liamzwbao commented on code in PR #8768:
URL: https://github.com/apache/arrow-rs/pull/8768#discussion_r2492349064
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parquet-variant-compute/src/variant_to_arrow.rs:
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@@ -60,6 +61,9 @@ pub(crate) enum PrimitiveVariantToArrowRowBuilder<'a> {
TimestampNanoNtz(VariantToTimestampNtzArrowRowBuilder<'a,
datatypes::TimestampNanosecondType>),
Time(VariantToPrimitiveArrowRowBuilder<'a,
datatypes::Time64MicrosecondType>),
Date(VariantToPrimitiveArrowRowBuilder<'a, datatypes::Date32Type>),
+ Utf8(VariantToUtf8ArrowRowBuilder<'a, i32>),
+ LargeUtf8(VariantToUtf8ArrowRowBuilder<'a, i64>),
+ Binary(VariantToBinaryArrowRowBuilder<'a>),
Review Comment:
Agreed on the first one as we may not need metadata column if explicitly
cast to Binary.
For the 2nd, I think the primitive is for arrow because we check
`is_primitive` and will throw error if the request data type is not primitive
[here](https://github.com/apache/arrow-rs/blob/6be6cbadf1f9bc0705b0aa97ca434ae3677ed43f/parquet-variant-compute/src/variant_to_arrow.rs#L325-L334).
Also based on the definition
[here](https://github.com/apache/arrow-rs/blob/6be6cbadf1f9bc0705b0aa97ca434ae3677ed43f/parquet-variant-compute/src/variant_to_arrow.rs#L36),
this builder is to convert variant values to primitive arrow
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