Hi export
it looks like there is a hot spot in VectorizedRleValuesReader#readNextGroup
()
case PACKED:
int numGroups = header >>> 1;
this.currentCount = numGroups * 8;
if (this.currentBuffer.length < this.currentCount) {
this.currentBuffer = new int[this.currentCount];
}
currentBufferIdx = 0;
int valueIndex = 0;
while (valueIndex < this.currentCount) {
// values are bit packed 8 at a time, so reading bitWidth will always work
ByteBuffer buffer = in.slice(bitWidth);
this.packer.unpack8Values(buffer, buffer.position(),
this.currentBuffer, valueIndex);
valueIndex += 8;
}
Per my profile, the codes will spend 30% time of readNextGrou() on slice ，
why we can't call slice out of the loop？
