luhenry commented on a change in pull request #30810:
URL: https://github.com/apache/spark/pull/30810#discussion_r609559096



##########
File path: project/SparkBuild.scala
##########
@@ -291,6 +291,12 @@ object SparkBuild extends PomBuild {
     publishLocal in SbtCompile := publishTask(publishLocalConfiguration in 
SbtCompile).value,
     publishLocal := Seq(publishLocal in MavenCompile, publishLocal in 
SbtCompile).dependOn.value,
 
+    javaOptions ++= {
+      val versionParts = System.getProperty("java.version").split("[+.\\-]+", 
3)
+      var major = versionParts(0).toInt
+      if (major >= 16) Seq("--add-modules=jdk.incubator.vector") else Seq.empty

Review comment:
       Yes, they would have to. It's one of the failsafe to make sure users 
don't end up using the feature "by accident". That will be the case until the 
Vector API becomes stable (gets out of incubation) and doesn't need this flag 
anymore.




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