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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="doccomment">//! Binary that concatenates the column data of one or more parquet files |
| //! |
| //! # Install |
| //! |
| //! `parquet-concat` can be installed using `cargo`: |
| //! ``` |
| //! cargo install parquet --features=cli |
| //! ``` |
| //! After this `parquet-concat` should be available: |
| //! ``` |
| //! parquet-concat out.parquet a.parquet b.parquet |
| //! ``` |
| //! |
| //! The binary can also be built from the source code and run as follows: |
| //! ``` |
| //! cargo run --features=cli --bin parquet-concat out.parquet a.parquet b.parquet |
| //! ``` |
| //! |
| //! Note: this does not currently support preserving the page index or bloom filters |
| //! |
| |
| </span><span class="kw">use </span>clap::Parser; |
| <span class="kw">use </span>parquet::column::writer::ColumnCloseResult; |
| <span class="kw">use </span>parquet::errors::{ParquetError, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>parquet::file::properties::WriterProperties; |
| <span class="kw">use </span>parquet::file::writer::SerializedFileWriter; |
| <span class="kw">use </span>std::fs::File; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="attr">#[derive(Debug, Parser)] |
| #[clap(author, version)] |
| </span><span class="doccomment">/// Concatenates one or more parquet files |
| </span><span class="kw">struct </span>Args { |
| <span class="doccomment">/// Path to output |
| </span>output: String, |
| |
| <span class="doccomment">/// Path to input files |
| </span>input: Vec<String>, |
| } |
| |
| <span class="kw">impl </span>Args { |
| <span class="kw">fn </span>run(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span><span class="self">self</span>.input.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(ParquetError::General( |
| <span class="string">"Must provide at least one input file"</span>.into(), |
| )); |
| } |
| |
| <span class="kw">let </span>output = File::create(<span class="kw-2">&</span><span class="self">self</span>.output)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>inputs = <span class="self">self |
| </span>.input |
| .iter() |
| .map(|x| { |
| <span class="kw">let </span>reader = File::open(x)<span class="question-mark">?</span>; |
| <span class="kw">let </span>metadata = parquet::file::footer::parse_metadata(<span class="kw-2">&</span>reader)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((reader, metadata)) |
| }) |
| .collect::<<span class="prelude-ty">Result</span><Vec<<span class="kw">_</span>>>>()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>expected = inputs[<span class="number">0</span>].<span class="number">1</span>.file_metadata().schema(); |
| <span class="kw">for </span>(<span class="kw">_</span>, metadata) <span class="kw">in </span>inputs.iter().skip(<span class="number">1</span>) { |
| <span class="kw">let </span>actual = metadata.file_metadata().schema(); |
| <span class="kw">if </span>expected != actual { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(ParquetError::General(<span class="macro">format!</span>( |
| <span class="string">"inputs must have the same schema, {expected:#?} vs {actual:#?}" |
| </span>))); |
| } |
| } |
| |
| <span class="kw">let </span>props = Arc::new(WriterProperties::builder().build()); |
| <span class="kw">let </span>schema = inputs[<span class="number">0</span>].<span class="number">1</span>.file_metadata().schema_descr().root_schema_ptr(); |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = SerializedFileWriter::new(output, schema, props)<span class="question-mark">?</span>; |
| |
| <span class="kw">for </span>(input, metadata) <span class="kw">in </span>inputs { |
| <span class="kw">for </span>rg <span class="kw">in </span>metadata.row_groups() { |
| <span class="kw">let </span><span class="kw-2">mut </span>rg_out = writer.next_row_group()<span class="question-mark">?</span>; |
| <span class="kw">for </span>column <span class="kw">in </span>rg.columns() { |
| <span class="kw">let </span>result = ColumnCloseResult { |
| bytes_written: column.compressed_size() <span class="kw">as _</span>, |
| rows_written: rg.num_rows() <span class="kw">as _</span>, |
| metadata: column.clone(), |
| bloom_filter: <span class="prelude-val">None</span>, |
| column_index: <span class="prelude-val">None</span>, |
| offset_index: <span class="prelude-val">None</span>, |
| }; |
| rg_out.append_column(<span class="kw-2">&</span>input, result)<span class="question-mark">?</span>; |
| } |
| rg_out.close()<span class="question-mark">?</span>; |
| } |
| } |
| |
| writer.close()<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">fn </span>main() -> <span class="prelude-ty">Result</span><()> { |
| Args::parse().run() |
| } |
| </code></pre></div></section></main></body></html> |
