martin-g commented on code in PR #19805:
URL: https://github.com/apache/datafusion/pull/19805#discussion_r2693483206
##########
datafusion/spark/src/function/string/mod.rs:
##########
@@ -90,6 +92,11 @@ pub mod expr_fn {
strfmt args
));
export_functions!((space, "Returns a string consisting of n spaces.",
arg1));
+ export_functions!((
+ substring,
+ "Returns the substring from string str starting at position pos with
length len.",
+ str pos
Review Comment:
```suggestion
str pos length
```
?!
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