scovich commented on code in PR #8521:
URL: https://github.com/apache/arrow-rs/pull/8521#discussion_r2396039716
##########
parquet-variant-compute/src/arrow_to_variant.rs:
##########
@@ -38,6 +38,98 @@ use parquet_variant::{
use std::collections::HashMap;
use std::ops::Range;
+// ============================================================================
+// Shared traits and helpers for Arrow-to-Variant conversion
+// ============================================================================
+
+/// Zero-cost trait for converting Arrow array values to Variant
+pub(crate) trait ArrowToVariant: Array {
+ fn append_to_variant_builder(
+ &self,
+ builder: &mut impl VariantBuilderExt,
+ index: usize,
+ ) -> Result<(), ArrowError>;
+}
+
+/// Macro to define ArrowToVariant implementations with optional value
transformation
+macro_rules! define_arrow_to_variant {
Review Comment:
Oh, and casting failures also... converting arrow value to variant can fail,
and cast options decides whether the failure produces `Variant::Null` or an
error. In _theory_, unshredding is infallible and any failure there is due to
invalid data (so should always produce an error).
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