public String toMappingString(String tab, String col) {
    return tab + "." + col + " => {" + tabAlias + ", " + alias + ", "
        + internalName + ": " + getType() + "}";
  }
@param isSkewedCol the isSkewedCol to set
ql/src/java/org/apache/hadoop/hive/ql/exec/ColumnInfo.java