Github user wzhfy commented on a diff in the pull request:
    --- Diff: 
    @@ -32,19 +34,74 @@ package org.apache.spark.sql.catalyst.plans.logical
      * @param sizeInBytes Physical size in bytes. For leaf operators this 
defaults to 1, otherwise it
      *                    defaults to the product of children's `sizeInBytes`.
      * @param rowCount Estimated number of rows.
    + * @param colStats Column-level statistics.
      * @param isBroadcastable If true, output is small enough to be used in a 
broadcast join.
     case class Statistics(
         sizeInBytes: BigInt,
         rowCount: Option[BigInt] = None,
    +    colStats: Map[String, ColumnStats] = Map.empty,
         isBroadcastable: Boolean = false) {
       override def toString: String = "Statistics(" + simpleString + ")"
       /** Readable string representation for the Statistics. */
       def simpleString: String = {
           if (rowCount.isDefined) s"rowCount=${rowCount.get}" else "",
    +      if (colStats.nonEmpty) s"colStats=$colStats" else "",
    --- End diff --
    BTW, I've created a jira for this. We can fix it when column-level 
statistics including histograms are supported.

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