jayapriya surendran created PHOENIX-1772:
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Summary: Add CUBE/ROLLUP/GROUPING SET operators for advanced
aggregations
Key: PHOENIX-1772
URL: https://issues.apache.org/jira/browse/PHOENIX-1772
Project: Phoenix
Issue Type: New Feature
Reporter: jayapriya surendran
I noticed from Phoenix language documentation (
http://phoenix.apache.org/language/index.html ) that Phoenix is missing
CUBE/ROLLUP and GROUPING_SET operators which are already supported by other
similar projects like Apache Pig and Apache Hive. Here is brief overview of my
proposal (the syntax that is proposed below is same as PostgreSQL
https://wiki.postgresql.org/wiki/Grouping_Sets)
*Proposed syntax for CUBE:*
SELECT name, place, SUM(count) FROM cars GROUP BY CUBE(name, place);
For every row that we process we need to emit 2^n combinations of rows where n
corresponds to number of aggregate columns. For the above example query, for
every row we need to emit 4 rows, one for each level of aggregations {(name,
place), (name, *), (*, place), (*, *)}.
*Proposed syntax for ROLLUP:*
SELECT name, place, SUM(count) FROM cars GROUP BY ROLLUP(name, place);
For every row that we process we need to emit n+1 combinations of rows where n
corresponds to number of aggregate columns. For the above example query, for
every row we need to emit 3 rows, one for each hierarchical level of
aggregations {(name, place), (name, *), (*, *)}.
*Propose syntax for GROUPING_SETS:*
SELECT name, place, SUM(count) FROM cars GROUP BY GROUPING SETS(name, ());
For every row that we process we need to emit n combinations of rows where n
corresponds to size of grouping set. For the above example query, for every row
we need to emit 2 rows, one for each specified level of aggregations {(name,
*), (*, *)}
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