# name: test/sql/function/string/test_trim.test
# description: LTRIM/RTRIM/TRIM test
# group: [string]

statement ok
PRAGMA enable_verification

# test ltrim on scalars
query TTTTTTT
select LTRIM(''), LTRIM('Neither'), LTRIM(' Leading'), LTRIM('Trailing   '), LTRIM(' Both '), LTRIM(NULL), LTRIM('     ')
----
(empty)	Neither	Leading	Trailing   	Both 	NULL	(empty)

# test rtrim on scalars
query TTTTTTT
select RTRIM(''), RTRIM('Neither'), RTRIM(' Leading'), RTRIM('Trailing   '), RTRIM(' Both '), RTRIM(NULL), RTRIM('    ')
----
(empty)	Neither	 Leading	Trailing	 Both	NULL	(empty)

# test trim on scalars
query TTTTTTT
select TRIM(''), TRIM('Neither'), TRIM(' Leading'), TRIM('Trailing   '), TRIM(' Both '), TRIM(NULL), TRIM('     ')
----
(empty)	Neither	Leading	Trailing	Both	NULL	(empty)

# test on tables
statement ok
CREATE TABLE strings(a STRING, b STRING)

statement ok
INSERT INTO strings VALUES ('', 'Neither'), (' Leading', NULL), (' Both ','Trailing   '), ('', NULL)

query T
select LTRIM(a) FROM strings
----
(empty)
Leading
Both 
(empty)

query T
select LTRIM(b) FROM strings
----
Neither
NULL
Trailing   
NULL

query T
select LTRIM(a) FROM strings WHERE b IS NOT NULL
----
(empty)
Both 

# test rtrim on tables
query T
select RTRIM(a) FROM strings
----
(empty)
 Leading
 Both
(empty)

query T
select RTRIM(b) FROM strings
----
Neither
NULL
Trailing
NULL

query T
select RTRIM(a) FROM strings WHERE b IS NOT NULL
----
(empty)
 Both

# test ltrim/rtrim/trim with custom trim filter
query TTTTTTT
select LTRIM('', 'ho'), LTRIM('hello', 'ho'), LTRIM('papapapa', 'pa'), LTRIM('blaHblabla', 'bla'), LTRIM('blabla', NULL), LTRIM(NULL, 'blabla'), LTRIM('blabla', '')
----
(empty)	ello	(empty)	Hblabla	NULL	NULL	blabla

query TTTTTTT
select RTRIM('', 'ho'), RTRIM('hello', 'ho'), RTRIM('papapapa', 'pa'), RTRIM('blaHblabla', 'bla'), RTRIM('blabla', NULL), RTRIM(NULL, 'blabla'), RTRIM('blabla', '')
----
(empty)	hell	(empty)	blaH	NULL	NULL	blabla

query TTTTTTT
select TRIM('', 'ho'), TRIM('hello', 'ho'), TRIM('papapapa', 'pa'), TRIM('blaHblabla', 'bla'), TRIM('blabla', NULL), TRIM(NULL, 'blabla'), TRIM('blabla', '')
----
(empty)	ell	(empty)	H	NULL	NULL	blabla

# test on tables
statement ok
CREATE TABLE trim_test(a VARCHAR, b VARCHAR)

statement ok
INSERT INTO trim_test VALUES ('hello', 'ho'), ('test', 't'), ('mühleisen','mün'), (NULL, ' '), ('', NULL), ('', ''), (NULL, NULL)

query TTT
SELECT LTRIM(a, b), RTRIM(a, b), TRIM(a, b) FROM trim_test
----
ello	hell	ell
est	tes	es
hleisen	mühleise	hleise
NULL	NULL	NULL
NULL	NULL	NULL
(empty)	(empty)	(empty)
NULL	NULL	NULL

# test incorrect usage of ltrim/rtrim/trim
statement error
select LTRIM()
----
<REGEX>:.*Binder Error: No function matches.*ltrim().*

statement error
select LTRIM('hello', 'world', 'aaa')
----
<REGEX>:.*Binder Error: No function matches.*ltrim().*

statement error
select RTRIM()
----
<REGEX>:.*Binder Error: No function matches.*rtrim().*

statement error
select RTRIM('hello', 'world', 'aaa')
----
<REGEX>:.*Binder Error: No function matches.*rtrim().*

statement error
select TRIM()
----
Parser Error: syntax error at or near ")"

statement error
select TRIM('hello', 'world', 'aaa')
----
<REGEX>:.*Binder Error: No function matches.*trim().*