private static int indexOfColName(List<? extends BucketSortCol> bucketSortCols, String colName) {
    for (int index = 0; index < bucketSortCols.size(); index++) {
      BucketSortCol bucketSortCol = bucketSortCols.get(index);
      if (bucketSortCol.getNames().indexOf(colName) != -1) {
        return index;
      }
    }

    return -1;
  }
Find the BucketSortCol which has colName as one of its aliases.  Returns the index of that
BucketSortCol, or -1 if none exist
@param bucketSortCols
@param colName
@return
ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/BucketingSortingOpProcFactory.java