code: public void setBucketColumns(java.util.Collection<String> bucketColumns) {
          if (bucketColumns == null) {
              this.bucketColumns = null;
              return;
          }
  
          this.bucketColumns = new java.util.ArrayList<String>(bucketColumns);
      }
docs: <p>
  A list of reducer grouping columns, clustering columns, and bucketing columns in the table.
  </p>
  
  @param bucketColumns
  A list of reducer grouping columns, clustering columns, and bucketing columns in the table.