Init benchmarks module with multi-projects structure

.github/workflows/ci.yml

@@ -17,3 +17,5 @@ jobs:
       - uses: olafurpg/setup-scala@v10
       - name: Test
         run: sbt -Dspark.testVersion=${{ matrix.spark  }} +test
+      - name: Benchmark
+        run: sbt -Dspark.testVersion=${{ matrix.spark  }} +benchmarks/Jmh/run

benchmarks/src/main/scala/com/github/mrpowers/spark/fast/tests/MyBenchmark.scala

@@ -0,0 +1,41 @@
+package com.github.mrpowers.spark.fast.tests
+
+import org.apache.spark.sql.SparkSession
+import org.openjdk.jmh.annotations._
+import org.openjdk.jmh.infra.Blackhole
+
+import java.util.concurrent.TimeUnit
+import scala.util.Try
+
+private class MyBenchmark extends DataFrameComparer {
+  @Benchmark
+  @BenchmarkMode(Array(Mode.AverageTime, Mode.SingleShotTime))
+  @Fork(value = 2)
+  @Warmup(iterations = 10)
+  @Measurement(iterations = 10)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  def assertApproximateDataFrameEqualityWithPrecision(blackHole: Blackhole): Boolean = {
+    val spark = SparkSession
+      .builder()
+      .master("local")
+      .appName("spark session")
+      .config("spark.sql.shuffle.partitions", "1")
+      .getOrCreate()
+    spark.sparkContext.setLogLevel("ERROR")
+
+    import spark.implicits._
+    val ds1 = Seq(
+      ("1", "10/01/2019", 26.762499999999996),
+      ("1", "11/01/2019", 26.762499999999996)
+    ).toDF("col_B", "col_C", "col_A")
+
+    val ds2 = Seq(
+      ("1", "10/01/2019", 26.762499999999946),
+      ("1", "11/01/2019", 26.76249999999991)
+    ).toDF("col_B", "col_C", "col_A")
+    val result = Try(assertApproximateDataFrameEquality(ds1, ds2, precision = 0.0000001, orderedComparison = false))
+
+    blackHole.consume(result)
+    result.isSuccess
+  }
+}

build.sbt

@@ -8,32 +8,50 @@ version := "1.10.1"
 
 val versionRegex = """^(.*)\.(.*)\.(.*)$""".r
 
-val sparkVersion = settingKey[String]("Spark version")
-
 val scala2_13 = "2.13.14"
 val scala2_12 = "2.12.20"
 
-sparkVersion := System.getProperty("spark.testVersion", "3.5.1")
+val sparkVersion = System.getProperty("spark.testVersion", "3.5.1")
 crossScalaVersions := {
-  sparkVersion.value match {
+  sparkVersion match {
     case versionRegex("3", m, _) if m.toInt >= 2 => Seq(scala2_12, scala2_13)
     case versionRegex("3", _, _)                 => Seq(scala2_12)
   }
 }
 
 scalaVersion := crossScalaVersions.value.head
 
-libraryDependencies += "org.apache.spark" %% "spark-sql" % sparkVersion.value % "provided"
-libraryDependencies += "org.scalatest"    %% "scalatest" % "3.2.18"           % "test"
+Test / fork := true
 
-credentials += Credentials(Path.userHome / ".sbt" / "sonatype_credentials")
+lazy val commonSettings = Seq(
+  javaOptions ++= {
+    Seq("-Xms512M", "-Xmx2048M", "-Duser.timezone=GMT")  ++ (if (System.getProperty("java.version").startsWith("1.8.0"))
+      Seq("-XX:+CMSClassUnloadingEnabled")
+    else Seq.empty)
+  },
+  libraryDependencies ++= Seq(
+    "org.apache.spark" %% "spark-sql" % sparkVersion % "compile",
+    "org.scalatest"    %% "scalatest" % "3.2.18"     % "test"
+  ),
+)
 
-Test / fork := true
-javaOptions ++= {
-  Seq("-Xms512M", "-Xmx2048M", "-Duser.timezone=GMT")  ++ (if (System.getProperty("java.version").startsWith("1.8.0"))
-    Seq("-XX:+CMSClassUnloadingEnabled")
-  else Seq.empty)
-}
+lazy val core = (project in file("core"))
+  .settings(
+    commonSettings,
+    name            := "core",
+  )
+
+lazy val benchmarks = (project in file("benchmarks"))
+  .dependsOn(core)
+  .settings(commonSettings)
+  .settings(
+    libraryDependencies ++= Seq(
+      "org.openjdk.jmh" % "jmh-generator-annprocess" % "1.37" //required for jmh IDEA plugin. Make sure this version matches sbt-jmh version!
+    ),
+    name            := "benchmarks",
+  ).enablePlugins(JmhPlugin)
+
+credentials += Credentials(Path.userHome / ".sbt" / "sonatype_credentials")
 
 licenses := Seq("MIT" -> url("http://opensource.org/licenses/MIT"))
 homepage := Some(url("https://github.com/mrpowers-io/spark-fast-tests"))

project/plugins.sbt

@@ -9,3 +9,5 @@ addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.6.1")
 
 addSbtPlugin("org.typelevel" % "laika-sbt" % "1.2.0")
+
+addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")