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| R |
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| Logical types |
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| Converted types |
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| Roundtripping Arrow types |
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| <div> |
| |
| <div class="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 headline">¶</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/documentation/latest/">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> |
| <div class="section" id="supported-parquet-features"> |
| <h2>Supported Parquet features<a class="headerlink" href="#supported-parquet-features" title="Permalink to this headline">¶</a></h2> |
| <p>The Parquet format has many features, and Parquet C++ supports a subset of them.</p> |
| <div class="section" id="page-types"> |
| <h3>Page types<a class="headerlink" href="#page-types" title="Permalink to this headline">¶</a></h3> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 68%" /> |
| <col style="width: 32%" /> |
| </colgroup> |
| <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> |
| </div> |
| <div class="section" id="compression"> |
| <h3>Compression<a class="headerlink" href="#compression" title="Permalink to this headline">¶</a></h3> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 68%" /> |
| <col style="width: 32%" /> |
| </colgroup> |
| <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> |
| </div> |
| <div class="section" id="encodings"> |
| <h3>Encodings<a class="headerlink" href="#encodings" title="Permalink to this headline">¶</a></h3> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 74%" /> |
| <col style="width: 26%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Encoding</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>PLAIN</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>PLAIN_DICTIONARY</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>BIT_PACKED</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>RLE</p></td> |
| <td><p>(1)</p></td> |
| </tr> |
| <tr class="row-even"><td><p>RLE_DICTIONARY</p></td> |
| <td><p>(2)</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>BYTE_STREAM_SPLIT</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul class="simple"> |
| <li><p>(1) Only supported for encoding definition and repetition levels, not values.</p></li> |
| <li><p>(2) On the write path, RLE_DICTIONARY is only enabled if Parquet format version |
| 2.0 (or potentially greater) is selected in <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">WriterProperties::version()</span></code>.</p></li> |
| </ul> |
| <p><em>Unsupported encodings:</em> DELTA_BINARY_PACKED, DELTA_LENGTH_BYTE_ARRAY, |
| DELTA_BYTE_ARRAY.</p> |
| </div> |
| <div class="section" id="types"> |
| <h3>Types<a class="headerlink" href="#types" title="Permalink to this headline">¶</a></h3> |
| <div class="section" id="physical-types"> |
| <h4>Physical types<a class="headerlink" href="#physical-types" title="Permalink to this headline">¶</a></h4> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 41%" /> |
| <col style="width: 40%" /> |
| <col style="width: 19%" /> |
| </colgroup> |
| <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> |
| </div> |
| <div class="section" id="logical-types"> |
| <h4>Logical types<a class="headerlink" href="#logical-types" title="Permalink to this headline">¶</a></h4> |
| <p>Specific logical types can override the default Arrow type mapping for a given |
| physical type.</p> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 22%" /> |
| <col style="width: 34%" /> |
| <col style="width: 33%" /> |
| <col style="width: 11%" /> |
| </colgroup> |
| <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> |
| </div> |
| <div class="section" id="converted-types"> |
| <h4>Converted types<a class="headerlink" href="#converted-types" title="Permalink to this headline">¶</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> |
| </div> |
| <div class="section" id="special-cases"> |
| <h4>Special cases<a class="headerlink" href="#special-cases" title="Permalink to this headline">¶</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> |
| </div> |
| <div class="section" id="roundtripping-arrow-types"> |
| <h4>Roundtripping Arrow types<a class="headerlink" href="#roundtripping-arrow-types" title="Permalink to this headline">¶</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 exemple, 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> |
| <div class="section" id="serialization-details"> |
| <h5>Serialization details<a class="headerlink" href="#serialization-details" title="Permalink to this headline">¶</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> |
| </div> |
| </div> |
| <div class="section" id="limitations"> |
| <h4>Limitations<a class="headerlink" href="#limitations" title="Permalink to this headline">¶</a></h4> |
| <p>Writing or reading back FixedSizedList data with null entries is not supported.</p> |
| </div> |
| </div> |
| <div class="section" id="encryption"> |
| <h3>Encryption<a class="headerlink" href="#encryption" title="Permalink to this headline">¶</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> |
| </div> |
| </div> |
| <div class="section" id="reading-parquet-files"> |
| <h2>Reading Parquet files<a class="headerlink" href="#reading-parquet-files" title="Permalink to this headline">¶</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 for an entire |
| file or row group into an <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>.</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> and <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> classes allow for |
| data to be written using a C++ input/output streams approach to |
| read/write 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> and |
| <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> classes will not be as good due to the type |
| checking and the fact that column values are processed one at a time.</p> |
| <div class="section" id="filereader"> |
| <h3>FileReader<a class="headerlink" href="#filereader" title="Permalink to this headline">¶</a></h3> |
| <p>The Parquet <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> 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.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">"arrow/parquet/arrow/reader.h"</span><span class="cp"></span> |
| |
| <span class="p">{</span> |
| <span class="c1">// ...</span> |
| <span class="n">arrow</span><span class="o">::</span><span class="n">Status</span> <span class="n">st</span><span class="p">;</span> |
| <span class="n">arrow</span><span class="o">::</span><span class="n">MemoryPool</span><span class="o">*</span> <span class="n">pool</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="n">input</span> <span class="o">=</span> <span class="p">...;</span> |
| |
| <span class="c1">// Open Parquet file reader</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="n">arrow_reader</span><span class="p">;</span> |
| <span class="n">st</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">OpenFile</span><span class="p">(</span><span class="n">input</span><span class="p">,</span> <span class="n">pool</span><span class="p">,</span> <span class="o">&</span><span class="n">arrow_reader</span><span class="p">);</span> |
| <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">st</span><span class="p">.</span><span class="n">ok</span><span class="p">())</span> <span class="p">{</span> |
| <span class="c1">// Handle error instantiating file reader...</span> |
| <span class="p">}</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="n">table</span><span class="p">;</span> |
| <span class="n">st</span> <span class="o">=</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 class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">st</span><span class="p">.</span><span class="n">ok</span><span class="p">())</span> <span class="p">{</span> |
| <span class="c1">// Handle error reading Parquet data...</span> |
| <span class="p">}</span> |
| <span class="p">}</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.</p> |
| </div> |
| <div class="section" id="streamreader"> |
| <h3>StreamReader<a class="headerlink" href="#streamreader" title="Permalink to this headline">¶</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 |
| uint16_t 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="cpf">"arrow/io/file.h"</span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf">"parquet/stream_reader.h"</span><span class="cp"></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">ReadableFile</span><span class="o">></span> <span class="n">infile</span><span class="p">;</span> |
| |
| <span class="n">PARQUET_ASSIGN_OR_THROW</span><span class="p">(</span> |
| <span class="n">infile</span><span class="p">,</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="n">parquet</span><span class="o">::</span><span class="n">StreamReader</span> <span class="n">os</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="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">article</span><span class="p">;</span> |
| <span class="kt">float</span> <span class="n">price</span><span class="p">;</span> |
| <span class="kt">uint32_t</span> <span class="n">quantity</span><span class="p">;</span> |
| |
| <span class="k">while</span> <span class="p">(</span> <span class="o">!</span><span class="n">os</span><span class="p">.</span><span class="n">eof</span><span class="p">()</span> <span class="p">)</span> |
| <span class="p">{</span> |
| <span class="n">os</span> <span class="o">>></span> <span class="n">article</span> <span class="o">>></span> <span class="n">price</span> <span class="o">>></span> <span class="n">quantity</span> <span class="o">>></span> <span class="n">parquet</span><span class="o">::</span><span class="n">EndRow</span><span class="p">;</span> |
| <span class="c1">// ...</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="writing-parquet-files"> |
| <h2>Writing Parquet files<a class="headerlink" href="#writing-parquet-files" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="writetable"> |
| <h3>WriteTable<a class="headerlink" href="#writetable" title="Permalink to this headline">¶</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="cp">#include</span> <span class="cpf">"parquet/arrow/writer.h"</span><span class="cp"></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="n">outfile</span><span class="p">;</span> |
| <span class="n">PARQUET_ASSIGN_OR_THROW</span><span class="p">(</span> |
| <span class="n">outfile</span><span class="p">,</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="n">PARQUET_THROW_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="n">table</span><span class="p">,</span> <span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">(),</span> <span class="n">outfile</span><span class="p">,</span> <span class="mi">3</span><span class="p">));</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="streamwriter"> |
| <h3>StreamWriter<a class="headerlink" href="#streamwriter" title="Permalink to this headline">¶</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. 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="cpf">"arrow/io/file.h"</span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf">"parquet/stream_writer.h"</span><span class="cp"></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="n">outfile</span><span class="p">;</span> |
| |
| <span class="n">PARQUET_ASSIGN_OR_THROW</span><span class="p">(</span> |
| <span class="n">outfile</span><span class="p">,</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="n">parquet</span><span class="o">::</span><span class="n">WriterProperties</span><span class="o">::</span><span class="n">Builder</span> <span class="n">builder</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">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="n">schema</span><span class="p">;</span> |
| |
| <span class="c1">// Set up builder with required compression type etc.</span> |
| <span class="c1">// Define schema.</span> |
| <span class="c1">// ...</span> |
| |
| <span class="n">parquet</span><span class="o">::</span><span class="n">StreamWriter</span> <span class="n">os</span><span class="p">{</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="n">schema</span><span class="p">,</span> <span class="n">builder</span><span class="p">.</span><span class="n">build</span><span class="p">())};</span> |
| |
| <span class="c1">// Loop over some data structure which provides the required</span> |
| <span class="c1">// fields to be written and write each row.</span> |
| <span class="k">for</span> <span class="p">(</span><span class="k">const</span> <span class="k">auto</span><span class="o">&</span> <span class="nl">a</span> <span class="p">:</span> <span class="n">getArticles</span><span class="p">())</span> |
| <span class="p">{</span> |
| <span class="n">os</span> <span class="o"><<</span> <span class="n">a</span><span class="p">.</span><span class="n">name</span><span class="p">()</span> <span class="o"><<</span> <span class="n">a</span><span class="p">.</span><span class="n">price</span><span class="p">()</span> <span class="o"><<</span> <span class="n">a</span><span class="p">.</span><span class="n">quantity</span><span class="p">()</span> <span class="o"><<</span> <span class="n">parquet</span><span class="o">::</span><span class="n">EndRow</span><span class="p">;</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| |
| </div> |
| |
| |
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