Gopal V created HIVE-14016:
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Summary: Vectorization: VectorGroupByRollupOperator and
VectorGroupByCubeOperator
Key: HIVE-14016
URL: https://issues.apache.org/jira/browse/HIVE-14016
Project: Hive
Issue Type: Improvement
Components: Vectorization
Reporter: Gopal V
Rollup and Cube queries are not vectorized today due to the miss of
grouping-sets inside vector group by.
The cube and rollup operators can be shimmed onto the end of the pipeline by
converting a single row writer into a multiple row writer.
The corresponding non-vec loop is as follows
{code}
if (groupingSetsPresent) {
Object[] newKeysArray = newKeys.getKeyArray();
Object[] cloneNewKeysArray = new Object[newKeysArray.length];
for (int keyPos = 0; keyPos < groupingSetsPosition; keyPos++) {
cloneNewKeysArray[keyPos] = newKeysArray[keyPos];
}
for (int groupingSetPos = 0; groupingSetPos < groupingSets.size();
groupingSetPos++) {
for (int keyPos = 0; keyPos < groupingSetsPosition; keyPos++) {
newKeysArray[keyPos] = null;
}
FastBitSet bitset = groupingSetsBitSet[groupingSetPos];
// Some keys need to be left to null corresponding to that grouping
set.
for (int keyPos = bitset.nextSetBit(0); keyPos >= 0;
keyPos = bitset.nextSetBit(keyPos+1)) {
newKeysArray[keyPos] = cloneNewKeysArray[keyPos];
}
newKeysArray[groupingSetsPosition] =
newKeysGroupingSets[groupingSetPos];
processKey(row, rowInspector);
}
}
{code}
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