ppadma commented on a change in pull request #1395: DRILL-6629 BitVector split
and transfer does not work correctly for transfer length < 8
URL: https://github.com/apache/drill/pull/1395#discussion_r204918913
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File path:
exec/vector/src/main/java/org/apache/drill/exec/vector/BitVector.java
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@@ -323,7 +323,8 @@ public void splitAndTransferTo(int startIndex, int length,
BitVector target) {
if (length % 8 != 0) {
// start is not byte aligned so we have to copy some bits from the
last full byte read in the
// previous loop
- byte lastButOneByte = byteIPlus1;
+ // if numBytesHoldingSourceBits == 1, lastButOneByte is the first
byte, but we have not read it yet, so read it
+ byte lastButOneByte = (numBytesHoldingSourceBits == 1) ?
this.data.getByte(firstByteIndex) : byteIPlus1;
Review comment:
@bitblender I think there could be a problem here. please check. If you are
copying say from firstBitOffset 2, length 4. We want to copy 4 bits only. But,
this might copy 6 bits. bitsFromLastButOneByte will be all bits from
firstBitOffset to the end of the byte.
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