# The function should return NULL if any of its arguments are NULL.
SELECT LPAD(NULL, 5, 'x') AS result;
result
NULL
SELECT LPAD(NULL, NULL, 'x') AS result;
result
NULL
SELECT LPAD(NULL, NULL, NULL) AS result;
result
NULL
SELECT LPAD('a', NULL, 'x') AS result;
result
NULL
SELECT LPAD('a', NULL, NULL) AS result;
result
NULL
SELECT LPAD('a', 5, NULL) AS result;
result
NULL
SELECT LPAD(NULL, 5, NULL) AS result;
result
NULL
# The function should return an empty string if len is 0.
SELECT LPAD('a', 0, 'x') AS result;
result

SELECT LPAD('a', 0, '') AS result;
result

SELECT LPAD('', 0, 'x') AS result;
result

SELECT LPAD('', 0, '') AS result;
result

# The function should return NULL if len is negative.
SELECT LPAD('a', -1, 'x');
LPAD('a', -1, 'x')
NULL
# Min signed long long int:
SELECT LPAD('a', -9223372036854775808, 'x');
LPAD('a', -9223372036854775808, 'x')
NULL
# Min signed long long int - 1
SELECT LPAD('a', -9223372036854775809, 'x');
LPAD('a', -9223372036854775809, 'x')
NULL
Warnings:
Warning	1292	Truncated incorrect DECIMAL value: '-9223372036854775809'
Warning	1292	Truncated incorrect DECIMAL value: '-9223372036854775809'
# The function should return NULL with a warning if len is larger than
# max_allowed_packet.
# Max signed long long int:
SELECT LPAD('a', 9223372036854775807, 'x');
LPAD('a', 9223372036854775807, 'x')
NULL
Warnings:
Warning	1301	Result of lpad() was larger than max_allowed_packet (67108864) - truncated
# Max signed long long int + 1:
SELECT LPAD('a', 9223372036854775808, 'x');
LPAD('a', 9223372036854775808, 'x')
NULL
Warnings:
Warning	1301	Result of lpad() was larger than max_allowed_packet (67108864) - truncated
# Max unsigned long long int:
SELECT LPAD('a', 18446744073709551615, 'x');
LPAD('a', 18446744073709551615, 'x')
NULL
Warnings:
Warning	1301	Result of lpad() was larger than max_allowed_packet (67108864) - truncated
# Max unsigned long long int + 1:
SELECT LPAD('a', 18446744073709551616, 'x');
LPAD('a', 18446744073709551616, 'x')
NULL
Warnings:
Warning	1292	Truncated incorrect DECIMAL value: '18446744073709551616'
Warning	1292	Truncated incorrect DECIMAL value: '18446744073709551616'
Warning	1301	Result of lpad() was larger than max_allowed_packet (67108864) - truncated
# The function should return an empty string if padstr is empty.
SELECT LPAD('a', 5, '') AS result;
result

SELECT LPAD('a', 5, '') AS result;
result

# The function should do nothing if str is of length len.
SELECT LPAD('12345', 5, 'x');
LPAD('12345', 5, 'x')
12345
# The function should chop the string if len is shorter than the length
# of str.
SELECT LPAD('123456787890', 1, 'x');
LPAD('123456787890', 1, 'x')
1
SELECT LPAD('123456787890', 5, 'x');
LPAD('123456787890', 5, 'x')
12345
# The function should left pad with padstr so that the string is len
# bytes long if str is shorter than len.
SELECT LPAD('123', 5, 'x');
LPAD('123', 5, 'x')
xx123
# The function should repeat padstr also if it has mulitplie characters.
SELECT LPAD('a', 5, 'xy');
LPAD('a', 5, 'xy')
xyxya