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# name: test/sql/function/string/test_concat_ws.test
# description: CONCAT_WS test
# group: [string]
statement ok
PRAGMA enable_verification
statement ok
CREATE TABLE strings(a STRING, b STRING)
statement ok
INSERT INTO strings VALUES ('Hello', 'World'), ('HuLlD', NULL), ('MotörHead','RÄcks')
query T
select CONCAT_WS(',',a, 'SUFFIX') FROM strings
----
Hello,SUFFIX
HuLlD,SUFFIX
MotörHead,SUFFIX
query T
select CONCAT_WS('@','PREFIX', b) FROM strings
----
PREFIX@World
PREFIX
PREFIX@RÄcks
query T
select CONCAT_WS('$',a, b) FROM strings
----
Hello$World
HuLlD
MotörHead$RÄcks
query T
select CONCAT_WS(a, b, 'SUFFIX') FROM strings
----
WorldHelloSUFFIX
SUFFIX
RÄcksMotörHeadSUFFIX
query T
select CONCAT_WS(a, b, b) FROM strings
----
WorldHelloWorld
(empty)
RÄcksMotörHeadRÄcks
query T
select CONCAT_WS('@','1', '2', '3', '4', '5', '6', '7', '8', '9')
----
1@2@3@4@5@6@7@8@9
query T
select CONCAT_WS(b, '[', ']') FROM strings ORDER BY a
----
[World]
NULL
[RÄcks]
# filters
query T
select CONCAT_WS(',', a, 'SUFFIX') FROM strings WHERE a != 'Hello'
----
HuLlD,SUFFIX
MotörHead,SUFFIX
# concat WS needs at least two parameters
statement error
select CONCAT_WS()
----
statement error
select CONCAT_WS(',')
----
# one entry: just returns the entry
query T
select CONCAT_WS(',', 'hello')
----
hello
# NULL in separator results in null
query T
select CONCAT_WS(NULL, 'hello')
----
NULL
# NULL in data results in empty string
query T
select CONCAT_WS(',', NULL)
----
(empty)
# NULL separator returns in entire column being NULL
query T
select CONCAT_WS(NULL, b, 'SUFFIX') FROM strings
----
NULL
NULL
NULL
# NULL in separator is just ignored
query T
select CONCAT_WS(',', NULL, 'SUFFIX') FROM strings
----
SUFFIX
SUFFIX
SUFFIX
# empty strings still get split up by the separator
query T
select CONCAT_WS(',', '', '')
----
,
query T
select CONCAT_WS(',', '', '', '')
----
,,
# but NULLs do not
query T
select CONCAT_WS(',', NULL, NULL)
----
(empty)
query T
select CONCAT_WS(',', NULL, NULL, NULL)
----
(empty)
query T
select CONCAT_WS(',', NULL, NULL, 'hello')
----
hello
# now test for non-constant separators
query T
select CONCAT_WS(a, '', NULL, '') FROM strings ORDER BY a
----
Hello
HuLlD
MotörHead
query T
select CONCAT_WS(a, NULL, '', '') FROM strings ORDER BY a;
----
Hello
HuLlD
MotörHead
# now non-constant separator with a mix of constant and non-constant strings to concatenate
query T
select CONCAT_WS(a, NULL, b, '') FROM strings ORDER BY a
----
WorldHello
(empty)
RÄcksMotörHead
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