should be it

external/duckdb/test/sql/aggregate/aggregates/test_histogram.test

@@ -0,0 +1,146 @@
+# name: test/sql/aggregate/aggregates/test_histogram.test
+# description: Test histogram aggregation
+# group: [aggregates]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+PRAGMA verify_external
+
+query I
+select histogram(NULL)
+----
+NULL
+
+# Empty Table
+query I
+SELECT histogram(i) FROM range(100) tbl(i) WHERE 1=0;
+----
+NULL
+
+query I
+select histogram(1)
+----
+{1=1}
+
+# Allow ascii characters in strings
+query I
+SELECT histogram('、')
+----
+{、=1}
+
+query I
+SELECT histogram(2) FROM range(100);
+----
+{2=100}
+
+statement ok
+CREATE TABLE hist_data (g INTEGER, e INTEGER)
+
+statement ok
+INSERT INTO hist_data VALUES (1, 1), (1, 2), (2, 3), (2, 4), (2, 5), (3, 6), (5, NULL)
+
+
+query T
+SELECT histogram(g) from hist_data
+----
+{1=2, 2=3, 3=1, 5=1}
+
+query T
+SELECT histogram(e) from hist_data
+----
+{1=1, 2=1, 3=1, 4=1, 5=1, 6=1}
+
+query I
+select histogram(g)
+    from hist_data
+    group by g%2==0 ORDER BY g%2==0
+----
+{1=2, 3=1, 5=1}
+{2=3}
+
+query I
+select histogram(g)
+    from hist_data
+    where g < 3
+----
+{1=2, 2=3}
+
+statement ok
+create table names (name string)
+
+statement ok
+insert into names values ('pedro'), ('pedro'), ('pedro'),('hannes'),('hannes'),('mark'),(null),('Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr.');
+
+query I
+select histogram(name) from names;
+----
+{Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr.=1, hannes=2, mark=1, pedro=3}
+
+# Variant time type binding (Issue #3290)
+query I
+SELECT histogram(CAST('2021-08-20' AS TIMESTAMP_S));
+----
+{'2021-08-20 00:00:00'=1}
+
+query I
+SELECT histogram(CAST('2021-08-20' AS TIMESTAMP_MS));
+----
+{'2021-08-20 00:00:00'=1}
+
+query I
+SELECT histogram(CAST('2021-08-20' AS TIMESTAMP_NS));
+----
+{'2021-08-20 00:00:00'=1}
+
+query I
+SELECT histogram(CAST('15:05:42' AS TIME));
+----
+{'15:05:42'=1}
+
+query I
+SELECT histogram(CAST('15:05:42+00' AS TIME WITH TIME ZONE));
+----
+{'15:05:42+00'=1}
+
+query I
+SELECT histogram(CAST('2022-01-02' AS DATE));
+----
+{2022-01-02=1}
+
+query II rowsort
+select g,histogram(g) over (partition by g%2)
+    from hist_data;
+----
+1	{1=2, 3=1, 5=1}
+1	{1=2, 3=1, 5=1}
+2	{2=3}
+2	{2=3}
+2	{2=3}
+3	{1=2, 3=1, 5=1}
+5	{1=2, 3=1, 5=1}
+
+#Corner cases
+statement error
+select histogram()
+----
+
+statement error
+select histogram(*)
+----
+
+# enums
+statement ok
+CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy')
+
+statement ok
+CREATE TABLE enums (e mood)
+
+statement ok
+INSERT INTO enums VALUES ('happy'), ('ok')
+
+query I
+SELECT histogram(e) FROM enums
+----
+{ok=1, happy=1}