alamb commented on code in PR #8201:
URL: https://github.com/apache/arrow-rs/pull/8201#discussion_r2291824993
##########
parquet-variant-compute/src/cast_to_variant.rs:
##########
@@ -535,6 +534,70 @@ pub fn cast_to_variant(input: &dyn Array) ->
Result<VariantArray, ArrowError> {
builder.append_variant(value);
}
}
+ DataType::List(_) => {
+ let list_array = input.as_list::<i32>();
+ let values_variant_array =
cast_to_variant(list_array.values().as_ref())?;
Review Comment:
as a future optimization, we could avoid casting the entire values to
variant if the list only refers to a subset
For example, if the list array is sliced, then `start` will not be zero, so
we could avoid casting the all the elements of the list
The same comment applies below
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