configuredProperties = getDescriptor().getConfiguredPropertiesForInput();
          for (ConfiguredPropertyDescriptor configuredProperty : configuredProperties) {
              if (configuredProperty.isArray()) {
                  setConfiguredProperty(configuredProperty, new InputColumn[0]);
              } else {
                  setConfiguredProperty(configuredProperty, null);
              }
          }
      }
docs: Removes/clears all input columns