XiangpengHao commented on code in PR #11662:
URL: https://github.com/apache/datafusion/pull/11662#discussion_r1693060380
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datafusion/functions/src/utils.rs:
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@@ -41,8 +41,8 @@ macro_rules! get_optimal_return_type {
DataType::LargeUtf8 | DataType::LargeBinary => $largeUtf8Type,
// Binary inputs are automatically coerced to Utf8
DataType::Utf8 | DataType::Binary => $utf8Type,
- // Utf8View inputs will yield Utf8View outputs
- DataType::Utf8View => DataType::Utf8View,
+ // Utf8View max offset size is u32::MAX, the same as UTF8
Review Comment:
Used in string related `ScalarUDF`s, for example:
https://github.com/XiangpengHao/datafusion/blob/string-view2-local/datafusion/functions/src/unicode/character_length.rs#L70
I added a small unit test to the function.
Note that there are a bunch of string related functions that only accepts
`Utf8` and `LargeUtf8`, we currently rely on coerce rules to cast them, which
won't panic but may be slower than it should be. I think we should add native
support to `Utf8View`, I'm working on it.
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