Dandandan commented on a change in pull request #2128:
URL: https://github.com/apache/arrow-datafusion/pull/2128#discussion_r840891530
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File path: datafusion/physical-expr/src/string_expressions.rs
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@@ -343,18 +343,17 @@ pub fn concat_ws(args: &[ArrayRef]) -> Result<ArrayRef> {
.enumerate()
.map(|(index, x)| {
x.map(|sep: &str| {
- let mut owned_string: String = "".to_owned();
- for arg_index in 1..args.len() {
- let arg = &args[arg_index];
- if !arg.is_null(index) {
- owned_string.push_str(arg.value(index));
- // if not last push separator
- if arg_index != args.len() - 1 {
- owned_string.push_str(sep);
+ let string_vec = args[1..]
+ .iter()
+ .flat_map(|arg| {
+ if !arg.is_null(index) {
+ vec![arg.value(index)]
+ } else {
+ vec![]
Review comment:
```suggestion
if !arg.is_null(index) {
Some(arg.value(index))
} else {
None
}
```
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