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From MasterDDT <...@git.apache.org>
Subject [GitHub] spark issue #17400: [SPARK-19981][SQL] Update output partitioning info. in P...
Date Tue, 28 Mar 2017 13:26:55 GMT
Github user MasterDDT commented on the issue:

    https://github.com/apache/spark/pull/17400
  
    Here is a sort example:
    
    ```
    scala> val df1 = Seq((1, 2), (3, 4)).toDF("a", "b").sort("a")
    df1: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [a: int, b: int]
    
    scala> val df2 = df1.selectExpr("a as newA", "b")
    df2: org.apache.spark.sql.DataFrame = [newA: int, b: int]
    
    scala> println(df1.join(df2, df1("a") === df2("newA")).queryExecution.executedPlan)
    *SortMergeJoin [args=[a#37119], [newA#37125], Inner][outPart=PartitioningCollection(8,
hashpartitioning(a#37119, 8)%NONNULL,hashpartitioning(newA#37125, 8)%NONNULL)][outOrder=List(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL, newA#37125:int%NONNULL,
b#37136:int%NONNULL)]
    :- *Sort [args=[a#37119 ASC], false, 0][outPart=HashPartitioning(8, a#37119:int%NONNULL)][outOrder=List(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
    :  +- Exchange [args=hashpartitioning(a#37119, 8)%NONNULL][outPart=HashPartitioning(8,
a#37119:int%NONNULL)][outOrder=List()][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
    :     +- *Sort [args=[a#37119 ASC], true, 0][outPart=RangePartitioning(8, a#37119 ASC%NONNULL)][outOrder=ArrayBuffer(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
    :        +- Exchange [args=rangepartitioning(a#37119 ASC, 8)%NONNULL][outPart=RangePartitioning(8,
a#37119 ASC%NONNULL)][outOrder=List()][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
    :           +- LocalTableScan [args=[a#37119, b#37120]][outPart=UnknownPartitioning(0)][outOrder=List()][output=List(a#37119:int%NONNULL,
b#37120:int%NONNULL)]
    +- *Sort [args=[newA#37125 ASC], false, 0][outPart=HashPartitioning(8, newA#37125:int%NONNULL)][outOrder=List(newA#37125
ASC%NONNULL)][output=ArrayBuffer(newA#37125:int%NONNULL, b#37136:int%NONNULL)]
       +- Exchange [args=hashpartitioning(newA#37125, 8)%NONNULL][outPart=HashPartitioning(8,
newA#37125:int%NONNULL)][outOrder=List()][output=ArrayBuffer(newA#37125:int%NONNULL, b#37136:int%NONNULL)]
          +- *Project [args=[a#37135 AS newA#37125, b#37136]][outPart=RangePartitioning(8,
a#37135 ASC%NONNULL)][outOrder=ArrayBuffer(a#37135 ASC%NONNULL)][output=ArrayBuffer(newA#37125:int%NONNULL,
b#37136:int%NONNULL)]
             +- *Sort [args=[a#37135 ASC], true, 0][outPart=RangePartitioning(8, a#37135 ASC%NONNULL)][outOrder=ArrayBuffer(a#37135
ASC%NONNULL)][output=List(a#37135:int%NONNULL, b#37136:int%NONNULL)]
                +- Exchange [args=rangepartitioning(a#37135 ASC, 8)%NONNULL][outPart=RangePartitioning(8,
a#37135 ASC%NONNULL)][outOrder=List()][output=List(a#37135:int%NONNULL, b#37136:int%NONNULL)]
                   +- LocalTableScan [args=[a#37135, b#37136]][outPart=UnknownPartitioning(0)][outOrder=List()][output=List(a#37135:int%NONNULL,
b#37136:int%NONNULL)]
    ```


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