alamb commented on code in PR #12224:
URL: https://github.com/apache/datafusion/pull/12224#discussion_r1740777076
##########
datafusion/functions/src/string/concat.rs:
##########
@@ -64,13 +66,36 @@ impl ScalarUDFImpl for ConcatFunc {
&self.signature
}
- fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
- Ok(Utf8)
+ fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
+ use DataType::*;
+ let mut dt = &Utf8;
+ arg_types.iter().for_each(|data_type| {
+ if data_type == &Utf8View {
+ dt = data_type;
+ }
+ if data_type == &LargeUtf8 && dt != &Utf8View {
Review Comment:
👍
##########
datafusion/functions/src/string/common.rs:
##########
@@ -418,6 +448,148 @@ impl StringArrayBuilder {
}
}
+pub(crate) struct StringViewArrayBuilder {
+ builder: StringViewBuilder,
+ block: String
+}
+
+impl StringViewArrayBuilder {
Review Comment:
I think the original intent of `StringViewBuilder` when @JasonLi-cn added it
was to have a way to append (but not complete) strings to avoid a copy and not
incrementally update the null mask.
Specifically, StringBuilder in arrow
https://docs.rs/arrow/latest/arrow/array/type.StringBuilder.html#method.append_value
lets you append an entire string but it requires the input be contiguous bytes
`StringArrayBuilder` is that you can push bytes (via `write`) wthout copying
the data.
The reason I think it feels hacky is that the API for building up single
values in a StringArray or StringViewArray without a copy is not present
As we see we want to do the same thing with `Utf8View` I wonder if we should
spend some time making the API eaiser to use 🤔
##########
datafusion/functions/src/string/common.rs:
##########
@@ -418,6 +448,148 @@ impl StringArrayBuilder {
}
}
+pub(crate) struct StringViewArrayBuilder {
+ builder: StringViewBuilder,
+ block: String
+}
+
+impl StringViewArrayBuilder {
Review Comment:
I filed https://github.com/apache/arrow-rs/issues/6347 to discuss adding an
API like this in arrow as well
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