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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>std::{io::Read, sync::Arc}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::format::{ColumnOrder <span class="kw">as </span>TColumnOrder, FileMetaData <span class="kw">as </span>TFileMetaData}; |
| <span class="kw">use </span><span class="kw">crate</span>::thrift::{TCompactSliceInputProtocol, TSerializable}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::basic::ColumnOrder; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::errors::{ParquetError, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span><span class="kw">crate</span>::file::{metadata::<span class="kw-2">*</span>, reader::ChunkReader, FOOTER_SIZE, PARQUET_MAGIC}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::schema::types::{<span class="self">self</span>, SchemaDescriptor}; |
| |
| <span class="doccomment">/// Reads the [ParquetMetaData] from the footer of the parquet file. |
| /// |
| /// # Layout of Parquet file |
| /// ```text |
| /// +---------------------------+-----+---+ |
| /// | Rest of file | B | A | |
| /// +---------------------------+-----+---+ |
| /// ``` |
| /// where |
| /// * `A`: parquet footer which stores the length of the metadata. |
| /// * `B`: parquet metadata. |
| /// |
| /// # I/O |
| /// |
| /// This method first reads the last 8 bytes of the file via |
| /// [`ChunkReader::get_read`] to get the the parquet footer which contains the |
| /// metadata length. |
| /// |
| /// It then issues a second `get_read` to read the encoded metadata |
| /// metadata. |
| /// |
| /// # See Also |
| /// [`decode_metadata`] for decoding the metadata from the bytes. |
| /// [`decode_footer`] for decoding the metadata length from the footer. |
| </span><span class="kw">pub fn </span>parse_metadata<R: ChunkReader>(chunk_reader: <span class="kw-2">&</span>R) -> <span class="prelude-ty">Result</span><ParquetMetaData> { |
| <span class="comment">// check file is large enough to hold footer |
| </span><span class="kw">let </span>file_size = chunk_reader.len(); |
| <span class="kw">if </span>file_size < (FOOTER_SIZE <span class="kw">as </span>u64) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">general_err!</span>( |
| <span class="string">"Invalid Parquet file. Size is smaller than footer" |
| </span>)); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>footer = [<span class="number">0_u8</span>; <span class="number">8</span>]; |
| chunk_reader |
| .get_read(file_size - <span class="number">8</span>)<span class="question-mark">? |
| </span>.read_exact(<span class="kw-2">&mut </span>footer)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>metadata_len = decode_footer(<span class="kw-2">&</span>footer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>footer_metadata_len = FOOTER_SIZE + metadata_len; |
| |
| <span class="kw">if </span>footer_metadata_len > file_size <span class="kw">as </span>usize { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">general_err!</span>( |
| <span class="string">"Invalid Parquet file. Reported metadata length of {} + {} byte footer, but file is only {} bytes"</span>, |
| metadata_len, |
| FOOTER_SIZE, |
| file_size |
| )); |
| } |
| |
| <span class="kw">let </span>start = file_size - footer_metadata_len <span class="kw">as </span>u64; |
| decode_metadata(chunk_reader.get_bytes(start, metadata_len)<span class="question-mark">?</span>.as_ref()) |
| } |
| |
| <span class="doccomment">/// Decodes [`ParquetMetaData`] from the provided bytes. |
| /// |
| /// Typically this is used to decode the metadata from the end of a parquet |
| /// file. The format of `buf` is the Thift compact binary protocol, as specified |
| /// by the [Parquet Spec]. |
| /// |
| /// [Parquet Spec]: https://github.com/apache/parquet-format#metadata |
| </span><span class="kw">pub fn </span>decode_metadata(buf: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><ParquetMetaData> { |
| <span class="comment">// TODO: row group filtering |
| </span><span class="kw">let </span><span class="kw-2">mut </span>prot = TCompactSliceInputProtocol::new(buf); |
| <span class="kw">let </span>t_file_metadata: TFileMetaData = TFileMetaData::read_from_in_protocol(<span class="kw-2">&mut </span>prot) |
| .map_err(|e| ParquetError::General(<span class="macro">format!</span>(<span class="string">"Could not parse metadata: {e}"</span>)))<span class="question-mark">?</span>; |
| <span class="kw">let </span>schema = types::from_thrift(<span class="kw-2">&</span>t_file_metadata.schema)<span class="question-mark">?</span>; |
| <span class="kw">let </span>schema_descr = Arc::new(SchemaDescriptor::new(schema)); |
| <span class="kw">let </span><span class="kw-2">mut </span>row_groups = Vec::new(); |
| <span class="kw">for </span>rg <span class="kw">in </span>t_file_metadata.row_groups { |
| row_groups.push(RowGroupMetaData::from_thrift(schema_descr.clone(), rg)<span class="question-mark">?</span>); |
| } |
| <span class="kw">let </span>column_orders = parse_column_orders(t_file_metadata.column_orders, <span class="kw-2">&</span>schema_descr); |
| |
| <span class="kw">let </span>file_metadata = FileMetaData::new( |
| t_file_metadata.version, |
| t_file_metadata.num_rows, |
| t_file_metadata.created_by, |
| t_file_metadata.key_value_metadata, |
| schema_descr, |
| column_orders, |
| ); |
| <span class="prelude-val">Ok</span>(ParquetMetaData::new(file_metadata, row_groups)) |
| } |
| |
| <span class="doccomment">/// Decodes the Parquet footer returning the metadata length in bytes |
| /// |
| /// A parquet footer is 8 bytes long and has the following layout: |
| /// * 4 bytes for the metadata length |
| /// * 4 bytes for the magic bytes 'PAR1' |
| /// |
| /// ```text |
| /// +-----+--------+ |
| /// | len | 'PAR1' | |
| /// +-----+--------+ |
| /// ``` |
| </span><span class="kw">pub fn </span>decode_footer(slice: <span class="kw-2">&</span>[u8; FOOTER_SIZE]) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="comment">// check this is indeed a parquet file |
| </span><span class="kw">if </span>slice[<span class="number">4</span>..] != PARQUET_MAGIC { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">general_err!</span>(<span class="string">"Invalid Parquet file. Corrupt footer"</span>)); |
| } |
| |
| <span class="comment">// get the metadata length from the footer |
| </span><span class="kw">let </span>metadata_len = u32::from_le_bytes(slice[..<span class="number">4</span>].try_into().unwrap()); |
| <span class="comment">// u32 won't be larger than usize in most cases |
| </span><span class="prelude-val">Ok</span>(metadata_len <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Parses column orders from Thrift definition. |
| /// If no column orders are defined, returns `None`. |
| </span><span class="kw">fn </span>parse_column_orders( |
| t_column_orders: <span class="prelude-ty">Option</span><Vec<TColumnOrder>>, |
| schema_descr: <span class="kw-2">&</span>SchemaDescriptor, |
| ) -> <span class="prelude-ty">Option</span><Vec<ColumnOrder>> { |
| <span class="kw">match </span>t_column_orders { |
| <span class="prelude-val">Some</span>(orders) => { |
| <span class="comment">// Should always be the case |
| </span><span class="macro">assert_eq!</span>( |
| orders.len(), |
| schema_descr.num_columns(), |
| <span class="string">"Column order length mismatch" |
| </span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Vec::new(); |
| <span class="kw">for </span>(i, column) <span class="kw">in </span>schema_descr.columns().iter().enumerate() { |
| <span class="kw">match </span>orders[i] { |
| TColumnOrder::TYPEORDER(<span class="kw">_</span>) => { |
| <span class="kw">let </span>sort_order = ColumnOrder::get_sort_order( |
| column.logical_type(), |
| column.converted_type(), |
| column.physical_type(), |
| ); |
| res.push(ColumnOrder::TYPE_DEFINED_ORDER(sort_order)); |
| } |
| } |
| } |
| <span class="prelude-val">Some</span>(res) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>bytes::Bytes; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::basic::SortOrder; |
| <span class="kw">use </span><span class="kw">crate</span>::basic::Type; |
| <span class="kw">use </span><span class="kw">crate</span>::format::TypeDefinedOrder; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::types::Type <span class="kw">as </span>SchemaType; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>test_parse_metadata_size_smaller_than_footer() { |
| <span class="kw">let </span>test_file = tempfile::tempfile().unwrap(); |
| <span class="kw">let </span>reader_result = parse_metadata(<span class="kw-2">&</span>test_file); |
| <span class="macro">assert_eq!</span>( |
| reader_result.unwrap_err().to_string(), |
| <span class="string">"Parquet error: Invalid Parquet file. Size is smaller than footer" |
| </span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>test_parse_metadata_corrupt_footer() { |
| <span class="kw">let </span>data = Bytes::from(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>]); |
| <span class="kw">let </span>reader_result = parse_metadata(<span class="kw-2">&</span>data); |
| <span class="macro">assert_eq!</span>( |
| reader_result.unwrap_err().to_string(), |
| <span class="string">"Parquet error: Invalid Parquet file. Corrupt footer" |
| </span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>test_parse_metadata_invalid_start() { |
| <span class="kw">let </span>test_file = Bytes::from(<span class="macro">vec!</span>[<span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="string">b'P'</span>, <span class="string">b'A'</span>, <span class="string">b'R'</span>, <span class="string">b'1'</span>]); |
| <span class="kw">let </span>reader_result = parse_metadata(<span class="kw-2">&</span>test_file); |
| <span class="macro">assert_eq!</span>( |
| reader_result.unwrap_err().to_string(), |
| <span class="string">"Parquet error: Invalid Parquet file. Reported metadata length of 255 + 8 byte footer, but file is only 8 bytes" |
| </span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>test_metadata_column_orders_parse() { |
| <span class="comment">// Define simple schema, we do not need to provide logical types. |
| </span><span class="kw">let </span>fields = <span class="macro">vec!</span>[ |
| Arc::new( |
| SchemaType::primitive_type_builder(<span class="string">"col1"</span>, Type::INT32) |
| .build() |
| .unwrap(), |
| ), |
| Arc::new( |
| SchemaType::primitive_type_builder(<span class="string">"col2"</span>, Type::FLOAT) |
| .build() |
| .unwrap(), |
| ), |
| ]; |
| <span class="kw">let </span>schema = SchemaType::group_type_builder(<span class="string">"schema"</span>) |
| .with_fields(fields) |
| .build() |
| .unwrap(); |
| <span class="kw">let </span>schema_descr = SchemaDescriptor::new(Arc::new(schema)); |
| |
| <span class="kw">let </span>t_column_orders = <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[ |
| TColumnOrder::TYPEORDER(TypeDefinedOrder::new()), |
| TColumnOrder::TYPEORDER(TypeDefinedOrder::new()), |
| ]); |
| |
| <span class="macro">assert_eq!</span>( |
| parse_column_orders(t_column_orders, <span class="kw-2">&</span>schema_descr), |
| <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[ |
| ColumnOrder::TYPE_DEFINED_ORDER(SortOrder::SIGNED), |
| ColumnOrder::TYPE_DEFINED_ORDER(SortOrder::SIGNED) |
| ]) |
| ); |
| |
| <span class="comment">// Test when no column orders are defined. |
| </span><span class="macro">assert_eq!</span>(parse_column_orders(<span class="prelude-val">None</span>, <span class="kw-2">&</span>schema_descr), <span class="prelude-val">None</span>); |
| } |
| |
| <span class="attr">#[test] |
| #[should_panic(expected = <span class="string">"Column order length mismatch"</span>)] |
| </span><span class="kw">fn </span>test_metadata_column_orders_len_mismatch() { |
| <span class="kw">let </span>schema = SchemaType::group_type_builder(<span class="string">"schema"</span>).build().unwrap(); |
| <span class="kw">let </span>schema_descr = SchemaDescriptor::new(Arc::new(schema)); |
| |
| <span class="kw">let </span>t_column_orders = <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[TColumnOrder::TYPEORDER(TypeDefinedOrder::new())]); |
| |
| parse_column_orders(t_column_orders, <span class="kw-2">&</span>schema_descr); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
