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[SPARK-18714][SQL] Add a simple time function to SparkSession #16140

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[SPARK-18714][SQL] Add a simple time function to SparkSession #16140

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16 changes: 16 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -618,6 +618,22 @@ class SparkSession private(
@InterfaceStability.Evolving
def readStream: DataStreamReader = new DataStreamReader(self)

/**
* Executes some code block and prints to stdout the time taken to execute the block. This is
* available in Scala only and is used primarily for interactive testing and debugging.
*
* @since 2.1.0
*/
@InterfaceStability.Stable
def time[T](f: => T): T = {
val start = System.nanoTime()
val ret = f
val end = System.nanoTime()
// scalastyle:off println
println(s"Time taken: ${(end - start) / 1000 / 1000} ms")
// scalastyle:on println
ret
}

// scalastyle:off
// Disable style checker so "implicits" object can start with lowercase i
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