should be it

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

@@ -0,0 +1,135 @@
+# name: test/sql/aggregate/aggregates/test_mad.test
+# description: Test MAD (Moving Absolute Deviation) aggregate
+# group: [aggregates]
+
+statement ok
+PRAGMA enable_verification
+
+# scalar mad is zero
+query II
+SELECT mad(NULL), mad(1)
+----
+NULL	0
+
+# constant mad is zero
+query II
+SELECT mad(NULL), mad(1) FROM range(2000)
+----
+NULL	0
+
+#
+# Small numerics
+#
+statement ok
+create table tinys as
+	select range r, random()
+	from range(100)
+	union all values (NULL, 0.1), (NULL, 0.5), (NULL, 0.9)
+	order by 2;
+
+foreach type tinyint decimal(4,1)
+
+query I
+SELECT mad(r::${type}) FROM tinys
+----
+25
+
+query I
+SELECT mad(NULL::${type}) FROM tinys
+----
+NULL
+
+query I
+SELECT mad(42::${type}) FROM tinys
+----
+0
+
+endloop
+
+#
+# Large numerics
+#
+statement ok
+create table numerics as
+	select range r, random()
+	from range(10000)
+	union all values (NULL, 0.1), (NULL, 0.5), (NULL, 0.9)
+	order by 2;
+
+foreach type smallint integer bigint hugeint uhugeint float double decimal(8,1) decimal(12,1) decimal(18,1) decimal(24,1)
+
+query I
+SELECT mad(r::${type}) FROM numerics
+----
+2500
+
+query I
+SELECT mad(NULL::${type}) FROM numerics
+----
+NULL
+
+query I
+SELECT mad(42::${type}) FROM numerics
+----
+0
+
+endloop
+
+#
+# Temporal
+#
+
+query I
+SELECT mad(('2018-01-01'::DATE + INTERVAL (r) DAY)::DATE) FROM numerics
+----
+2500 days
+
+query I
+SELECT mad('2018-01-01'::TIMESTAMP + INTERVAL (r) HOUR) FROM numerics
+----
+104 days 04:00:00
+
+query I
+SELECT mad('00:00:00'::TIME + INTERVAL (r) SECOND) FROM numerics
+----
+00:41:40
+
+#
+# Extreme values
+#
+
+query I
+select mad(x) from (values ('127'::DECIMAL(3,0)), ('-128'::DECIMAL(3,0))) tbl(x);
+----
+127
+
+query I
+select mad(x) from (values ('32767'::DECIMAL(5,0)), ('-32768'::DECIMAL(5,0))) tbl(x);
+----
+32767
+
+query I
+select mad(x) from (values ('2147483647'::DECIMAL(10,0)), ('-2147483648'::DECIMAL(10,0))) tbl(x);
+----
+2147483647
+
+statement ok
+select mad(x) from (values (-1e308), (1e308)) tbl(x);
+
+query I
+select mad(x) from (values ('294247-01-10'::date), ('290309-12-22 (BC)'::date)) tbl(x);
+----
+106751991 days
+
+query I
+select mad(x) from (values
+	('294247-01-10 04:00:54.775806'::timestamp),
+	('290309-12-22 (BC) 00:00:00'::timestamp)
+	) tbl(x);
+----
+106751991 days 02:00:27.387903
+
+query I
+select mad(x) from (values ('23:59:59.999999'::time), ('00:00:00'::time)) tbl(x);
+----
+12:00:00