Minor: add "clickbench extended" queries to unit tests (#11763)

Author: alamb

benchmarks/queries/clickbench/README.md

@@ -14,7 +14,7 @@ ClickBench is focused on aggregation and filtering performance (though it has no
 
 The "extended" queries are not part of the official ClickBench benchmark.
 Instead they are used to test other DataFusion features that are not covered by
-the standard benchmark  Each description below is for the corresponding line in
+the standard benchmark. Each description below is for the corresponding line in
 `extended.sql` (line 1 is `Q0`, line 2 is `Q1`, etc.)
 
 ### Q0: Data Exploration

datafusion/sqllogictest/test_files/clickbench.slt

@@ -274,5 +274,23 @@ query PI
 SELECT DATE_TRUNC('minute', to_timestamp_seconds("EventTime")) AS M, COUNT(*) AS PageViews FROM hits WHERE "CounterID" = 62 AND "EventDate"::INT::DATE >= '2013-07-14' AND "EventDate"::INT::DATE <= '2013-07-15' AND "IsRefresh" = 0 AND "DontCountHits" = 0 GROUP BY DATE_TRUNC('minute', to_timestamp_seconds("EventTime")) ORDER BY DATE_TRUNC('minute', M) LIMIT 10 OFFSET 1000;
 ----
 
+# Clickbench "Extended" queries that test count distinct
+
+query III
+SELECT COUNT(DISTINCT "SearchPhrase"), COUNT(DISTINCT "MobilePhone"), COUNT(DISTINCT "MobilePhoneModel") FROM hits;
+----
+1 1 1
+
+query III
+SELECT COUNT(DISTINCT "HitColor"), COUNT(DISTINCT "BrowserCountry"), COUNT(DISTINCT "BrowserLanguage")  FROM hits;
+----
+1 1 1
+
+query TIIII
+SELECT "BrowserCountry",  COUNT(DISTINCT "SocialNetwork"), COUNT(DISTINCT "HitColor"), COUNT(DISTINCT "BrowserLanguage"), COUNT(DISTINCT "SocialAction") FROM hits GROUP BY 1 ORDER BY 2 DESC LIMIT 10;
+----
+� 1 1 1 1
+
+
 statement ok
 drop table hits;