Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18843#discussion_r132615896
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -844,24 +844,39 @@ object SQLConf {
           .stringConf
           .createWithDefaultFunction(() => TimeZone.getDefault.getID)
     
    +  val WINDOW_EXEC_BUFFER_IN_MEMORY_THRESHOLD =
    +    buildConf("spark.sql.windowExec.buffer.in.memory.threshold")
    +      .internal()
    +      .doc("Threshold for number of rows guaranteed to be held in memory 
by the window operator")
    +      .intConf
    +      .createWithDefault(4096)
    +
       val WINDOW_EXEC_BUFFER_SPILL_THRESHOLD =
         buildConf("spark.sql.windowExec.buffer.spill.threshold")
           .internal()
    -      .doc("Threshold for number of rows buffered in window operator")
    +      .doc("Threshold for number of rows to be spilled by window operator")
           .intConf
    -      .createWithDefault(4096)
    +      
.createWithDefault(UnsafeExternalSorter.DEFAULT_NUM_ELEMENTS_FOR_SPILL_THRESHOLD.toInt)
    +
    +  val SORT_MERGE_JOIN_EXEC_BUFFER_IN_MEMORY_THRESHOLD =
    +    buildConf("spark.sql.sortMergeJoinExec.buffer.in.memory.threshold")
    +      .internal()
    +      .doc("Threshold for number of rows guaranteed to be held in memory 
by the sort merge " +
    +        "join operator")
    +      .intConf
    +      .createWithDefault(Int.MaxValue)
    --- End diff --
    
    got it


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