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| <p>The Arrow C++ library is comprised of different parts, each of which serves |
| a specific purpose.</p> |
| <section id="the-physical-layer"> |
| <h2>The physical layer<a class="headerlink" href="#the-physical-layer" title="Permalink to this heading">#</a></h2> |
| <p><strong>Memory management</strong> abstractions provide a uniform API over memory that |
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| mapping of a file or a static memory area. In particular, the <strong>buffer</strong> |
| abstraction represents a contiguous area of physical data.</p> |
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| <section id="the-one-dimensional-layer"> |
| <h2>The one-dimensional layer<a class="headerlink" href="#the-one-dimensional-layer" title="Permalink to this heading">#</a></h2> |
| <p><strong>Data types</strong> govern the <em>logical</em> interpretation of <em>physical</em> data. |
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| <h2>The two-dimensional layer<a class="headerlink" href="#the-two-dimensional-layer" title="Permalink to this heading">#</a></h2> |
| <p><strong>Schemas</strong> describe a logical collection of several pieces of data, |
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| <p><strong>Tables</strong> are collections of chunked array in accordance to a schema. They |
| are the most capable dataset-providing abstraction in Arrow.</p> |
| <p><strong>Record batches</strong> are collections of contiguous arrays, described |
| by a schema. They allow incremental construction or serialization of tables.</p> |
| </section> |
| <section id="the-compute-layer"> |
| <h2>The compute layer<a class="headerlink" href="#the-compute-layer" title="Permalink to this heading">#</a></h2> |
| <p><strong>Datums</strong> are flexible dataset references, able to hold for example an array or table |
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| given set of datums representing input and output parameters to the functions.</p> |
| <p><strong>Acero</strong> (pronounced [aˈsɜɹo] / ah-SERR-oh) is a streaming execution engine that allows |
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| </section> |
| <section id="the-io-layer"> |
| <h2>The IO layer<a class="headerlink" href="#the-io-layer" title="Permalink to this heading">#</a></h2> |
| <p><strong>Streams</strong> allow untyped sequential or seekable access over external data |
| of various kinds (for example compressed or memory-mapped).</p> |
| </section> |
| <section id="the-inter-process-communication-ipc-layer"> |
| <h2>The Inter-Process Communication (IPC) layer<a class="headerlink" href="#the-inter-process-communication-ipc-layer" title="Permalink to this heading">#</a></h2> |
| <p>A <strong>messaging format</strong> allows interchange of Arrow data between processes, using |
| as few copies as possible.</p> |
| </section> |
| <section id="the-file-formats-layer"> |
| <h2>The file formats layer<a class="headerlink" href="#the-file-formats-layer" title="Permalink to this heading">#</a></h2> |
| <p>Reading and writing Arrow data from/to various file formats is possible, for |
| example <strong>Parquet</strong>, <strong>CSV</strong>, <strong>Orc</strong> or the Arrow-specific <strong>Feather</strong> format.</p> |
| </section> |
| <section id="the-devices-layer"> |
| <h2>The devices layer<a class="headerlink" href="#the-devices-layer" title="Permalink to this heading">#</a></h2> |
| <p>Basic <strong>CUDA</strong> integration is provided, allowing to describe Arrow data backed |
| by GPU-allocated memory.</p> |
| </section> |
| <section id="the-filesystem-layer"> |
| <h2>The filesystem layer<a class="headerlink" href="#the-filesystem-layer" title="Permalink to this heading">#</a></h2> |
| <p>A filesystem abstraction allows reading and writing data from different storage |
| backends, such as the local filesystem or a S3 bucket.</p> |
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