pub fn left(s: &str, n: i32, writer: &mut impl Write)Expand description
Returns the first n characters in the string. If n is a negative value, the function will return all but last |n| characters.
ยงExample
query T
select left('RisingWave', 6)
----
Rising
query T
select left('RisingWave', 42)
----
RisingWave
query T
select left('RisingWave', 0)
----
(empty)
query T
select left('RisingWave', -4)
----
Rising
query T
select left('RisingWave', -2147483648);
----
(empty)