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Allocate a buffer of the correct length for ScalarValue::FixedSizeBinary in ScalarValue::to_array_of_size #18903

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Allocate a buffer of the correct length for ScalarValue::FixedSizeBinary in ScalarValue::to_array_of_size #18903

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9ae29cb
Allocate a buffer of the correct length for ScalarValue::FixedSizeBin…
tobixdev Nov 24, 2025
b79d122
Use FixedSizeBinaryBuilder instead of directly constructing the Fixed…
tobixdev Nov 26, 2025
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39 changes: 29 additions & 10 deletions datafusion/common/src/scalar/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -61,15 +61,15 @@ use arrow::array::{
Date64Array, Decimal128Array, Decimal256Array, Decimal32Array, Decimal64Array,
DictionaryArray, DurationMicrosecondArray, DurationMillisecondArray,
DurationNanosecondArray, DurationSecondArray, FixedSizeBinaryArray,
FixedSizeListArray, Float16Array, Float32Array, Float64Array, GenericListArray,
Int16Array, Int32Array, Int64Array, Int8Array, IntervalDayTimeArray,
IntervalMonthDayNanoArray, IntervalYearMonthArray, LargeBinaryArray, LargeListArray,
LargeStringArray, ListArray, MapArray, MutableArrayData, OffsetSizeTrait,
PrimitiveArray, Scalar, StringArray, StringViewArray, StructArray,
Time32MillisecondArray, Time32SecondArray, Time64MicrosecondArray,
Time64NanosecondArray, TimestampMicrosecondArray, TimestampMillisecondArray,
TimestampNanosecondArray, TimestampSecondArray, UInt16Array, UInt32Array,
UInt64Array, UInt8Array, UnionArray,
FixedSizeBinaryBuilder, FixedSizeListArray, Float16Array, Float32Array, Float64Array,
GenericListArray, Int16Array, Int32Array, Int64Array, Int8Array,
IntervalDayTimeArray, IntervalMonthDayNanoArray, IntervalYearMonthArray,
LargeBinaryArray, LargeListArray, LargeStringArray, ListArray, MapArray,
MutableArrayData, OffsetSizeTrait, PrimitiveArray, Scalar, StringArray,
StringViewArray, StructArray, Time32MillisecondArray, Time32SecondArray,
Time64MicrosecondArray, Time64NanosecondArray, TimestampMicrosecondArray,
TimestampMillisecondArray, TimestampNanosecondArray, TimestampSecondArray,
UInt16Array, UInt32Array, UInt64Array, UInt8Array, UnionArray,
};
use arrow::buffer::{BooleanBuffer, ScalarBuffer};
use arrow::compute::kernels::cast::{cast_with_options, CastOptions};
Expand Down Expand Up @@ -3055,7 +3055,14 @@ impl ScalarValue {
)
.unwrap(),
),
None => Arc::new(FixedSizeBinaryArray::new_null(*s, size)),
None => {
// TODO: Replace with FixedSizeBinaryArray::new_null once a fix for
// https://github.com/apache/arrow-rs/issues/8900 is in the used arrow-rs
// version.
let mut builder = FixedSizeBinaryBuilder::new(*s);
builder.append_nulls(size);
Arc::new(builder.finish())
}
},
ScalarValue::LargeBinary(e) => match e {
Some(value) => Arc::new(
Expand Down Expand Up @@ -5314,6 +5321,18 @@ mod tests {
assert_eq!(empty_array.len(), 0);
}

/// See https://github.com/apache/datafusion/issues/18870
#[test]
fn test_to_array_of_size_for_none_fsb() {
let sv = ScalarValue::FixedSizeBinary(5, None);
let result = sv
.to_array_of_size(2)
.expect("Failed to convert to array of size");
assert_eq!(result.len(), 2);
assert_eq!(result.null_count(), 2);
assert_eq!(result.as_fixed_size_binary().values().len(), 10);
}

#[test]
fn test_list_to_array_string() {
let scalars = vec![
Expand Down