# name: test/sql/function/string/test_mismatches.test
# description: Test mismatches function
# group: [string]

statement ok
SET default_null_order='nulls_first';

statement ok
PRAGMA enable_verification

query I
SELECT mismatches('hallo', 'hallo')
----
0

query I
SELECT mismatches('hello', 'hallo')
----
1

query I
SELECT mismatches('hallo', 'hello')
----
1

query I
SELECT mismatches('aloha', 'hallo')
----
5

query I
SELECT mismatches('hallo', 'aloha')
----
5

query I
SELECT mismatches(NULL, 'hallo')
----
NULL

query I
SELECT mismatches('hello', NULL)
----
NULL

query I
SELECT mismatches(NULL, NULL)
----
NULL



statement ok
CREATE TABLE strings(s VARCHAR)

statement ok
INSERT INTO strings VALUES ('hello'), ('hallo'), ('aloha'), ('world'), (NULL)

# normal counts
query I
SELECT mismatches(s, 'hallo') FROM strings ORDER BY s
----
NULL
5
0
1
4

query I
SELECT mismatches('hallo', s) FROM strings ORDER BY s
----
NULL
5
0
1
4




# special cases

statement error
SELECT mismatches('', '')
----

query I
SELECT mismatches(NULL, s) FROM strings ORDER BY s
----
NULL
NULL
NULL
NULL
NULL

query I
SELECT mismatches(s, NULL) FROM strings ORDER BY s
----
NULL
NULL
NULL
NULL
NULL





# incorrect usages
statement error
SELECT mismatches('hoi', 'hallo')
----

statement error
SELECT mismatches('hallo', 'hoi')
----

statement error
SELECT mismatches('', 'hallo')
----

statement error
SELECT mismatches('hi', '')
----

statement error
SELECT mismatches('', s) FROM strings ORDER BY s
----

statement error
SELECT mismatches(s, '') FROM strings ORDER BY s
----


statement ok
DROP TABLE strings

statement ok
CREATE TABLE strings(s VARCHAR)

statement ok
INSERT INTO strings VALUES ('hello'), ('halo'), (NULL)


# incorrect usage

statement error
SELECT mismatches(s, 'hallo') FROM strings
----

statement error
SELECT mismatches('hallo', s) FROM strings
----




query I
SELECT hamming('hallo', 'hallo')
----
0

query I
SELECT hamming('hello', 'hallo')
----
1

query I
SELECT hamming(s, 'hallo') FROM strings WHERE s = 'hello'
----
1



# Comparing fields from two columns row wise

statement ok
DROP TABLE strings;

statement ok
CREATE TABLE strings(s VARCHAR, t VARCHAR)

statement ok
INSERT INTO strings VALUES ('hello', 'world'), ('hallo', 'ola'), ('hello', ''), (NULL, NULL), ('', ''), ('bora', 'bora')

statement error
SELECT s, t, hamming(s, t) hd FROM strings WHERE length(s) = length(t)
----

statement error
SELECT hamming(s, t)  FROM strings
----