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unpeel group by 3 ways to enable vectorization #7949

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Jan 4, 2022
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unpeel group by 3 ways to enable vectorization #7949

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49 changes: 41 additions & 8 deletions ...ava/org/apache/pinot/core/query/aggregation/groupby/DictionaryBasedGroupKeyGenerator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -257,19 +257,52 @@ private class ArrayBasedHolder implements RawKeyHolder {

@Override
public void processSingleValue(int numDocs, int[] outGroupIds) {
if (_numGroupByExpressions == 1) {
processSingleValue(numDocs, _singleValueDictIds[0], outGroupIds);
} else {
processSingleValueGeneric(numDocs, outGroupIds);
switch (_numGroupByExpressions) {
case 1:
processSingleValue(numDocs, _singleValueDictIds[0], outGroupIds);
return;
case 2:
processSingleValue(numDocs, _singleValueDictIds[0], _singleValueDictIds[1], outGroupIds);
return;
case 3:
processSingleValue(numDocs, _singleValueDictIds[0], _singleValueDictIds[1], _singleValueDictIds[2],
outGroupIds);
return;
default:
}
processSingleValueGeneric(numDocs, outGroupIds);
}

private void processSingleValue(int numDocs, int[] dictIds, int[] outGroupIds) {
System.arraycopy(dictIds, 0, outGroupIds, 0, numDocs);
for (int i = 0; i < numDocs && _numKeys < _globalGroupIdUpperBound; i++) {
if (!_flags[outGroupIds[i]]) {
_numKeys++;
_flags[outGroupIds[i]] = true;
markGroups(numDocs, outGroupIds);
}

private void processSingleValue(int numDocs, int[] dictIds0, int[] dictIds1, int[] outGroupIds) {
for (int i = 0; i < numDocs; i++) {
outGroupIds[i] = dictIds1[i] * _cardinalities[0] + dictIds0[i];
}
markGroups(numDocs, outGroupIds);
}

private void processSingleValue(int numDocs, int[] dictIds0, int[] dictIds1, int[] dictIds2, int[] outGroupIds) {
int cardinality = _cardinalities[0] * _cardinalities[1];
for (int i = 0; i < numDocs; i++) {
outGroupIds[i] = dictIds2[i] * cardinality + dictIds1[i] * _cardinalities[0] + dictIds0[i];
}
markGroups(numDocs, outGroupIds);
}

private void markGroups(int numDocs, int[] groupIds) {
if (_numKeys < _globalGroupIdUpperBound) {
for (int i = 0; i < numDocs; i++) {
if (!_flags[groupIds[i]]) {
_numKeys++;
_flags[groupIds[i]] = true;
if (_numKeys == _globalGroupIdUpperBound) {
return;
}
}
}
}
}
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