impl From<ScalarBuffer<T>> for Buffer (#6389)

Author: mbrobbel

arrow-buffer/src/buffer/immutable.rs

@@ -26,7 +26,7 @@ use crate::BufferBuilder;
 use crate::{bytes::Bytes, native::ArrowNativeType};
 
 use super::ops::bitwise_unary_op_helper;
-use super::MutableBuffer;
+use super::{MutableBuffer, ScalarBuffer};
 
 /// Buffer represents a contiguous memory region that can be shared with other buffers and across
 /// thread boundaries.
@@ -391,6 +391,12 @@ impl<T: ArrowNativeType> From<Vec<T>> for Buffer {
     }
 }
 
+impl<T: ArrowNativeType> From<ScalarBuffer<T>> for Buffer {
+    fn from(value: ScalarBuffer<T>) -> Self {
+        value.into_inner()
+    }
+}
+
 /// Creating a `Buffer` instance by storing the boolean values into the buffer
 impl FromIterator<bool> for Buffer {
     fn from_iter<I>(iter: I) -> Self