Github user tejasapatil commented on a diff in the pull request:
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -1139,9 +1154,14 @@ class SQLConf extends Serializable with Logging {
       def windowExecBufferSpillThreshold: Int = 
    +  def windowExecBufferInMemoryThreshold: Int = 
       def sortMergeJoinExecBufferSpillThreshold: Int =
    +  def sortMergeJoinExecBufferInMemoryThreshold: Int =
    --- End diff --
    Sure. Since there was no in-memory buffer for cartesian product before, I 
am using a conservative value 4096 for the in-memory buffer threshold. However, 
the spill threshold is set to 
`UnsafeExternalSorter.DEFAULT_NUM_ELEMENTS_FOR_SPILL_THRESHOLD` like it was 

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