Vova Vysotskyi created DRILL-8381:
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Summary: Add support for filtered aggregate calls
Key: DRILL-8381
URL: https://issues.apache.org/jira/browse/DRILL-8381
Project: Apache Drill
Issue Type: New Feature
Reporter: Vova Vysotskyi
Assignee: Vova Vysotskyi
Currently, Drill ignores filters for filtered aggregate calls and returns
incorrect results.
Here is the example query for which Drill will return incorrect results:
{code:sql}
SELECT count(n_name) FILTER(WHERE n_regionkey = 1) AS nations_count_in_1_region,
count(n_name) FILTER(WHERE n_regionkey = 2) AS nations_count_in_2_region,
count(n_name) FILTER(WHERE n_regionkey = 3) AS nations_count_in_3_region,
count(n_name) FILTER(WHERE n_regionkey = 4) AS nations_count_in_4_region,
count(n_name) FILTER(WHERE n_regionkey = 0) AS nations_count_in_0_region
FROM cp.`tpch/nation.parquet`
{code}
{noformat}
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
| nations_count_in_1_region | nations_count_in_2_region |
nations_count_in_3_region | nations_count_in_4_region |
nations_count_in_0_region |
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
| 25 | 25 | 25
| 25 | 25 |
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
{noformat}
But correct result is
{noformat}
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
| nations_count_in_1_region | nations_count_in_2_region |
nations_count_in_3_region | nations_count_in_4_region |
nations_count_in_0_region |
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
| 5 | 5 | 5
| 5 | 5 |
+---------------------------+---------------------------+---------------------------+---------------------------+---------------------------+
{noformat}
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