VarBin to arrow conversion uses reinterpret cast to convert offsets t…

…o I32/64 (#1644)

In cases where the cast would have failed we will end up with an invalid
array and fail at some point down the line. It's unclear if we should
even allow U32 offsets that are longer than I32 since that's not arrow
compatible.

vortex-array/src/array/varbin/arrow.rs

@@ -19,8 +19,8 @@ pub(crate) fn varbin_to_arrow(varbin_array: &VarBinArray) -> VortexResult<ArrayR
         .map_err(|err| err.with_context("Failed to canonicalize offsets"))?;
     let offsets = match offsets.ptype() {
         PType::I32 | PType::I64 => offsets,
-        PType::U64 => try_cast(offsets, PType::I64.into())?.into_primitive()?,
-        PType::U32 => try_cast(offsets, PType::I32.into())?.into_primitive()?,
+        PType::U64 => offsets.reinterpret_cast(PType::I64),
+        PType::U32 => offsets.reinterpret_cast(PType::I32),
 
         // Unless it's u64, everything else can be converted into an i32.
         _ => try_cast(offsets.to_array(), PType::I32.into())