scovich commented on code in PR #8360:
URL: https://github.com/apache/arrow-rs/pull/8360#discussion_r2354144087
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parquet-variant-compute/src/variant_array_builder.rs:
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@@ -205,6 +208,155 @@ impl VariantBuilderExt for VariantArrayBuilder {
}
}
+/// A builder for creating only the value column of a [`VariantArray`]
+///
+/// This builder is used when you have existing metadata and only need to build
+/// the value column. It's useful for scenarios like variant unshredding, data
+/// transformation, or filtering where you want to reuse existing metadata.
+///
+/// The builder produces a [`BinaryViewArray`] that can be combined with
existing
+/// metadata to create a complete [`VariantArray`].
+///
+/// # Example:
+/// ```
+/// # use arrow::array::Array;
+/// # use parquet_variant::{Variant};
+/// # use parquet_variant_compute::VariantValueArrayBuilder;
+/// // Create a variant value builder for 10 rows
+/// let mut builder = VariantValueArrayBuilder::new(10);
+///
+/// // Append some values with their corresponding metadata
+/// // In practice, some of the variant values would be objects with internal
metadata.
Review Comment:
Sorry, I'm not sure I understand? Do you mean that I should call
`append_value` on the result of `VariantArray::value`?
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