[jira] [Work started] (HIVE-14016) Vectorization: VectorGroupByRollupOperator and VectorGroupByCubeOperator

["Matt McCline (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-14016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-14016 started by Matt McCline.
-------------------------------------------
> 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
>            Assignee: Matt McCline
>
> 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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