ovr commented on a change in pull request #1660:
URL: https://github.com/apache/arrow-datafusion/pull/1660#discussion_r790733421
##########
File path: datafusion/src/physical_plan/functions.rs
##########
@@ -3680,6 +3704,60 @@ mod tests {
StringArray
);
#[cfg(feature = "unicode_expressions")]
+ test_function!(
Review comment:
You are right, i did another iteration and looks like I found a way how
to get similar behaviour
PG:
```
select substr('alphabet', 0, 5) as s1, substr('alphabet', -5, 10) as s2,
substr('alphabet', -5, 4) as s3;
[
{
"s1": "alph",
"s2": "alph",
"s3": ""
}
]
```
DF:
```
❯ select substr('alphabet', 0, 5) as s1, substr('alphabet', -5, 10) as s2,
substr('alphabet', -5, 4) as s3;
+------+------+----+
| s1 | s2 | s3 |
+------+------+----+
| alph | alph | |
+------+------+----+
1 row in set. Query took 0.016 seconds.
```
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