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| <section id="reading-and-writing-parquet-files"> |
| <h1>Reading and writing Parquet files<a class="headerlink" href="#reading-and-writing-parquet-files" title="Permalink to this heading">¶</a></h1> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p><a class="reference internal" href="api/formats.html#cpp-api-parquet"><span class="std std-ref">Parquet reader and writer API reference</span></a>.</p> |
| </div> |
| <p>The <a class="reference external" href="https://parquet.apache.org/docs/">Parquet format</a> |
| is a space-efficient columnar storage format for complex data. The Parquet |
| C++ implementation is part of the Apache Arrow project and benefits |
| from tight integration with the Arrow C++ classes and facilities.</p> |
| <section id="reading-parquet-files"> |
| <h2>Reading Parquet files<a class="headerlink" href="#reading-parquet-files" title="Permalink to this heading">¶</a></h2> |
| <p>The <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileReaderE" title="parquet::arrow::FileReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::FileReader</span></code></a> class reads data into Arrow Tables and Record |
| Batches.</p> |
| <p>The <a class="reference internal" href="api/formats.html#_CPPv4N7parquet12StreamReaderE" title="parquet::StreamReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamReader</span></code></a> class allows for data to be read using a C++ input |
| stream approach to read fields column by column and row by row. This approach |
| is offered for ease of use and type-safety. It is of course also useful when |
| data must be streamed as files are read and written incrementally.</p> |
| <p>Please note that the performance of the <a class="reference internal" href="api/formats.html#_CPPv4N7parquet12StreamReaderE" title="parquet::StreamReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamReader</span></code></a> will not |
| be as good due to the type checking and the fact that column values |
| are processed one at a time.</p> |
| <section id="filereader"> |
| <h3>FileReader<a class="headerlink" href="#filereader" title="Permalink to this heading">¶</a></h3> |
| <p>To read Parquet data into Arrow structures, use <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileReaderE" title="parquet::arrow::FileReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::FileReader</span></code></a>. |
| To construct, it requires a <a class="reference internal" href="api/io.html#_CPPv4N5arrow2io16RandomAccessFileE" title="arrow::io::RandomAccessFile"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">::arrow::io::RandomAccessFile</span></code></a> instance |
| representing the input file. To read the whole file at once, |
| use <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileReader9ReadTableEPNSt10shared_ptrIN5arrow5TableEEE" title="parquet::arrow::FileReader::ReadTable"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::FileReader::ReadTable()</span></code></a>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// #include "arrow/io/api.h"</span> |
| <span class="c1">// #include "arrow/parquet/arrow/reader.h"</span> |
| |
| <span class="n">arrow</span><span class="o">::</span><span class="n">MemoryPool</span><span class="o">*</span><span class="w"> </span><span class="n">pool</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">();</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">RandomAccessFile</span><span class="o">></span><span class="w"> </span><span class="n">input</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">ReadableFile</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="n">path_to_file</span><span class="p">));</span> |
| |
| <span class="c1">// Open Parquet file reader</span> |
| <span class="hll"><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">FileReader</span><span class="o">></span><span class="w"> </span><span class="n">arrow_reader</span><span class="p">;</span> |
| </span><span class="hll"><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">OpenFile</span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">pool</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">arrow_reader</span><span class="p">));</span> |
| </span> |
| <span class="c1">// Read entire file as a single Arrow table</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">Table</span><span class="o">></span><span class="w"> </span><span class="n">table</span><span class="p">;</span> |
| <span class="hll"><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">arrow_reader</span><span class="o">-></span><span class="n">ReadTable</span><span class="p">(</span><span class="o">&</span><span class="n">table</span><span class="p">));</span> |
| </span></pre></div> |
| </div> |
| <p>Finer-grained options are available through the |
| <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow17FileReaderBuilderE" title="parquet::arrow::FileReaderBuilder"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::FileReaderBuilder</span></code></a> helper class, which accepts the <a class="reference internal" href="api/formats.html#_CPPv4N7parquet16ReaderPropertiesE" title="parquet::ReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ReaderProperties</span></code></a> |
| and <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowReaderPropertiesE" title="parquet::ArrowReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ArrowReaderProperties</span></code></a> classes.</p> |
| <p>For reading as a stream of batches, use the <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileReader20GetRecordBatchReaderEPNSt10unique_ptrIN5arrow17RecordBatchReaderEEE" title="parquet::arrow::FileReader::GetRecordBatchReader"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::FileReader::GetRecordBatchReader()</span></code></a> |
| method to retrieve a <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::RecordBatchReader</span></code>. It will use the batch |
| size set in <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowReaderPropertiesE" title="parquet::ArrowReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ArrowReaderProperties</span></code></a>.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// #include "arrow/io/api.h"</span> |
| <span class="c1">// #include "arrow/parquet/arrow/reader.h"</span> |
| |
| <span class="n">arrow</span><span class="o">::</span><span class="n">MemoryPool</span><span class="o">*</span><span class="w"> </span><span class="n">pool</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">();</span> |
| |
| <span class="c1">// Configure general Parquet reader settings</span> |
| <span class="k">auto</span><span class="w"> </span><span class="n">reader_properties</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ReaderProperties</span><span class="p">(</span><span class="n">pool</span><span class="p">);</span> |
| <span class="n">reader_properties</span><span class="p">.</span><span class="n">set_buffer_size</span><span class="p">(</span><span class="mi">4096</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">4</span><span class="p">);</span> |
| <span class="n">reader_properties</span><span class="p">.</span><span class="n">enable_buffered_stream</span><span class="p">();</span> |
| |
| <span class="c1">// Configure Arrow-specific Parquet reader settings</span> |
| <span class="k">auto</span><span class="w"> </span><span class="n">arrow_reader_props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowReaderProperties</span><span class="p">();</span> |
| <span class="n">arrow_reader_props</span><span class="p">.</span><span class="n">set_batch_size</span><span class="p">(</span><span class="mi">128</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">1024</span><span class="p">);</span><span class="w"> </span><span class="c1">// default 64 * 1024</span> |
| |
| <span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">FileReaderBuilder</span><span class="w"> </span><span class="n">reader_builder</span><span class="p">;</span> |
| <span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">reader_builder</span><span class="p">.</span><span class="n">OpenFile</span><span class="p">(</span><span class="n">path_to_file</span><span class="p">,</span><span class="w"> </span><span class="cm">/*memory_map=*/</span><span class="nb">false</span><span class="p">,</span><span class="w"> </span><span class="n">reader_properties</span><span class="p">));</span> |
| <span class="n">reader_builder</span><span class="p">.</span><span class="n">memory_pool</span><span class="p">(</span><span class="n">pool</span><span class="p">);</span> |
| <span class="n">reader_builder</span><span class="p">.</span><span class="n">properties</span><span class="p">(</span><span class="n">arrow_reader_props</span><span class="p">);</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">FileReader</span><span class="o">></span><span class="w"> </span><span class="n">arrow_reader</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">arrow_reader</span><span class="p">,</span><span class="w"> </span><span class="n">reader_builder</span><span class="p">.</span><span class="n">Build</span><span class="p">());</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><::</span><span class="n">arrow</span><span class="o">::</span><span class="n">RecordBatchReader</span><span class="o">></span><span class="w"> </span><span class="n">rb_reader</span><span class="p">;</span> |
| <span class="hll"><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">arrow_reader</span><span class="o">-></span><span class="n">GetRecordBatchReader</span><span class="p">(</span><span class="o">&</span><span class="n">rb_reader</span><span class="p">));</span> |
| </span> |
| <span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">arrow</span><span class="o">::</span><span class="n">Result</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">RecordBatch</span><span class="o">>></span><span class="w"> </span><span class="n">maybe_batch</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="o">*</span><span class="n">rb_reader</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="c1">// Operate on each batch...</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p>For reading multi-file datasets or pushing down filters to prune row groups, |
| see <a class="reference internal" href="dataset.html#cpp-dataset"><span class="std std-ref">Tabular Datasets</span></a>.</p> |
| </div> |
| <section id="performance-and-memory-efficiency"> |
| <h4>Performance and Memory Efficiency<a class="headerlink" href="#performance-and-memory-efficiency" title="Permalink to this heading">¶</a></h4> |
| <p>For remote filesystems, use read coalescing (pre-buffering) to reduce number of API calls:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">arrow_reader_props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowReaderProperties</span><span class="p">();</span> |
| <span class="n">reader_properties</span><span class="p">.</span><span class="n">set_prebuffer</span><span class="p">(</span><span class="nb">true</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>The defaults are generally tuned towards good performance, but parallel column |
| decoding is off by default. Enable it in the constructor of <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowReaderPropertiesE" title="parquet::ArrowReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ArrowReaderProperties</span></code></a>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">arrow_reader_props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowReaderProperties</span><span class="p">(</span><span class="cm">/*use_threads=*/</span><span class="nb">true</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>If memory efficiency is more important than performance, then:</p> |
| <ol class="arabic simple"> |
| <li><p>Do <em>not</em> turn on read coalescing (pre-buffering) in <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowReaderPropertiesE" title="parquet::ArrowReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">parquet::ArrowReaderProperties</span></code></a>.</p></li> |
| <li><p>Read data in batches using <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileReader20GetRecordBatchReaderEPNSt10unique_ptrIN5arrow17RecordBatchReaderEEE" title="parquet::arrow::FileReader::GetRecordBatchReader"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::FileReader::GetRecordBatchReader()</span></code></a>.</p></li> |
| <li><p>Turn on <code class="docutils literal notranslate"><span class="pre">enable_buffered_stream</span></code> in <a class="reference internal" href="api/formats.html#_CPPv4N7parquet16ReaderPropertiesE" title="parquet::ReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">parquet::ReaderProperties</span></code></a>.</p></li> |
| </ol> |
| <p>In addition, if you know certain columns contain many repeated values, you can |
| read them as <a class="reference internal" href="../format/Glossary.html#term-dictionary-encoding"><span class="xref std std-term">dictionary encoded</span></a> columns. This is |
| enabled with the <code class="docutils literal notranslate"><span class="pre">set_read_dictionary</span></code> setting on <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowReaderPropertiesE" title="parquet::ArrowReaderProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ArrowReaderProperties</span></code></a>. |
| If the files were written with Arrow C++ and the <code class="docutils literal notranslate"><span class="pre">store_schema</span></code> was activated, |
| then the original Arrow schema will be automatically read and will override this |
| setting.</p> |
| </section> |
| </section> |
| <section id="streamreader"> |
| <h3>StreamReader<a class="headerlink" href="#streamreader" title="Permalink to this heading">¶</a></h3> |
| <p>The <a class="reference internal" href="api/formats.html#_CPPv4N7parquet12StreamReaderE" title="parquet::StreamReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamReader</span></code></a> allows for Parquet files to be read using |
| standard C++ input operators which ensures type-safety.</p> |
| <p>Please note that types must match the schema exactly i.e. if the |
| schema field is an unsigned 16-bit integer then you must supply a |
| <code class="docutils literal notranslate"><span class="pre">uint16_t</span></code> type.</p> |
| <p>Exceptions are used to signal errors. A <a class="reference internal" href="api/support.html#_CPPv4N7parquet16ParquetExceptionE" title="parquet::ParquetException"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ParquetException</span></code></a> is |
| thrown in the following circumstances:</p> |
| <ul class="simple"> |
| <li><p>Attempt to read field by supplying the incorrect type.</p></li> |
| <li><p>Attempt to read beyond end of row.</p></li> |
| <li><p>Attempt to read beyond end of file.</p></li> |
| </ul> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"arrow/io/file.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"parquet/stream_reader.h"</span> |
| |
| <span class="p">{</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">ReadableFile</span><span class="o">></span><span class="w"> </span><span class="n">infile</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="n">PARQUET_ASSIGN_OR_THROW</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">infile</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">ReadableFile</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="s">"test.parquet"</span><span class="p">));</span> |
| |
| <span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">StreamReader</span><span class="w"> </span><span class="n">stream</span><span class="p">{</span><span class="n">parquet</span><span class="o">::</span><span class="n">ParquetFileReader</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="n">infile</span><span class="p">)};</span> |
| |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">article</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="n">price</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">quantity</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="o">!</span><span class="n">stream</span><span class="p">.</span><span class="n">eof</span><span class="p">()</span><span class="w"> </span><span class="p">)</span> |
| <span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">stream</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">article</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">price</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">quantity</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">EndRow</span><span class="p">;</span> |
| <span class="w"> </span><span class="c1">// ...</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| <section id="writing-parquet-files"> |
| <h2>Writing Parquet files<a class="headerlink" href="#writing-parquet-files" title="Permalink to this heading">¶</a></h2> |
| <section id="writetable"> |
| <h3>WriteTable<a class="headerlink" href="#writetable" title="Permalink to this heading">¶</a></h3> |
| <p>The <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10WriteTableERKN5arrow5TableEP10MemoryPoolNSt10shared_ptrIN5arrow2io12OutputStreamEEE7int64_tNSt10shared_ptrI16WriterPropertiesEENSt10shared_ptrI21ArrowWriterPropertiesEE" title="parquet::arrow::WriteTable"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::WriteTable()</span></code></a> function writes an entire |
| <a class="reference internal" href="api/table.html#_CPPv4N5arrow5TableE" title="arrow::Table"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">::arrow::Table</span></code></a> to an output file.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// #include "parquet/arrow/writer.h"</span> |
| <span class="c1">// #include "arrow/util/type_fwd.h"</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowWriterProperties</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="p">;</span> |
| |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">Table</span><span class="o">></span><span class="w"> </span><span class="n">table</span><span class="p">,</span><span class="w"> </span><span class="n">GetTable</span><span class="p">());</span> |
| |
| <span class="c1">// Choose compression</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">WriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">props</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">().</span><span class="n">compression</span><span class="p">(</span><span class="n">arrow</span><span class="o">::</span><span class="n">Compression</span><span class="o">::</span><span class="n">SNAPPY</span><span class="p">)</span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| |
| <span class="c1">// Opt to store Arrow schema for easier reads back into Arrow</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">ArrowWriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">arrow_props</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">ArrowWriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">().</span><span class="n">store_schema</span><span class="p">()</span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">></span><span class="w"> </span><span class="n">outfile</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="n">path_to_file</span><span class="p">));</span> |
| |
| <span class="hll"><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">WriteTable</span><span class="p">(</span><span class="o">*</span><span class="n">table</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> |
| </span><span class="hll"><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">(),</span><span class="w"> </span><span class="n">outfile</span><span class="p">,</span> |
| </span><span class="hll"><span class="w"> </span><span class="cm">/*chunk_size=*/</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="n">props</span><span class="p">,</span><span class="w"> </span><span class="n">arrow_props</span><span class="p">));</span> |
| </span></pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Column compression is off by default in C++. See <a class="reference internal" href="#parquet-writer-properties"><span class="std std-ref">below</span></a> |
| for how to choose a compression codec in the writer properties.</p> |
| </div> |
| <p>To write out data batch-by-batch, use <a class="reference internal" href="api/formats.html#_CPPv4N7parquet5arrow10FileWriterE" title="parquet::arrow::FileWriter"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::FileWriter</span></code></a>.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// #include "parquet/arrow/writer.h"</span> |
| <span class="c1">// #include "arrow/util/type_fwd.h"</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowWriterProperties</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="p">;</span> |
| |
| <span class="c1">// Data is in RBR</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">RecordBatchReader</span><span class="o">></span><span class="w"> </span><span class="n">batch_stream</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">batch_stream</span><span class="p">,</span><span class="w"> </span><span class="n">GetRBR</span><span class="p">());</span> |
| |
| <span class="c1">// Choose compression</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">WriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">props</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">().</span><span class="n">compression</span><span class="p">(</span><span class="n">arrow</span><span class="o">::</span><span class="n">Compression</span><span class="o">::</span><span class="n">SNAPPY</span><span class="p">)</span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| |
| <span class="c1">// Opt to store Arrow schema for easier reads back into Arrow</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">ArrowWriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">arrow_props</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">ArrowWriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">().</span><span class="n">store_schema</span><span class="p">()</span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| |
| <span class="c1">// Create a writer</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">></span><span class="w"> </span><span class="n">outfile</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="n">path_to_file</span><span class="p">));</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">FileWriter</span><span class="o">></span><span class="w"> </span><span class="n">writer</span><span class="p">;</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span> |
| <span class="hll"><span class="w"> </span><span class="n">writer</span><span class="p">,</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">FileWriter</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="o">*</span><span class="n">batch_stream</span><span class="o">-></span><span class="n">schema</span><span class="p">().</span><span class="n">get</span><span class="p">(),</span> |
| </span><span class="hll"><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">(),</span><span class="w"> </span><span class="n">outfile</span><span class="p">,</span> |
| </span><span class="hll"><span class="w"> </span><span class="n">props</span><span class="p">,</span><span class="w"> </span><span class="n">arrow_props</span><span class="p">));</span> |
| </span> |
| <span class="c1">// Write each batch as a row_group</span> |
| <span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">arrow</span><span class="o">::</span><span class="n">Result</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">RecordBatch</span><span class="o">>></span><span class="w"> </span><span class="n">maybe_batch</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="o">*</span><span class="n">batch_stream</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="k">auto</span><span class="w"> </span><span class="n">batch</span><span class="p">,</span><span class="w"> </span><span class="n">maybe_batch</span><span class="p">);</span> |
| <span class="w"> </span><span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="k">auto</span><span class="w"> </span><span class="n">table</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">Table</span><span class="o">::</span><span class="n">FromRecordBatches</span><span class="p">(</span><span class="n">batch</span><span class="o">-></span><span class="n">schema</span><span class="p">(),</span><span class="w"> </span><span class="p">{</span><span class="n">batch</span><span class="p">}));</span> |
| <span class="hll"><span class="w"> </span><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">writer</span><span class="o">-></span><span class="n">WriteTable</span><span class="p">(</span><span class="o">*</span><span class="n">table</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span><span class="w"> </span><span class="n">batch</span><span class="o">-></span><span class="n">num_rows</span><span class="p">()));</span> |
| </span><span class="p">}</span> |
| |
| <span class="c1">// Write file footer and close</span> |
| <span class="hll"><span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">writer</span><span class="o">-></span><span class="n">Close</span><span class="p">());</span> |
| </span></pre></div> |
| </div> |
| </section> |
| <section id="streamwriter"> |
| <h3>StreamWriter<a class="headerlink" href="#streamwriter" title="Permalink to this heading">¶</a></h3> |
| <p>The <a class="reference internal" href="api/formats.html#_CPPv4N7parquet12StreamWriterE" title="parquet::StreamWriter"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamWriter</span></code></a> allows for Parquet files to be written using |
| standard C++ output operators, similar to reading with the <a class="reference internal" href="api/formats.html#_CPPv4N7parquet12StreamReaderE" title="parquet::StreamReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">StreamReader</span></code></a> |
| class. This type-safe approach also ensures that rows are written without |
| omitting fields and allows for new row groups to be created automatically |
| (after certain volume of data) or explicitly by using the <code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">EndRowGroup</span></code> |
| stream modifier.</p> |
| <p>Exceptions are used to signal errors. A <a class="reference internal" href="api/support.html#_CPPv4N7parquet16ParquetExceptionE" title="parquet::ParquetException"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ParquetException</span></code></a> is |
| thrown in the following circumstances:</p> |
| <ul class="simple"> |
| <li><p>Attempt to write a field using an incorrect type.</p></li> |
| <li><p>Attempt to write too many fields in a row.</p></li> |
| <li><p>Attempt to skip a required field.</p></li> |
| </ul> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"arrow/io/file.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"parquet/stream_writer.h"</span> |
| |
| <span class="p">{</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">></span><span class="w"> </span><span class="n">outfile</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="n">PARQUET_ASSIGN_OR_THROW</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">outfile</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">io</span><span class="o">::</span><span class="n">FileOutputStream</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="s">"test.parquet"</span><span class="p">));</span> |
| |
| <span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">parquet</span><span class="o">::</span><span class="n">schema</span><span class="o">::</span><span class="n">GroupNode</span><span class="o">></span><span class="w"> </span><span class="n">schema</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="c1">// Set up builder with required compression type etc.</span> |
| <span class="w"> </span><span class="c1">// Define schema.</span> |
| <span class="w"> </span><span class="c1">// ...</span> |
| |
| <span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">StreamWriter</span><span class="w"> </span><span class="n">os</span><span class="p">{</span> |
| <span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ParquetFileWriter</span><span class="o">::</span><span class="n">Open</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span><span class="w"> </span><span class="n">schema</span><span class="p">,</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">build</span><span class="p">())};</span> |
| |
| <span class="w"> </span><span class="c1">// Loop over some data structure which provides the required</span> |
| <span class="w"> </span><span class="c1">// fields to be written and write each row.</span> |
| <span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">auto</span><span class="o">&</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">getArticles</span><span class="p">())</span> |
| <span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">os</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n">name</span><span class="p">()</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n">price</span><span class="p">()</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n">quantity</span><span class="p">()</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">EndRow</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="writer-properties"> |
| <span id="parquet-writer-properties"></span><h3>Writer properties<a class="headerlink" href="#writer-properties" title="Permalink to this heading">¶</a></h3> |
| <p>To configure how Parquet files are written, use the <a class="reference internal" href="api/formats.html#_CPPv4N7parquet16WriterProperties7BuilderE" title="parquet::WriterProperties::Builder"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">WriterProperties::Builder</span></code></a>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"parquet/arrow/writer.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"arrow/util/type_fwd.h"</span> |
| |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ParquetVersion</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ParquetDataPageVersion</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">Compression</span><span class="p">;</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">WriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">max_row_group_length</span><span class="p">(</span><span class="mi">64</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">1024</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">created_by</span><span class="p">(</span><span class="s">"My Application"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">version</span><span class="p">(</span><span class="n">ParquetVersion</span><span class="o">::</span><span class="n">PARQUET_2_6</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">data_page_version</span><span class="p">(</span><span class="n">ParquetDataPageVersion</span><span class="o">::</span><span class="n">V2</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">compression</span><span class="p">(</span><span class="n">Compression</span><span class="o">::</span><span class="n">SNAPPY</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">build</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">max_row_group_length</span></code> sets an upper bound on the number of rows per row |
| group that takes precedent over the <code class="docutils literal notranslate"><span class="pre">chunk_size</span></code> passed in the write methods.</p> |
| <p>You can set the version of Parquet to write with <code class="docutils literal notranslate"><span class="pre">version</span></code>, which determines |
| which logical types are available. In addition, you can set the data page version |
| with <code class="docutils literal notranslate"><span class="pre">data_page_version</span></code>. It’s V1 by default; setting to V2 will allow more |
| optimal compression (skipping compressing pages where there isn’t a space |
| benefit), but not all readers support this data page version.</p> |
| <p>Compression is off by default, but to get the most out of Parquet, you should |
| also choose a compression codec. You can choose one for the whole file or |
| choose one for individual columns. If you choose a mix, the file-level option |
| will apply to columns that don’t have a specific compression codec. See |
| <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">::arrow::Compression</span></code> for options.</p> |
| <p>Column data encodings can likewise be applied at the file-level or at the |
| column level. By default, the writer will attempt to dictionary encode all |
| supported columns, unless the dictionary grows too large. This behavior can |
| be changed at file-level or at the column level with <code class="docutils literal notranslate"><span class="pre">disable_dictionary()</span></code>. |
| When not using dictionary encoding, it will fallback to the encoding set for |
| the column or the overall file; by default <code class="docutils literal notranslate"><span class="pre">Encoding::PLAIN</span></code>, but this can |
| be changed with <code class="docutils literal notranslate"><span class="pre">encoding()</span></code>.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"parquet/arrow/writer.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"arrow/util/type_fwd.h"</span> |
| |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">Compression</span><span class="p">;</span> |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">Encoding</span><span class="p">;</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">WriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">compression</span><span class="p">(</span><span class="n">Compression</span><span class="o">::</span><span class="n">SNAPPY</span><span class="p">)</span><span class="w"> </span><span class="c1">// Fallback</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">compression</span><span class="p">(</span><span class="s">"colA"</span><span class="p">,</span><span class="w"> </span><span class="n">Compression</span><span class="o">::</span><span class="n">ZSTD</span><span class="p">)</span><span class="w"> </span><span class="c1">// Only applies to column "colA"</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">encoding</span><span class="p">(</span><span class="n">Encoding</span><span class="o">::</span><span class="n">BIT_PACKED</span><span class="p">)</span><span class="w"> </span><span class="c1">// Fallback</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">encoding</span><span class="p">(</span><span class="s">"colB"</span><span class="p">,</span><span class="w"> </span><span class="n">Encoding</span><span class="o">::</span><span class="n">RLE</span><span class="p">)</span><span class="w"> </span><span class="c1">// Only applies to column "colB"</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">disable_dictionary</span><span class="p">(</span><span class="s">"colB"</span><span class="p">)</span><span class="w"> </span><span class="c1">// Never dictionary-encode column "colB"</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>Statistics are enabled by default for all columns. You can disable statistics for |
| all columns or specific columns using <code class="docutils literal notranslate"><span class="pre">disable_statistics</span></code> on the builder. |
| There is a <code class="docutils literal notranslate"><span class="pre">max_statistics_size</span></code> which limits the maximum number of bytes that |
| may be used for min and max values, useful for types like strings or binary blobs. |
| If a column has enabled page index using <code class="docutils literal notranslate"><span class="pre">enable_write_page_index</span></code>, then it does |
| not write statistics to the page header because it is duplicated in the ColumnIndex.</p> |
| <p>There are also Arrow-specific settings that can be configured with |
| <a class="reference internal" href="api/formats.html#_CPPv4N7parquet21ArrowWriterPropertiesE" title="parquet::ArrowWriterProperties"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">parquet::ArrowWriterProperties</span></code></a>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"parquet/arrow/writer.h"</span> |
| |
| <span class="k">using</span><span class="w"> </span><span class="n">parquet</span><span class="o">::</span><span class="n">ArrowWriterProperties</span><span class="p">;</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">ArrowWriterProperties</span><span class="o">></span><span class="w"> </span><span class="n">arrow_props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ArrowWriterProperties</span><span class="o">::</span><span class="n">Builder</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">enable_deprecated_int96_timestamps</span><span class="p">()</span><span class="w"> </span><span class="c1">// default False</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">store_schema</span><span class="p">()</span><span class="w"> </span><span class="c1">// default False</span> |
| <span class="w"> </span><span class="o">-></span><span class="n">build</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>These options mostly dictate how Arrow types are converted to Parquet types. |
| Turning on <code class="docutils literal notranslate"><span class="pre">store_schema</span></code> will cause the writer to store the serialized Arrow |
| schema within the file metadata. Since there is no bijection between Parquet |
| schemas and Arrow schemas, storing the Arrow schema allows the Arrow reader |
| to more faithfully recreate the original data. This mapping from Parquet types |
| back to original Arrow types includes:</p> |
| <ul class="simple"> |
| <li><p>Reading timestamps with original timezone information (Parquet does not |
| support time zones);</p></li> |
| <li><p>Reading Arrow types from their storage types (such as Duration from int64 |
| columns);</p></li> |
| <li><p>Reading string and binary columns back into large variants with 64-bit offsets;</p></li> |
| <li><p>Reading back columns as dictionary encoded (whether an Arrow column and |
| the serialized Parquet version are dictionary encoded are independent).</p></li> |
| </ul> |
| </section> |
| </section> |
| <section id="supported-parquet-features"> |
| <h2>Supported Parquet features<a class="headerlink" href="#supported-parquet-features" title="Permalink to this heading">¶</a></h2> |
| <p>The Parquet format has many features, and Parquet C++ supports a subset of them.</p> |
| <section id="page-types"> |
| <h3>Page types<a class="headerlink" href="#page-types" title="Permalink to this heading">¶</a></h3> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Page type</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>DATA_PAGE</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>DATA_PAGE_V2</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>DICTIONARY_PAGE</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <p><em>Unsupported page type:</em> INDEX_PAGE. When reading a Parquet file, pages of |
| this type are ignored.</p> |
| </section> |
| <section id="compression"> |
| <h3>Compression<a class="headerlink" href="#compression" title="Permalink to this heading">¶</a></h3> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Compression codec</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>SNAPPY</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>GZIP</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>BROTLI</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>LZ4</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>ZSTD</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) On the read side, Parquet C++ is able to decompress both the regular |
| LZ4 block format and the ad-hoc Hadoop LZ4 format used by the |
| <a class="reference external" href="https://github.com/apache/parquet-mr">reference Parquet implementation</a>. |
| On the write side, Parquet C++ always generates the ad-hoc Hadoop LZ4 format.</p></li> |
| </ul> |
| <p><em>Unsupported compression codec:</em> LZO.</p> |
| </section> |
| <section id="encodings"> |
| <h3>Encodings<a class="headerlink" href="#encodings" title="Permalink to this heading">¶</a></h3> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Encoding</p></th> |
| <th class="head"><p>Reading</p></th> |
| <th class="head"><p>Writing</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>PLAIN</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>PLAIN_DICTIONARY</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>BIT_PACKED</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>RLE</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>RLE_DICTIONARY</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(2)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>BYTE_STREAM_SPLIT</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>DELTA_BINARY_PACKED</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>DELTA_BYTE_ARRAY</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>DELTA_LENGTH_BYTE_ARRAY</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) Only supported for encoding definition and repetition levels, |
| and boolean values.</p></li> |
| <li><p>(2) On the write path, RLE_DICTIONARY is only enabled if Parquet format version |
| 2.4 or greater is selected in <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">WriterProperties::version()</span></code>.</p></li> |
| </ul> |
| </section> |
| <section id="types"> |
| <h3>Types<a class="headerlink" href="#types" title="Permalink to this heading">¶</a></h3> |
| <section id="physical-types"> |
| <h4>Physical types<a class="headerlink" href="#physical-types" title="Permalink to this heading">¶</a></h4> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Physical type</p></th> |
| <th class="head"><p>Mapped Arrow type</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>BOOLEAN</p></td> |
| <td><p>Boolean</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>INT32</p></td> |
| <td><p>Int32 / other</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>INT64</p></td> |
| <td><p>Int64 / other</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>INT96</p></td> |
| <td><p>Timestamp (nanoseconds)</p></td> |
| <td><p>(2)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>FLOAT</p></td> |
| <td><p>Float32</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>DOUBLE</p></td> |
| <td><p>Float64</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>BYTE_ARRAY</p></td> |
| <td><p>Binary / other</p></td> |
| <td><p>(1) (3)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>FIXED_LENGTH_BYTE_ARRAY</p></td> |
| <td><p>FixedSizeBinary / other</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) Can be mapped to other Arrow types, depending on the logical type |
| (see below).</p></li> |
| <li><p>(2) On the write side, <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">ArrowWriterProperties::support_deprecated_int96_timestamps()</span></code> |
| must be enabled.</p></li> |
| <li><p>(3) On the write side, an Arrow LargeBinary can also mapped to BYTE_ARRAY.</p></li> |
| </ul> |
| </section> |
| <section id="logical-types"> |
| <h4>Logical types<a class="headerlink" href="#logical-types" title="Permalink to this heading">¶</a></h4> |
| <p>Specific logical types can override the default Arrow type mapping for a given |
| physical type.</p> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Logical type</p></th> |
| <th class="head"><p>Physical type</p></th> |
| <th class="head"><p>Mapped Arrow type</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>NULL</p></td> |
| <td><p>Any</p></td> |
| <td><p>Null</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>INT</p></td> |
| <td><p>INT32</p></td> |
| <td><p>Int8 / UInt8 / Int16 / |
| UInt16 / Int32 / UInt32</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>INT</p></td> |
| <td><p>INT64</p></td> |
| <td><p>Int64 / UInt64</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>DECIMAL</p></td> |
| <td><p>INT32 / INT64 / BYTE_ARRAY |
| / FIXED_LENGTH_BYTE_ARRAY</p></td> |
| <td><p>Decimal128 / Decimal256</p></td> |
| <td><p>(2)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>DATE</p></td> |
| <td><p>INT32</p></td> |
| <td><p>Date32</p></td> |
| <td><p>(3)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>TIME</p></td> |
| <td><p>INT32</p></td> |
| <td><p>Time32 (milliseconds)</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>TIME</p></td> |
| <td><p>INT64</p></td> |
| <td><p>Time64 (micro- or |
| nanoseconds)</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>TIMESTAMP</p></td> |
| <td><p>INT64</p></td> |
| <td><p>Timestamp (milli-, micro- |
| or nanoseconds)</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>STRING</p></td> |
| <td><p>BYTE_ARRAY</p></td> |
| <td><p>Utf8</p></td> |
| <td><p>(4)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>LIST</p></td> |
| <td><p>Any</p></td> |
| <td><p>List</p></td> |
| <td><p>(5)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>MAP</p></td> |
| <td><p>Any</p></td> |
| <td><p>Map</p></td> |
| <td><p>(6)</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) On the write side, the Parquet physical type INT32 is generated.</p></li> |
| <li><p>(2) On the write side, a FIXED_LENGTH_BYTE_ARRAY is always emitted.</p></li> |
| <li><p>(3) On the write side, an Arrow Date64 is also mapped to a Parquet DATE INT32.</p></li> |
| <li><p>(4) On the write side, an Arrow LargeUtf8 is also mapped to a Parquet STRING.</p></li> |
| <li><p>(5) On the write side, an Arrow LargeList or FixedSizedList is also mapped to |
| a Parquet LIST.</p></li> |
| <li><p>(6) On the read side, a key with multiple values does not get deduplicated, |
| in contradiction with the |
| <a class="reference external" href="https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#maps">Parquet specification</a>.</p></li> |
| </ul> |
| <p><em>Unsupported logical types:</em> JSON, BSON, UUID. If such a type is encountered |
| when reading a Parquet file, the default physical type mapping is used (for |
| example, a Parquet JSON column may be read as Arrow Binary or FixedSizeBinary).</p> |
| </section> |
| <section id="converted-types"> |
| <h4>Converted types<a class="headerlink" href="#converted-types" title="Permalink to this heading">¶</a></h4> |
| <p>While converted types are deprecated in the Parquet format (they are superceded |
| by logical types), they are recognized and emitted by the Parquet C++ |
| implementation so as to maximize compatibility with other Parquet |
| implementations.</p> |
| </section> |
| <section id="special-cases"> |
| <h4>Special cases<a class="headerlink" href="#special-cases" title="Permalink to this heading">¶</a></h4> |
| <p>An Arrow Extension type is written out as its storage type. It can still |
| be recreated at read time using Parquet metadata (see “Roundtripping Arrow |
| types” below).</p> |
| <p>An Arrow Dictionary type is written out as its value type. It can still |
| be recreated at read time using Parquet metadata (see “Roundtripping Arrow |
| types” below).</p> |
| </section> |
| <section id="roundtripping-arrow-types"> |
| <h4>Roundtripping Arrow types<a class="headerlink" href="#roundtripping-arrow-types" title="Permalink to this heading">¶</a></h4> |
| <p>While there is no bijection between Arrow types and Parquet types, it is |
| possible to serialize the Arrow schema as part of the Parquet file metadata. |
| This is enabled using <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">ArrowWriterProperties::store_schema()</span></code>.</p> |
| <p>On the read path, the serialized schema will be automatically recognized |
| and will recreate the original Arrow data, converting the Parquet data as |
| required (for example, a LargeList will be recreated from the Parquet LIST |
| type).</p> |
| <p>As an example, when serializing an Arrow LargeList to Parquet:</p> |
| <ul class="simple"> |
| <li><p>The data is written out as a Parquet LIST</p></li> |
| <li><p>When read back, the Parquet LIST data is decoded as an Arrow LargeList if |
| <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">ArrowWriterProperties::store_schema()</span></code> was enabled when writing the file; |
| otherwise, it is decoded as an Arrow List.</p></li> |
| </ul> |
| <section id="serialization-details"> |
| <h5>Serialization details<a class="headerlink" href="#serialization-details" title="Permalink to this heading">¶</a></h5> |
| <p>The Arrow schema is serialized as a <a class="reference internal" href="../format/Columnar.html#format-ipc"><span class="std std-ref">Arrow IPC</span></a> schema message, |
| then base64-encoded and stored under the <code class="docutils literal notranslate"><span class="pre">ARROW:schema</span></code> metadata key in |
| the Parquet file metadata.</p> |
| </section> |
| </section> |
| <section id="limitations"> |
| <h4>Limitations<a class="headerlink" href="#limitations" title="Permalink to this heading">¶</a></h4> |
| <p>Writing or reading back FixedSizedList data with null entries is not supported.</p> |
| </section> |
| </section> |
| <section id="encryption"> |
| <h3>Encryption<a class="headerlink" href="#encryption" title="Permalink to this heading">¶</a></h3> |
| <p>Parquet C++ implements all features specified in the |
| <a class="reference external" href="https://github.com/apache/parquet-format/blob/master/Encryption.md">encryption specification</a>, |
| except for encryption of column index and bloom filter modules.</p> |
| <p>More specifically, Parquet C++ supports:</p> |
| <ul class="simple"> |
| <li><p>AES_GCM_V1 and AES_GCM_CTR_V1 encryption algorithms.</p></li> |
| <li><p>AAD suffix for Footer, ColumnMetaData, Data Page, Dictionary Page, |
| Data PageHeader, Dictionary PageHeader module types. Other module types |
| (ColumnIndex, OffsetIndex, BloomFilter Header, BloomFilter Bitset) are not |
| supported.</p></li> |
| <li><p>EncryptionWithFooterKey and EncryptionWithColumnKey modes.</p></li> |
| <li><p>Encrypted Footer and Plaintext Footer modes.</p></li> |
| </ul> |
| </section> |
| <section id="miscellaneous"> |
| <h3>Miscellaneous<a class="headerlink" href="#miscellaneous" title="Permalink to this heading">¶</a></h3> |
| <table class="table"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Feature</p></th> |
| <th class="head"><p>Reading</p></th> |
| <th class="head"><p>Writing</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>Column Index</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>Offset Index</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>Bloom Filter</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td><p>(2)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>CRC checksums</p></td> |
| <td><p>✓</p></td> |
| <td><p>✓</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) Access to the Column and Offset Index structures is provided, but |
| data read APIs do not currently make any use of them.</p></li> |
| <li><p>(2) APIs are provided for creating, serializing and deserializing Bloom |
| Filters, but they are not integrated into data read APIs.</p></li> |
| </ul> |
| </section> |
| </section> |
| </section> |
| |
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