code: private List<String> getColumnNameSuggestions() {
          final CrosstabDimension columnDimension =
                  _columnStatisticsCrosstab.getDimension(BooleanAnalyzer.DIMENSION_COLUMN);
          return columnDimension.getCategories();
      }
docs: Because the {@link BooleanAnalyzer} is also wrapped by other analyzers
  which internally create transformed columns, we need to expose the
  metrics here based on string names instead of {@link InputColumn}
  objects. This method is used to provide suggestions for all these string
  column names.
  
  @return