Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15084#discussion_r78716354
--- Diff: core/src/main/scala/org/apache/spark/util/collection/BitSet.scala
---
@@ -58,6 +58,20 @@ class BitSet(numBits: Int) extends Serializable {
}
/**
+ * Clear all the bits up to a given index
+ */
+ def clearUntil(bitIndex: Int) {
+ val wordIndex = bitIndex >> 6 // divide by 64
+ var i = 0
+ while(i < wordIndex) { words(i) = 0; i += 1 }
+ if(wordIndex < words.length) {
+ // Set the remaining bits (note that the mask could still be zero)
+ val mask = ~(-1L << (bitIndex & 0x3f))
+ words(wordIndex) &= ~mask
--- End diff --
The mask is negated twice; that can be avoided.
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