Minor Description
ExpressionSet ++ method in the master branch a little slower than the branch-3.3 with Scala-2.13
For example, write a microbenchmark as follows and run with Scala 2.13:
val valuesPerIteration = 100000
val benchmark = new Benchmark("Test ExpressionSet ++ ", valuesPerIteration, output = output)
val aUpper = AttributeReference("A", IntegerType)(exprId = ExprId(1))
val initialSet = ExpressionSet(aUpper + 1 :: Rand(0) :: Nil)
val setToAddWithSameDeterministicExpression = ExpressionSet(aUpper + 1 :: Rand(0) :: Nil)
benchmark.addCase("Test ++") { _: Int =>
for (_ <- 0L until valuesPerIteration) {
initialSet ++ setToAddWithSameDeterministicExpression
}
}
benchmark.run()
branch-3.3 result:
OpenJDK 64-Bit Server VM 1.8.0_312-b07 on Linux 4.14.0_1-0-0-45 Intel(R) Xeon(R) Gold 6XXXC CPU @ 2.60GHz Test ExpressionSet ++ : Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ Test ++ 14 16 4 7.2 139.1 1.0X
master result :
OpenJDK 64-Bit Server VM 1.8.0_312-b07 on Linux 4.14.0_1-0-0-45 Intel(R) Xeon(R) Gold 6XXXC CPU @ 2.60GHz Test ExpressionSet ++ : Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ Test ++ 16 19 5 6.1 163.9 1.0X
