[jira] [Created] (LUCENE-7194) Ban Math.toRadians/toDegrees and remove all usages of it

["Robert Muir (JIRA)" <ji...@apache.org>]

Robert Muir created LUCENE-7194:
-----------------------------------

             Summary: Ban Math.toRadians/toDegrees and remove all usages of it
                 Key: LUCENE-7194
                 URL: https://issues.apache.org/jira/browse/LUCENE-7194
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir


The result of these methods is unreliable and changes across jvm versions: we cannot use these methods.

The following program prints 0.7722082215479366 on previous versions of java but 0.7722082215479367 on java 9 because Math.toRadians is no longer doing the same thing:

{code}
public class test {
  public static void main(String args[]) throws Exception {
    System.out.println(Math.toRadians(44.244272));
  }
}
{code}

This is because of https://bugs.openjdk.java.net/browse/JDK-4477961. 

I am not really sure its a bug, because the method says that the conversion is "generally inexact". 



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