Github user michaelkamprath commented on a diff in the pull request:
https://github.com/apache/spark/pull/16403#discussion_r94049578
--- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/Platform.java
---
@@ -252,6 +272,7 @@ public static void throwException(Throwable t) {
LONG_ARRAY_OFFSET = 0;
FLOAT_ARRAY_OFFSET = 0;
DOUBLE_ARRAY_OFFSET = 0;
+ _doubleAccessFunc = null;
--- End diff --
I am setting it to `null` to keep in line with the behavior of the
`_UNSAFE` class variable. In case, `_UNSAFE` is null. In that case, any calls
to the `Platform.get...` or `Platform.put...` will result in a
`NullPointerException`. I'm assuming it is a programming error elsewhere to
call these methods without checking (
[example](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/memory/MemoryManager.scala#L200)
).
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