Allow float fill values to be created from int fill value metadata.

The cast is lossy.

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+ - Allow float fill values to be created from int fill value metadata
+
 ### Fixed
  - Fix `compute_encoded_size()` for `BitroundCodec` incorrectly indicating various data types were unsupported
 

src/array/fill_value_metadata.rs

@@ -199,6 +199,8 @@ impl FillValueMetadata {
     #[must_use]
     pub fn try_as_float<T: FloatCore>(&self) -> Option<T> {
         match self {
+            Self::Int(int) => num::traits::cast(*int),
+            Self::UInt(uint) => num::traits::cast(*uint),
             Self::Float(float) => {
                 use FillValueFloat as F;
                 match float {
@@ -259,6 +261,16 @@ impl FillValueMetadata {
     #[must_use]
     pub fn try_as_float16(&self) -> Option<f16> {
         match self {
+            Self::Int(int) =>
+            {
+                #[allow(clippy::cast_precision_loss)]
+                Some(f16::from_f64(*int as f64))
+            }
+            Self::UInt(uint) =>
+            {
+                #[allow(clippy::cast_precision_loss)]
+                Some(f16::from_f64(*uint as f64))
+            }
             Self::Float(float) => {
                 use FillValueFloat as F;
                 match float {
@@ -287,6 +299,16 @@ impl FillValueMetadata {
     #[must_use]
     pub fn try_as_bfloat16(&self) -> Option<bf16> {
         match self {
+            Self::Int(int) =>
+            {
+                #[allow(clippy::cast_precision_loss)]
+                Some(bf16::from_f64(*int as f64))
+            }
+            Self::UInt(uint) =>
+            {
+                #[allow(clippy::cast_precision_loss)]
+                Some(bf16::from_f64(*uint as f64))
+            }
             Self::Float(float) => {
                 use FillValueFloat as F;
                 match float {