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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.
//! Per-page encoding information.
use crate::basic::{Encoding, PageType};
use crate::errors::Result;
use crate::format::{
Encoding as TEncoding, PageEncodingStats as TPageEncodingStats, PageType as TPageType,
};
/// PageEncodingStats for a column chunk and data page.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PageEncodingStats {
/// the page type (data/dic/...)
pub page_type: PageType,
/// encoding of the page
pub encoding: Encoding,
/// number of pages of this type with this encoding
pub count: i32,
}
/// Converts Thrift definition into `PageEncodingStats`.
pub fn try_from_thrift(thrift_encoding_stats: &TPageEncodingStats) -> Result<PageEncodingStats> {
let page_type = PageType::try_from(thrift_encoding_stats.page_type)?;
let encoding = Encoding::try_from(thrift_encoding_stats.encoding)?;
let count = thrift_encoding_stats.count;
Ok(PageEncodingStats {
page_type,
encoding,
count,
})
}
/// Converts `PageEncodingStats` into Thrift definition.
pub fn to_thrift(encoding_stats: &PageEncodingStats) -> TPageEncodingStats {
let page_type = TPageType::from(encoding_stats.page_type);
let encoding = TEncoding::from(encoding_stats.encoding);
let count = encoding_stats.count;
TPageEncodingStats {
page_type,
encoding,
count,
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_page_encoding_stats_from_thrift() {
let stats = PageEncodingStats {
page_type: PageType::DATA_PAGE,
encoding: Encoding::PLAIN,
count: 1,
};
assert_eq!(try_from_thrift(&to_thrift(&stats)).unwrap(), stats);
}
}