doki23 commented on pull request #2128:
URL:
https://github.com/apache/arrow-datafusion/pull/2128#issuecomment-1083964337
How about
```
let mut owned_string = Vec::with_capacity(args.len());
for arg_index in 1..args.len() {
let arg = &args[arg_index];
if !arg.is_null(index) {
owned_string.push(arg.value(index));
}
}
owned_string.join(sep)
```
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