should be it

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

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+# name: test/sql/aggregate/aggregates/test_avg.test
+# description: Test AVG operator
+# group: [aggregates]
+
+# scalar average
+query RR
+SELECT AVG(3), AVG(NULL)
+----
+3
+NULL
+
+query RR
+SELECT AVG(3::SMALLINT), AVG(NULL::SMALLINT)
+----
+3
+NULL
+
+query RR
+SELECT AVG(3::DOUBLE), AVG(NULL::DOUBLE)
+----
+3
+NULL
+
+# test average on sequence
+statement ok
+CREATE SEQUENCE seq;
+
+query R
+SELECT AVG(nextval('seq'))
+----
+1
+
+query R
+SELECT AVG(nextval('seq'))
+----
+2
+
+statement ok
+CREATE TABLE integers(i INTEGER);
+
+statement ok
+INSERT INTO integers VALUES (1), (2), (3)
+
+query RRRR
+SELECT AVG(i), AVG(1), AVG(DISTINCT i), AVG(NULL) FROM integers
+----
+2
+1
+2
+NULL
+
+query R
+SELECT AVG(i) FROM integers WHERE i > 100
+----
+NULL
+
+# Intervals
+statement ok
+CREATE TABLE intervals(itvl INTERVAL)
+
+statement ok
+INSERT INTO intervals VALUES 
+	('1 day'), 
+	('30 days'), 
+	('30 days'), 
+	('30 days'), 
+	('30 days')
+
+query II
+SELECT AVG(itvl), AVG(DISTINCT itvl) FROM intervals
+----
+24 days 04:48:00	15 days 12:00:00
+
+# The only test of AVG(INTERVAL) in the PG test suite...
+statement ok
+CREATE TABLE interval_tbl (f1 interval);
+
+statement ok
+INSERT INTO interval_tbl (f1) VALUES 
+	('@ 1 minute'),
+	('@ 5 hour'),
+	('@ 10 day'),
+	('@ 34 year'),
+	('@ 3 months'),
+	('@ 14 seconds ago'),
+	('1 day 2 hours 3 minutes 4 seconds'),
+	('6 years'),
+	('5 months'),
+	('5 months 12 hours');
+
+query I
+select avg(f1) from interval_tbl;
+----
+4 years 1 month 10 days 04:18:23
+
+# invalid use of average
+statement error
+SELECT AVG()
+----
+
+statement error
+SELECT AVG(1, 2, 3)
+----
+
+statement error
+SELECT AVG(AVG(1))
+----
+
+# empty average
+statement ok
+CREATE TABLE vals(i INTEGER, j DOUBLE, k HUGEINT);
+
+statement ok
+INSERT INTO vals VALUES (NULL, NULL, NULL)
+
+query III
+SELECT AVG(i), AVG(j), AVG(k) FROM vals;
+----
+NULL	NULL	NULL
+
+# Temporal values
+statement ok
+CREATE OR REPLACE TABLE timestamps AS 
+	SELECT range AS ts
+	FROM range('2024-11-01'::DATE, '2024-12-01'::DATE, INTERVAL 1 DAY)
+
+query I
+SELECT AVG(ts::DATE) 
+FROM timestamps
+----
+2024-11-15 12:00:00
+
+query I
+SELECT AVG(ts) 
+FROM timestamps
+----
+2024-11-15 12:00:00
+
+query I
+SELECT AVG(ts::TIMESTAMPTZ) 
+FROM timestamps
+----
+2024-11-15 12:00:00+00
+
+statement ok
+CREATE OR REPLACE TABLE times AS 
+	SELECT range AS ts
+	FROM range('2024-11-01'::DATE, '2024-11-02'::DATE, INTERVAL 7 MINUTES)
+
+query I
+SELECT AVG(ts::TIME) 
+FROM times
+----
+11:57:30
+
+# TIMETZ - just average the normalised times
+statement ok
+CREATE TABLE timetzs (ttz TIMETZ);
+
+statement ok
+INSERT INTO timetzs VALUES
+	(NULL),
+	('00:00:00+1559'),
+	('00:00:00+1558'),
+	('02:30:00'),
+	('02:30:00+04'),
+	('02:30:00+04:30'),
+	('02:30:00+04:30:45'),
+	('16:15:03.123456'),
+	('02:30:00+1200'),
+	('02:30:00-1200'),
+	('24:00:00-1558'),
+	('24:00:00-1559'),
+;
+
+query I
+SELECT AVG(ttz) FROM timetzs;
+----
+14:44:56.193041+00