tustvold commented on code in PR #5081:
URL: https://github.com/apache/arrow-rs/pull/5081#discussion_r1396827482
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arrow-cast/src/cast.rs:
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@@ -279,6 +282,10 @@ pub fn can_cast_types(from_type: &DataType, to_type:
&DataType) -> bool {
/// in integer casts return null
/// * Numeric to boolean: 0 returns `false`, any other value returns `true`
/// * List to List: the underlying data type is cast
+/// * List to FixedSizeList: the underlying data type is cast. If the list
size is different
+/// than the FixedSizeList size and safe casting is requested, then lists are
+/// truncated or filled will some value to achieve the requested size. If
the output
+/// field is nullable, the fill value is null, otherwise it is the first
value.
Review Comment:
We allow nulls in non-nullable children provided they are masked by the
parents null mask.
I'm not sure about truncating, I'll think on it
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