lance 0.7.3

A columnar data format that is 100x faster than Parquet for random access.
Documentation 
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// 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.

//! Metadata for index

use uuid::Uuid;

use super::*;
use crate::Error;

/// Index metadata
#[derive(Debug, Clone)]
pub struct Index {
    /// Unique ID across all dataset versions.
    pub uuid: Uuid,

    /// Fields to build the index.
    pub fields: Vec<i32>,

    /// Human readable index name
    pub name: String,

    /// The latest version of the dataset this index covers
    pub dataset_version: u64,
}

impl Index {
    pub fn new(uuid: Uuid, name: &str, fields: &[i32], dataset_version: u64) -> Self {
        Self {
            uuid,
            name: name.to_string(),
            fields: Vec::from(fields),
            dataset_version,
        }
    }
}

impl TryFrom<&pb::IndexMetadata> for Index {
    type Error = Error;

    fn try_from(proto: &pb::IndexMetadata) -> Result<Self> {
        Ok(Self {
            uuid: proto
                .uuid
                .as_ref()
                .map(Uuid::try_from)
                .ok_or_else(|| Error::IO {
                    message: "uuid field does not exist in Index metadata".to_string(),
                })??,
            name: proto.name.clone(),
            fields: proto.fields.clone(),
            dataset_version: proto.dataset_version,
        })
    }
}

impl From<&Index> for pb::IndexMetadata {
    fn from(idx: &Index) -> Self {
        Self {
            uuid: Some((&idx.uuid).into()),
            name: idx.name.clone(),
            fields: idx.fields.clone(),
            dataset_version: idx.dataset_version,
        }
    }
}

impl From<&Vec<Index>> for pb::IndexSection {
    fn from(indices: &Vec<Index>) -> Self {
        Self {
            indices: indices.iter().map(pb::IndexMetadata::from).collect(),
        }
    }
}