/**
* because the field is NULL and it's source is the incoming mutation, we still need to accumulate
* it. We must be careful, however, to accumulate the proper null value.
*
* <p>In theory, we could use a sparse encoding here--just accumulate a length 0 entry, which will
* allow us to use a very short row key to determine nullity. However, that doesn't work
* correctly, because doubles and floats at the end of the index might decode the row key as a
* double, resulting in goofball answers.
*
* <p>Instead, we must use the dense encoding approach here. That means that we must select the
* proper dense type based on columnTypes[i]. For most data types, this is still a length-0 array,
* but for floats and doubles it will put the proper type into place.
*/
private void accumulateNull(EntryAccumulator keyAccumulator, int pos, int type) {
if (typeProvider.isScalar(type))
keyAccumulator.addScalar(pos, SIConstants.EMPTY_BYTE_ARRAY, 0, 0);
else if (typeProvider.isDouble(type))
keyAccumulator.addDouble(
pos, Encoding.encodedNullDouble(), 0, Encoding.encodedNullDoubleLength());
else if (typeProvider.isFloat(type))
keyAccumulator.addDouble(
pos, Encoding.encodedNullFloat(), 0, Encoding.encodedNullFloatLength());
else keyAccumulator.add(pos, SIConstants.EMPTY_BYTE_ARRAY, 0, 0);
}
private boolean skip(MultiFieldDecoder keyDecoder, int sourceKeyColumnType) {
boolean isNull;
if (typeProvider.isScalar(sourceKeyColumnType)) {
isNull = keyDecoder.nextIsNull();
keyDecoder.skipLong();
} else if (typeProvider.isDouble(sourceKeyColumnType)) {
isNull = keyDecoder.nextIsNullDouble();
keyDecoder.skipDouble();
} else if (typeProvider.isFloat(sourceKeyColumnType)) {
isNull = keyDecoder.nextIsNullFloat();
keyDecoder.skipFloat();
} else {
isNull = keyDecoder.nextIsNull();
keyDecoder.skip();
}
return isNull;
}
private void accumulate(
EntryAccumulator keyAccumulator,
int pos,
int type,
boolean reverseOrder,
byte[] array,
int offset,
int length) {
byte[] data = array;
int off = offset;
if (reverseOrder) {
// TODO -sf- could we cache these byte[] somehow?
data = new byte[length];
System.arraycopy(array, offset, data, 0, length);
for (int i = 0; i < data.length; i++) {
data[i] ^= 0xff;
}
off = 0;
}
if (typeProvider.isScalar(type)) keyAccumulator.addScalar(pos, data, off, length);
else if (typeProvider.isDouble(type)) keyAccumulator.addDouble(pos, data, off, length);
else if (typeProvider.isFloat(type)) keyAccumulator.addFloat(pos, data, off, length);
else keyAccumulator.add(pos, data, off, length);
}