alamb commented on code in PR #7404: URL: https://github.com/apache/arrow-rs/pull/7404#discussion_r2049641522
########## arrow-array/src/array/variant_array.rs: ########## @@ -0,0 +1,628 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use crate::array::print_long_array; +use crate::builder::{ArrayBuilder, BinaryBuilder}; +use crate::{Array, ArrayRef}; +use arrow_buffer::{Buffer, NullBuffer, OffsetBuffer, ScalarBuffer}; +use arrow_data::{ArrayData, ArrayDataBuilder}; +use arrow_schema::{ArrowError, DataType, Field}; + +#[cfg(feature = "canonical_extension_types")] +use arrow_schema::extension::Variant; +use std::sync::Arc; +use std::any::Any; + +/// An array of Variant values. +/// +/// The Variant extension type stores data as two binary values: metadata and value. +/// This array stores each Variant as a concatenated binary value (metadata + value). +/// +/// # Example +/// +/// ``` +/// use arrow_array::VariantArray; +/// use arrow_schema::extension::Variant; +/// use arrow_array::Array; // Import the Array trait +/// +/// // Create metadata and value for each variant +/// let metadata = vec![ +/// 0x01, // header: version=1, sorted=0, offset_size=1 +/// 0x01, // dictionary_size = 1 +/// 0x00, // offset 0 +/// 0x03, // offset 3 +/// b'k', b'e', b'y' // dictionary bytes +/// ]; +/// let variant_type = Variant::new(metadata.clone(), vec![]); +/// +/// // Create variants with different values +/// let variants = vec![ +/// Variant::new(metadata.clone(), b"null".to_vec()), +/// Variant::new(metadata.clone(), b"true".to_vec()), +/// Variant::new(metadata.clone(), b"{\"a\": 1}".to_vec()), +/// ]; +/// +/// // Create a VariantArray +/// let variant_array = VariantArray::from_variants(variant_type, variants.clone()).expect("Failed to create VariantArray"); +/// +/// // Access variants from the array +/// assert_eq!(variant_array.len(), 3); +/// let retrieved = variant_array.value(0).expect("Failed to get value"); +/// assert_eq!(retrieved.metadata(), &metadata); +/// assert_eq!(retrieved.value(), b"null"); +/// ``` +#[cfg(feature = "canonical_extension_types")] +pub mod variant_array_module { + use super::*; + + /// An array of Variant values. + /// + /// The Variant extension type stores data as two binary values: metadata and value. + /// This array stores each Variant as a concatenated binary value (metadata + value). + /// + /// # Example + /// + /// ``` + /// use arrow_array::VariantArray; + /// use arrow_schema::extension::Variant; + /// use arrow_array::Array; // Import the Array trait + /// + /// // Create metadata and value for each variant + /// let metadata = vec![ + /// 0x01, // header: version=1, sorted=0, offset_size=1 + /// 0x01, // dictionary_size = 1 + /// 0x00, // offset 0 + /// 0x03, // offset 3 + /// b'k', b'e', b'y' // dictionary bytes + /// ]; + /// let variant_type = Variant::new(metadata.clone(), vec![]); + /// + /// // Create variants with different values + /// let variants = vec![ + /// Variant::new(metadata.clone(), b"null".to_vec()), + /// Variant::new(metadata.clone(), b"true".to_vec()), + /// Variant::new(metadata.clone(), b"{\"a\": 1}".to_vec()), + /// ]; + /// + /// // Create a VariantArray + /// let variant_array = VariantArray::from_variants(variant_type, variants.clone()).expect("Failed to create VariantArray"); + /// + /// // Access variants from the array + /// assert_eq!(variant_array.len(), 3); + /// let retrieved = variant_array.value(0).expect("Failed to get value"); + /// assert_eq!(retrieved.metadata(), &metadata); + /// assert_eq!(retrieved.value(), b"null"); + /// ``` + #[derive(Clone, Debug)] + pub struct VariantArray { Review Comment: > I looked into updating to the latest revision from parquet-format, but it introduces new types like GEOMETRY, GEOGRAPHY, and other changes that are not yet supported in the arrow-rs main branch. I think it is fine to add the type definitions for those new types. @etseidl actually has a PR where he updated the thrift definition here: https://github.com/apache/arrow-rs/pull/7408/files#diff-d4b6c8a220629cfe5ac02a85cd537547b2e5c77b01e0793ced98adeb809bcde4R20 Though it is not clear what the status of that PR is. I will try and find time to write up some tickets with some smaller sub tasks tomorrow -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
