Github user wzhfy commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15090#discussion_r79925464
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/Statistics.scala
 ---
    @@ -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 = {
         Seq(s"sizeInBytes=$sizeInBytes",
           if (rowCount.isDefined) s"rowCount=${rowCount.get}" else "",
    +      if (colStats.nonEmpty) s"colStats=$colStats" else "",
           s"isBroadcastable=$isBroadcastable"
    -    ).filter(_.nonEmpty).mkString("", ", ", "")
    +    ).filter(_.nonEmpty).mkString(", ")
    +  }
    +}
    +
    +/**
    + * Statistics for a column.
    + * @param ndv Number of distinct values of the column.
    + */
    +case class ColumnStats(
    +    dataType: DataType,
    +    numNulls: Long,
    +    max: Option[Any] = None,
    +    min: Option[Any] = None,
    +    ndv: Option[Long] = None,
    +    avgColLen: Option[Double] = None,
    +    maxColLen: Option[Long] = None,
    +    numTrues: Option[Long] = None,
    +    numFalses: Option[Long] = None) {
    +
    +  override def toString: String = "ColumnStats(" + simpleString + ")"
    +
    +  def simpleString: String = {
    +    Seq(s"numNulls=$numNulls",
    +      if (max.isDefined) s"max=${max.get}" else "",
    +      if (min.isDefined) s"min=${min.get}" else "",
    +      if (ndv.isDefined) s"ndv=${ndv.get}" else "",
    +      if (avgColLen.isDefined) s"avgColLen=${avgColLen.get}" else "",
    +      if (maxColLen.isDefined) s"maxColLen=${maxColLen.get}" else "",
    +      if (numTrues.isDefined) s"numTrues=${numTrues.get}" else "",
    +      if (numFalses.isDefined) s"numFalses=${numFalses.get}" else ""
    +    ).filter(_.nonEmpty).mkString(", ")
    +  }
    +}
    +
    +object ColumnStats {
    +  def fromString(str: String, dataType: DataType): ColumnStats = {
    --- End diff --
    
    ok


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org

Reply via email to