| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `parquet/src/util/test_common/page_util.rs`."><title>page_util.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="parquet" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0-nightly (b92758a9a 2024-05-20)" data-channel="nightly" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../../../../static.files/src-script-e66d777a5a92e9b2.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a> |
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| </pre></div><pre class="rust"><code><span class="comment">// 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. |
| |
| </span><span class="kw">use </span>bytes::Bytes; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::basic::Encoding; |
| <span class="kw">use </span><span class="kw">crate</span>::column::page::{Page, PageIterator}; |
| <span class="kw">use </span><span class="kw">crate</span>::column::page::{PageMetadata, PageReader}; |
| <span class="kw">use </span><span class="kw">crate</span>::data_type::DataType; |
| <span class="kw">use </span><span class="kw">crate</span>::encodings::encoding::{get_encoder, Encoder}; |
| <span class="kw">use </span><span class="kw">crate</span>::encodings::levels::LevelEncoder; |
| <span class="kw">use </span><span class="kw">crate</span>::errors::Result; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::types::ColumnDescPtr; |
| <span class="kw">use </span>std::iter::Peekable; |
| <span class="kw">use </span>std::mem; |
| |
| <span class="kw">pub trait </span>DataPageBuilder { |
| <span class="kw">fn </span>add_rep_levels(<span class="kw-2">&mut </span><span class="self">self</span>, max_level: i16, rep_levels: <span class="kw-2">&</span>[i16]); |
| <span class="kw">fn </span>add_def_levels(<span class="kw-2">&mut </span><span class="self">self</span>, max_level: i16, def_levels: <span class="kw-2">&</span>[i16]); |
| <span class="kw">fn </span>add_values<T: DataType>(<span class="kw-2">&mut </span><span class="self">self</span>, encoding: Encoding, values: <span class="kw-2">&</span>[T::T]); |
| <span class="kw">fn </span>add_indices(<span class="kw-2">&mut </span><span class="self">self</span>, indices: Bytes); |
| <span class="kw">fn </span>consume(<span class="self">self</span>) -> Page; |
| } |
| |
| <span class="doccomment">/// A utility struct for building data pages (v1 or v2). Callers must call: |
| /// - add_rep_levels() |
| /// - add_def_levels() |
| /// - add_values() for normal data page / add_indices() for dictionary data page |
| /// - consume() |
| /// in order to populate and obtain a data page. |
| </span><span class="kw">pub struct </span>DataPageBuilderImpl { |
| encoding: <span class="prelude-ty">Option</span><Encoding>, |
| num_values: u32, |
| buffer: Vec<u8>, |
| rep_levels_byte_len: u32, |
| def_levels_byte_len: u32, |
| datapage_v2: bool, |
| } |
| |
| <span class="kw">impl </span>DataPageBuilderImpl { |
| <span class="comment">// `num_values` is the number of non-null values to put in the data page. |
| // `datapage_v2` flag is used to indicate if the generated data page should use V2 |
| // format or not. |
| </span><span class="kw">pub fn </span>new(_desc: ColumnDescPtr, num_values: u32, datapage_v2: bool) -> <span class="self">Self </span>{ |
| DataPageBuilderImpl { |
| encoding: <span class="prelude-val">None</span>, |
| num_values, |
| buffer: <span class="macro">vec!</span>[], |
| rep_levels_byte_len: <span class="number">0</span>, |
| def_levels_byte_len: <span class="number">0</span>, |
| datapage_v2, |
| } |
| } |
| |
| <span class="comment">// Adds levels to the buffer and return number of encoded bytes |
| </span><span class="kw">fn </span>add_levels(<span class="kw-2">&mut </span><span class="self">self</span>, max_level: i16, levels: <span class="kw-2">&</span>[i16]) -> u32 { |
| <span class="kw">if </span>max_level <= <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="number">0</span>; |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>level_encoder = LevelEncoder::v1(Encoding::RLE, max_level, levels.len()); |
| level_encoder.put(levels); |
| <span class="kw">let </span>encoded_levels = level_encoder.consume(); |
| <span class="comment">// Actual encoded bytes (without length offset) |
| </span><span class="kw">let </span>encoded_bytes = <span class="kw-2">&</span>encoded_levels[mem::size_of::<i32>()..]; |
| <span class="kw">if </span><span class="self">self</span>.datapage_v2 { |
| <span class="comment">// Level encoder always initializes with offset of i32, where it stores |
| // length of encoded data; for data page v2 we explicitly |
| // store length, therefore we should skip i32 bytes. |
| </span><span class="self">self</span>.buffer.extend_from_slice(encoded_bytes); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.buffer.extend_from_slice(encoded_levels.as_slice()); |
| } |
| encoded_bytes.len() <span class="kw">as </span>u32 |
| } |
| } |
| |
| <span class="kw">impl </span>DataPageBuilder <span class="kw">for </span>DataPageBuilderImpl { |
| <span class="kw">fn </span>add_rep_levels(<span class="kw-2">&mut </span><span class="self">self</span>, max_levels: i16, rep_levels: <span class="kw-2">&</span>[i16]) { |
| <span class="self">self</span>.num_values = rep_levels.len() <span class="kw">as </span>u32; |
| <span class="self">self</span>.rep_levels_byte_len = <span class="self">self</span>.add_levels(max_levels, rep_levels); |
| } |
| |
| <span class="kw">fn </span>add_def_levels(<span class="kw-2">&mut </span><span class="self">self</span>, max_levels: i16, def_levels: <span class="kw-2">&</span>[i16]) { |
| <span class="self">self</span>.num_values = def_levels.len() <span class="kw">as </span>u32; |
| <span class="self">self</span>.def_levels_byte_len = <span class="self">self</span>.add_levels(max_levels, def_levels); |
| } |
| |
| <span class="kw">fn </span>add_values<T: DataType>(<span class="kw-2">&mut </span><span class="self">self</span>, encoding: Encoding, values: <span class="kw-2">&</span>[T::T]) { |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.num_values >= values.len() <span class="kw">as </span>u32, |
| <span class="string">"num_values: {}, values.len(): {}"</span>, |
| <span class="self">self</span>.num_values, |
| values.len() |
| ); |
| <span class="self">self</span>.encoding = <span class="prelude-val">Some</span>(encoding); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder: Box<<span class="kw">dyn </span>Encoder<T>> = |
| get_encoder::<T>(encoding).expect(<span class="string">"get_encoder() should be OK"</span>); |
| encoder.put(values).expect(<span class="string">"put() should be OK"</span>); |
| <span class="kw">let </span>encoded_values = encoder |
| .flush_buffer() |
| .expect(<span class="string">"consume_buffer() should be OK"</span>); |
| <span class="self">self</span>.buffer.extend_from_slice(<span class="kw-2">&</span>encoded_values); |
| } |
| |
| <span class="kw">fn </span>add_indices(<span class="kw-2">&mut </span><span class="self">self</span>, indices: Bytes) { |
| <span class="self">self</span>.encoding = <span class="prelude-val">Some</span>(Encoding::RLE_DICTIONARY); |
| <span class="self">self</span>.buffer.extend_from_slice(<span class="kw-2">&</span>indices); |
| } |
| |
| <span class="kw">fn </span>consume(<span class="self">self</span>) -> Page { |
| <span class="kw">if </span><span class="self">self</span>.datapage_v2 { |
| Page::DataPageV2 { |
| buf: Bytes::from(<span class="self">self</span>.buffer), |
| num_values: <span class="self">self</span>.num_values, |
| encoding: <span class="self">self</span>.encoding.unwrap(), |
| num_nulls: <span class="number">0</span>, <span class="comment">/* set to dummy value - don't need this when reading |
| * data page */ |
| </span>num_rows: <span class="self">self</span>.num_values, <span class="comment">/* num_rows only needs in skip_records, now we not support skip REPEATED field, |
| * so we can assume num_values == num_rows */ |
| </span>def_levels_byte_len: <span class="self">self</span>.def_levels_byte_len, |
| rep_levels_byte_len: <span class="self">self</span>.rep_levels_byte_len, |
| is_compressed: <span class="bool-val">false</span>, |
| statistics: <span class="prelude-val">None</span>, <span class="comment">// set to None, we do not need statistics for tests |
| </span>} |
| } <span class="kw">else </span>{ |
| Page::DataPage { |
| buf: Bytes::from(<span class="self">self</span>.buffer), |
| num_values: <span class="self">self</span>.num_values, |
| encoding: <span class="self">self</span>.encoding.unwrap(), |
| def_level_encoding: Encoding::RLE, |
| rep_level_encoding: Encoding::RLE, |
| statistics: <span class="prelude-val">None</span>, <span class="comment">// set to None, we do not need statistics for tests |
| </span>} |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A utility page reader which stores pages in memory. |
| </span><span class="kw">pub struct </span>InMemoryPageReader<P: Iterator<Item = Page>> { |
| page_iter: Peekable<P>, |
| } |
| |
| <span class="kw">impl</span><P: Iterator<Item = Page>> InMemoryPageReader<P> { |
| <span class="kw">pub fn </span>new(pages: <span class="kw">impl </span>IntoIterator<Item = Page, IntoIter = P>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| page_iter: pages.into_iter().peekable(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><P: Iterator<Item = Page> + Send> PageReader <span class="kw">for </span>InMemoryPageReader<P> { |
| <span class="kw">fn </span>get_next_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Page>> { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.page_iter.next()) |
| } |
| |
| <span class="kw">fn </span>peek_next_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><PageMetadata>> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(x) = <span class="self">self</span>.page_iter.peek() { |
| <span class="kw">match </span>x { |
| Page::DataPage { num_values, .. } => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(PageMetadata { |
| num_rows: <span class="prelude-val">None</span>, |
| num_levels: <span class="prelude-val">Some</span>(<span class="kw-2">*</span>num_values <span class="kw">as _</span>), |
| is_dict: <span class="bool-val">false</span>, |
| })), |
| Page::DataPageV2 { |
| num_rows, |
| num_values, |
| .. |
| } => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(PageMetadata { |
| num_rows: <span class="prelude-val">Some</span>(<span class="kw-2">*</span>num_rows <span class="kw">as _</span>), |
| num_levels: <span class="prelude-val">Some</span>(<span class="kw-2">*</span>num_values <span class="kw">as _</span>), |
| is_dict: <span class="bool-val">false</span>, |
| })), |
| Page::DictionaryPage { .. } => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(PageMetadata { |
| num_rows: <span class="prelude-val">None</span>, |
| num_levels: <span class="prelude-val">None</span>, |
| is_dict: <span class="bool-val">true</span>, |
| })), |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>skip_next_page(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.page_iter.next(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><P: Iterator<Item = Page> + Send> Iterator <span class="kw">for </span>InMemoryPageReader<P> { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Page>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.get_next_page().transpose() |
| } |
| } |
| |
| <span class="doccomment">/// A utility page iterator which stores page readers in memory, used for tests. |
| </span><span class="attr">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>InMemoryPageIterator<I: Iterator<Item = Vec<Page>>> { |
| page_reader_iter: I, |
| } |
| |
| <span class="kw">impl</span><I: Iterator<Item = Vec<Page>>> InMemoryPageIterator<I> { |
| <span class="kw">pub fn </span>new(pages: <span class="kw">impl </span>IntoIterator<Item = Vec<Page>, IntoIter = I>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| page_reader_iter: pages.into_iter(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><I: Iterator<Item = Vec<Page>>> Iterator <span class="kw">for </span>InMemoryPageIterator<I> { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>PageReader>>; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.page_reader_iter |
| .next() |
| .map(|x| <span class="prelude-val">Ok</span>(Box::new(InMemoryPageReader::new(x)) <span class="kw">as </span>Box<<span class="kw">dyn </span>PageReader>)) |
| } |
| } |
| |
| <span class="kw">impl</span><I: Iterator<Item = Vec<Page>> + Send> PageIterator <span class="kw">for </span>InMemoryPageIterator<I> {} |
| </code></pre></div></section></main></body></html> |
