siddharthteotia commented on a change in pull request #7949:
URL: https://github.com/apache/pinot/pull/7949#discussion_r774743558
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/groupby/DictionaryBasedGroupKeyGenerator.java
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@@ -257,19 +257,46 @@ public int getNumKeys() {
@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);
+ 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];
Review comment:
Should we try to use the FMA instruction to do this. I think in JDK 11,
for `Math.fma() `JIT uses the Intel compiler intrinsics underneath for the
SIMD instruction corresponding to FMA (`vfmadd231ps`)
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