private boolean isPruneForListBucketing(Partition part, String columnName) {
      return ListBucketingPrunerUtils.isListBucketingPart(part)
          && (part.getSkewedColNames().contains(columnName));
    }
Check if we prune it for list bucketing
1. column name is part of skewed column
2. partition has skewed value to location map
@param part
@param columnName
@return
ql/src/java/org/apache/hadoop/hive/ql/optimizer/listbucketingpruner/LBExprProcFactory.java