# name: test/sql/function/string/test_instr.test
# description: Instr test
# group: [string]

statement ok
PRAGMA enable_verification

statement ok
CREATE TABLE strings(s VARCHAR, off INTEGER, length INTEGER);

statement ok
INSERT INTO strings VALUES ('hello', 1, 2), ('world', 2, 3), ('b', 1, 1), (NULL, 2, 2)

# Test first letter
query I
SELECT instr(s,'h') FROM strings
----
1
0
0
NULL

# position is an alias for instr
query I
SELECT position('h' in s) FROM strings
----
1
0
0
NULL

# Test second letter
query I
SELECT instr(s,'e') FROM strings
----
2
0
0
NULL

# Test last letter
query I
SELECT instr(s,'d') FROM strings
----
0
5
0
NULL

# Test multiple letters
query I
SELECT instr(s,'he') FROM strings
----
1
0
0
NULL

query I
SELECT position('he' in s) FROM strings
----
1
0
0
NULL

# Test multiple letters in the middle
query I
SELECT instr(s,'ello') FROM strings
----
2
0
0
NULL

# Test multiple letters at the end
query I
SELECT instr(s,'lo') FROM strings
----
4
0
0
NULL

# Test no match
query I
SELECT instr(s,'he-man') FROM strings
----
0
0
0
NULL

# Test matching needle in multiple rows
query IT
SELECT instr(s,'o'),s FROM strings
----
5	hello
2	world
0	b
NULL	NULL

# Test NULL constant in different places
query I
SELECT instr(NULL,'o') FROM strings
----
NULL
NULL
NULL
NULL

query I
SELECT instr(s,NULL) FROM strings
----
NULL
NULL
NULL
NULL

query I
SELECT instr(NULL,NULL) FROM strings
----
NULL
NULL
NULL
NULL