should be it

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

@@ -0,0 +1,168 @@
+# name: test/sql/aggregate/aggregates/test_median.test
+# description: Test MEDIAN aggregate
+# group: [aggregates]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+PRAGMA verify_external
+
+# scalar quantiles
+query II
+SELECT median(NULL), median(1)
+----
+NULL	1
+
+query II
+SELECT median(NULL), median(1) FROM range(2000)
+----
+NULL	1
+
+statement ok
+create table quantile as select range r, random() from range(10000) union all values (NULL, 0.1), (NULL, 0.5), (NULL, 0.9) order by 2;
+
+query I
+SELECT median(r)::VARCHAR FROM quantile
+----
+4999.5
+
+query R
+SELECT median(r::float)::VARCHAR FROM quantile
+----
+4999.5
+
+query R
+SELECT median(r::double)::VARCHAR FROM quantile
+----
+4999.5
+
+query I
+SELECT median(r::tinyint)::VARCHAR FROM quantile where r < 100
+----
+49.5
+
+query I
+SELECT median(r::smallint)::VARCHAR FROM quantile
+----
+4999.5
+
+query I
+SELECT median(r::integer)::VARCHAR FROM quantile
+----
+4999.5
+
+query I
+SELECT median(r::bigint)::VARCHAR FROM quantile
+----
+4999.5
+
+query I
+SELECT median(r::hugeint)::VARCHAR FROM quantile
+----
+4999.5
+
+query I
+SELECT median(r::decimal(10,2))::VARCHAR FROM quantile
+----
+4999.50
+
+query I
+SELECT median(case when r is null then null else [r] end)::VARCHAR FROM quantile
+----
+[4999]
+
+query I
+SELECT median(case when r is null then null else {'i': r} end)::VARCHAR FROM quantile
+----
+{'i': 4999}
+
+# sorting order is different for varchars and numbers
+# so a different result here is expected
+query I
+SELECT median(r::varchar) FROM quantile
+----
+5498
+
+# adding a prefix
+query I
+SELECT median(case when r is null then null else concat('thishasalongprefix_', r::varchar) end) FROM quantile
+----
+thishasalongprefix_5498
+
+query I
+SELECT median(NULL) FROM quantile
+----
+NULL
+
+query I
+SELECT median(42) FROM quantile
+----
+42
+
+
+#
+# Validate even number of values for all types.
+#
+
+# Interpolated
+foreach type <integral> DECIMAL(4,1) DECIMAL(9,1) DECIMAL(18,1) DECIMAL(38,1) float double
+
+# We don't need to cast these values because 
+# they are too small for the 1% floating point margin to affect the result
+query I
+SELECT MEDIAN(range::${type})
+FROM range(0,10);
+----
+4.5
+
+endloop
+
+foreach type date timestamp timestamp_s timestamp_ms timestamp_ns
+
+query I
+SELECT MEDIAN(range::${type}) 
+FROM range('2024-01-01'::date, '2024-01-11'::date, INTERVAL 1 DAY);
+----
+2024-01-05 12:00:00
+
+endloop
+
+query I
+SELECT MEDIAN(range::timestamptz) 
+FROM range('2024-01-01'::date, '2024-01-11'::date, INTERVAL 1 DAY);
+----
+2024-01-05 12:00:00+00
+
+query I
+SELECT MEDIAN('00:00:00'::TIME + INTERVAL (range) HOUR)
+FROM range(0,10);
+----
+04:30:00
+
+query I
+SELECT MEDIAN(ttz::TIMETZ)
+FROM (VALUES 
+	('00:00:00-09'),
+	('00:00:00-08'),
+	('00:00:00-07'),
+	('00:00:00-06'),
+	('00:00:00-05'),
+	('00:00:00-04'),
+	('00:00:00-03'),
+	('00:00:00-02'),
+	('00:00:00-01'),
+	('00:00:00+00'),
+) tbl(ttz);
+----
+00:00:00-04:30
+
+# Floored
+foreach type varchar
+
+query I
+SELECT MEDIAN(range::${type}) FROM range(0,10);
+----
+4
+
+endloop