kasakrisz commented on code in PR #6582:
URL: https://github.com/apache/hive/pull/6582#discussion_r3726386095
##########
ql/src/test/queries/clientpositive/count_distinct_multi_col.q:
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@@ -0,0 +1,80 @@
+create table t (col1 string, col2 int, col3 int, col4 date);
+
+insert into t values
+ ('a', 1, 2, '2022-01-01'),
+ ('a', 1, 2, '2022-01-01'),
+ ('a', 1, 2, '2022-01-02'),
+ ('a', 1, 22, '2022-01-02'),
+ ('a', 11, 2, '2022-01-01'),
+ ('a', 11, 2, '2022-01-02');
+
+-- single-column: HiveExpandDistinctAggregatesRule matched -> two
HiveAggregate operators in plan
+explain cbo
+SELECT col1, col2, COUNT(DISTINCT col3) AS cnt
+FROM t
+GROUP BY col1, col2;
+
+SELECT col1, col2, COUNT(DISTINCT col3) AS cnt
+FROM t
+GROUP BY col1, col2
+ORDER BY col1, col2;
+
+-- multi-column: HiveExpandDistinctAggregatesRule !matched -> single
HiveAggregate operator
+explain cbo
+SELECT col1, col2, COUNT(DISTINCT col3, col4) AS cnt
+FROM t
+GROUP BY col1, col2;
+
+SELECT col1, col2, COUNT(DISTINCT col3, col4) AS cnt
+FROM t
+GROUP BY col1, col2
+ORDER BY col1, col2;
+
+-- 3-column: HiveExpandDistinctAggregatesRule !matched -> single HiveAggregate
operator
+explain cbo
+SELECT col1, COUNT(DISTINCT col2, col3, col4) AS cnt
Review Comment:
What is the difference in handling 2-column, 3-column, and n-column cases?
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