alamb commented on code in PR #11995:
URL: https://github.com/apache/datafusion/pull/11995#discussion_r1717505404
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datafusion/physical-expr/src/expressions/binary/kernels.rs:
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@@ -27,8 +27,34 @@ use arrow::datatypes::DataType;
use datafusion_common::internal_err;
use datafusion_common::{Result, ScalarValue};
+use arrow_schema::ArrowError;
use std::sync::Arc;
+/// Returns the elementwise concatenation of a [`StringViewArary`].
+///
+/// An index of the resulting [`StringViewArray`] is null if any of
+/// `StringViewArary` are null at that location.
+///
+/// ```text
+/// e.g:
+///
+/// ["Hello"] + ["World"] = ["HelloWorld"]
+///
+/// ["a", "b"] + [None, "c"] = [None, "bc"]
+/// ```
+///
+/// An error will be returned if `left` and `right` have different lengths
+///
+/// TODO: port this upstream to arrow-rs (TODO FILE TICKET AND REFERENCE HERE)
Review Comment:
The idea would be to fill out this function (and eventually port it upstream
to arrow-rs)
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