ARROW-9977: [Rust] Added min/max of [Large]StringArray #8215
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Rebased. |
alamb
approved these changes
Sep 18, 2020
| return None | ||
| } | ||
| let mut n = ""; | ||
| let mut has_value = false; |
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I think you could also use an option here rather than a flag + value.
So something like let mut n = None;
And then instead of
has_value = true;
n = item;
something like
n = Some(item);
| } | ||
| } | ||
| } | ||
| Some(n) |
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then you could return n directly
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This was merged as part of #8172 and will thus be closed. I also marked the respective Jira issue as done. |
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Note that, contrarily to horizontal operations, that we can represent as
f(&ArrayRef) -> ArrayRef, in vertical operations likeminandsum, we do not have a dynamically-typed struct to return, and thus need to have a function signature for each type. :(I wonder if we could have in Rust a dynamically struct for single values, like DataFusion has ScalarValue.