@Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (!(obj instanceof BaseColumnInfo)) {
        return false;
      }
      BaseColumnInfo ci = (BaseColumnInfo) obj;
      return (column == null ? ci.column == null : column.equals(ci.column))
        && (tabAlias == null ? ci.tabAlias == null : tabAlias.equals(ci.tabAlias));
    }
@param column the column to set
ql/src/java/org/apache/hadoop/hive/ql/hooks/LineageInfo.java