takeWhile() working differently with flatmap

Question

I am creating snippets with takeWhile to explore its possibilities. When used in conjunction with flatMap, the behaviour is not in line with the expectation. Please find the cod

Answer 1

This is a bug no matter how I look at it - and thank you Holger for your comments. I did not want to put this answer in here (seriously!), but none of the answer clearly states that this is a bug.

People are saying that this has to with ordered/un-ordered, and this is not true as this will report true 3 times:

Stream s1 = Arrays.stream(strArray);
System.out.println(s1.spliterator().hasCharacteristics(Spliterator.ORDERED));

Stream s2 = Arrays.stream(strArray)
            .flatMap(indStream -> Arrays.stream(indStream));
System.out.println(s2.spliterator().hasCharacteristics(Spliterator.ORDERED));

Stream s3 = Arrays.stream(strArray)
            .flatMap(indStream -> Arrays.stream(indStream))
            .takeWhile(ele -> !ele.equalsIgnoreCase("Sample4"));
System.out.println(s3.spliterator().hasCharacteristics(Spliterator.ORDERED));

It's very interesting also that if you change it to:

String[][] strArray = { 
         { "Sample1", "Sample2" }, 
         { "Sample3", "Sample5", "Sample4" }, // Sample4 is the last one here
         { "Sample7", "Sample8" } 
};

then Sample7 and Sample8 will not be part of the output, otherwise they will. It seems that flatmap ignores a cancel flag that would be introduced by dropWhile.