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Make lower and upper emit Utf8View for Utf8View input #20616

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Make lower and upper emit Utf8View for Utf8View input #20616

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837f896
Make lower emit Utf8View for Utf8View input
kumarUjjawal Feb 28, 2026
d92a711
Make lower and upper emit Utf8View for Utf8View input
kumarUjjawal Mar 2, 2026
d553ac1
Handle dictionary Utf8View return type in case conversion
kumarUjjawal Mar 2, 2026
825b423
Refine lower/upper Utf8View tests and return typing
kumarUjjawal Mar 3, 2026
5adb958
add dictionary slt tests
kumarUjjawal Mar 3, 2026
4ddfc61
remove case_conversion block
kumarUjjawal Mar 6, 2026
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10 changes: 4 additions & 6 deletions datafusion/functions/src/string/common.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ use std::sync::Arc;
use crate::strings::make_and_append_view;
use arrow::array::{
Array, ArrayRef, GenericStringArray, GenericStringBuilder, NullBufferBuilder,
OffsetSizeTrait, StringBuilder, StringViewArray, new_null_array,
OffsetSizeTrait, StringViewArray, StringViewBuilder, new_null_array,
};
use arrow::buffer::{Buffer, ScalarBuffer};
use arrow::datatypes::DataType;
Expand Down Expand Up @@ -358,10 +358,8 @@ where
>(array, op)?)),
DataType::Utf8View => {
let string_array = as_string_view_array(array)?;
let mut string_builder = StringBuilder::with_capacity(
string_array.len(),
string_array.get_array_memory_size(),
);
let mut string_builder =
StringViewBuilder::with_capacity(string_array.len());

for str in string_array.iter() {
if let Some(str) = str {
Expand All @@ -386,7 +384,7 @@ where
}
ScalarValue::Utf8View(a) => {
let result = a.as_ref().map(|x| op(x));
Ok(ColumnarValue::Scalar(ScalarValue::Utf8(result)))
Ok(ColumnarValue::Scalar(ScalarValue::Utf8View(result)))
}
other => exec_err!("Unsupported data type {other:?} for function {name}"),
},
Expand Down
25 changes: 20 additions & 5 deletions datafusion/functions/src/string/lower.rs
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Expand Up @@ -19,7 +19,6 @@ use arrow::datatypes::DataType;
use std::any::Any;

use crate::string::common::to_lower;
use crate::utils::utf8_to_str_type;
use datafusion_common::Result;
use datafusion_common::types::logical_string;
use datafusion_expr::{
Expand Down Expand Up @@ -82,7 +81,7 @@ impl ScalarUDFImpl for LowerFunc {
}

fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
utf8_to_str_type(&arg_types[0], "lower")
Ok(arg_types[0].clone())
}

fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> {
Expand All @@ -97,8 +96,7 @@ impl ScalarUDFImpl for LowerFunc {
#[cfg(test)]
mod tests {
use super::*;
use arrow::array::{Array, ArrayRef, StringArray};
use arrow::datatypes::DataType::Utf8;
use arrow::array::{Array, ArrayRef, StringArray, StringViewArray};
use arrow::datatypes::Field;
use datafusion_common::config::ConfigOptions;
use std::sync::Arc;
Expand All @@ -111,7 +109,7 @@ mod tests {
number_rows: input.len(),
args: vec![ColumnarValue::Array(input)],
arg_fields,
return_field: Field::new("f", Utf8, true).into(),
return_field: Field::new("f", expected.data_type().clone(), true).into(),
config_options: Arc::new(ConfigOptions::default()),
};

Expand Down Expand Up @@ -197,4 +195,21 @@ mod tests {

to_lower(input, expected)
}

#[test]
fn lower_utf8view() -> Result<()> {
let input = Arc::new(StringViewArray::from(vec![
Some("ARROW"),
None,
Some("TSCHÜSS"),
])) as ArrayRef;

let expected = Arc::new(StringViewArray::from(vec![
Some("arrow"),
None,
Some("tschüss"),
])) as ArrayRef;

to_lower(input, expected)
}
}
25 changes: 20 additions & 5 deletions datafusion/functions/src/string/upper.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,6 @@
// under the License.

use crate::string::common::to_upper;
use crate::utils::utf8_to_str_type;
use arrow::datatypes::DataType;
use datafusion_common::Result;
use datafusion_common::types::logical_string;
Expand Down Expand Up @@ -81,7 +80,7 @@ impl ScalarUDFImpl for UpperFunc {
}

fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
utf8_to_str_type(&arg_types[0], "upper")
Ok(arg_types[0].clone())
}

fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> {
Expand All @@ -96,8 +95,7 @@ impl ScalarUDFImpl for UpperFunc {
#[cfg(test)]
mod tests {
use super::*;
use arrow::array::{Array, ArrayRef, StringArray};
use arrow::datatypes::DataType::Utf8;
use arrow::array::{Array, ArrayRef, StringArray, StringViewArray};
use arrow::datatypes::Field;
use datafusion_common::config::ConfigOptions;
use std::sync::Arc;
Expand All @@ -110,7 +108,7 @@ mod tests {
number_rows: input.len(),
args: vec![ColumnarValue::Array(input)],
arg_fields: vec![arg_field],
return_field: Field::new("f", Utf8, true).into(),
return_field: Field::new("f", expected.data_type().clone(), true).into(),
config_options: Arc::new(ConfigOptions::default()),
};

Expand Down Expand Up @@ -196,4 +194,21 @@ mod tests {

to_upper(input, expected)
}

#[test]
fn upper_utf8view() -> Result<()> {
let input = Arc::new(StringViewArray::from(vec![
Some("arrow"),
None,
Some("tschüß"),
])) as ArrayRef;

let expected = Arc::new(StringViewArray::from(vec![
Some("ARROW"),
None,
Some("TSCHÜSS"),
])) as ArrayRef;

to_upper(input, expected)
}
}
50 changes: 50 additions & 0 deletions datafusion/sqllogictest/test_files/functions.slt
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Original file line number Diff line number Diff line change
Expand Up @@ -435,6 +435,11 @@ SELECT upper(arrow_cast('foo', 'Dictionary(Int32, Utf8)'))
----
FOO

query T
SELECT upper(arrow_cast(arrow_cast('foo', 'Dictionary(Int32, Utf8)'), 'Dictionary(Int32, Utf8View)'))
----
FOO

query T
SELECT upper('árvore ação αβγ')
----
Expand All @@ -445,6 +450,26 @@ SELECT upper(arrow_cast('árvore ação αβγ', 'Dictionary(Int32, Utf8)'))
----
ÁRVORE AÇÃO ΑΒΓ

query T
SELECT arrow_typeof(upper('foo'))
----
Utf8

query T
SELECT arrow_typeof(upper(arrow_cast('foo', 'LargeUtf8')))
----
LargeUtf8

query T
SELECT arrow_typeof(upper(arrow_cast('foo', 'Utf8View')))
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@neilconway neilconway Mar 2, 2026

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Add SLT tests for dictionary with a Utf8View value type?

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@kumarUjjawal kumarUjjawal Mar 3, 2026

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I'm not sure about the new tests i added, can you take a look.

----
Utf8View

query T
SELECT arrow_typeof(upper(arrow_cast(arrow_cast('foo', 'Dictionary(Int32, Utf8)'), 'Dictionary(Int32, Utf8View)')))
----
Utf8View

query T
SELECT btrim(' foo ')
----
Expand Down Expand Up @@ -490,6 +515,11 @@ SELECT lower(arrow_cast('FOObar', 'Dictionary(Int32, Utf8)'))
----
foobar

query T
SELECT lower(arrow_cast(arrow_cast('FOObar', 'Dictionary(Int32, Utf8)'), 'Dictionary(Int32, Utf8View)'))
----
foobar

query T
SELECT lower('ÁRVORE AÇÃO ΑΒΓ')
----
Expand All @@ -500,6 +530,26 @@ SELECT lower(arrow_cast('ÁRVORE AÇÃO ΑΒΓ', 'Dictionary(Int32, Utf8)'))
----
árvore ação αβγ

query T
SELECT arrow_typeof(lower('FOObar'))
----
Utf8

query T
SELECT arrow_typeof(lower(arrow_cast('FOObar', 'LargeUtf8')))
----
LargeUtf8

query T
SELECT arrow_typeof(lower(arrow_cast('FOObar', 'Utf8View')))
----
Utf8View

query T
SELECT arrow_typeof(lower(arrow_cast(arrow_cast('FOObar', 'Dictionary(Int32, Utf8)'), 'Dictionary(Int32, Utf8View)')))
----
Utf8View

query T
SELECT ltrim(' foo')
----
Expand Down