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| |
| <h1 id="library-design">Library Design<a class="headerlink" href="#library-design" title="Permanent link">¶</a></h1> |
| <p>Iceberg C++ splits its code into a few libraries so applications can link only |
| what they need.</p> |
| <h2 id="library-boundaries">Library boundaries<a class="headerlink" href="#library-boundaries" title="Permanent link">¶</a></h2> |
| <h3 id="iceberg"><code>iceberg</code><a class="headerlink" href="#iceberg" title="Permanent link">¶</a></h3> |
| <p>The core library contains schemas, table metadata, manifests, snapshots, table |
| updates, catalog interfaces, Puffin files, etc. It also owns the Arrow C Data |
| interface and the nanoarrow-based utilities used by core metadata and data |
| processing code. These utilities do not depend on the Arrow C++ library.</p> |
| <h3 id="iceberg_data"><code>iceberg_data</code><a class="headerlink" href="#iceberg_data" title="Permanent link">¶</a></h3> |
| <p>This library handles data-plane processing, including delete filtering, data |
| writers, and scan task readers. Concrete Avro and Parquet readers and writers |
| are supplied by the <code>iceberg_bundle</code> library.</p> |
| <h3 id="iceberg_bundle"><code>iceberg_bundle</code><a class="headerlink" href="#iceberg_bundle" title="Permanent link">¶</a></h3> |
| <p>This library combines <code>iceberg_data</code> with the Arrow C++, Avro, Parquet, and |
| Arrow filesystem integrations. It gives applications one link-time dependency. |
| Please note that Meson build currently does not have this yet.</p> |
| <h3 id="iceberg_rest-iceberg_hive-iceberg_sql_catalog"><code>iceberg_rest</code>, <code>iceberg_hive</code>, <code>iceberg_sql_catalog</code><a class="headerlink" href="#iceberg_rest-iceberg_hive-iceberg_sql_catalog" title="Permanent link">¶</a></h3> |
| <p>These optional catalog libraries cover REST, Hive Metastore, and SQL databases. |
| Each depends on <code>iceberg</code> and its own client libraries, not on <code>iceberg_data</code> or |
| <code>iceberg_bundle</code>.</p> |
| <h2 id="source-and-header-ownership">Source and header ownership<a class="headerlink" href="#source-and-header-ownership" title="Permanent link">¶</a></h2> |
| <p>Production files are kept in the directory for the library that builds them:</p> |
| <ul> |
| <li>Core files stay in the <code>iceberg</code> root or core subdirectories such as |
| <code>deletes/</code>, <code>puffin/</code>, <code>manifest/</code>, and <code>update/</code>.</li> |
| <li>Files under <code>data/</code> are built into <code>iceberg_data</code>.</li> |
| <li>Files under <code>arrow/</code>, <code>avro/</code>, and <code>parquet/</code> are built into |
| <code>iceberg_bundle</code>.</li> |
| <li>Optional catalog implementations stay under <code>catalog/rest/</code>, <code>catalog/hive/</code>, |
| and <code>catalog/sql/</code> and are built into their corresponding catalog libraries.</li> |
| </ul> |
| <p>The Arrow C Data files in the <code>iceberg</code> root are core infrastructure and are |
| separate from the Arrow C++ integration under <code>arrow/</code>.</p> |
| <p>Public headers are installed with their existing <code>iceberg/...</code> include paths. |
| Headers whose names contain <code>internal</code> are not installed.</p> |
| <h2 id="runtime-registration">Runtime registration<a class="headerlink" href="#runtime-registration" title="Permanent link">¶</a></h2> |
| <p>The core library defines registries for optional file readers, writers, and |
| filesystem implementations. Integrations register their implementations as |
| follows:</p> |
| <ul> |
| <li>Arrow local and S3 <code>FileIO</code> implementations are registered when the Arrow |
| integration is loaded. <code>iceberg::arrow::RegisterAll()</code> additionally registers |
| Arrow-based batch projection.</li> |
| <li>Avro readers, writers, and logical types are registered by |
| <code>iceberg::avro::RegisterAll()</code>.</li> |
| <li>Parquet readers and writers are registered by |
| <code>iceberg::parquet::RegisterAll()</code>.</li> |
| </ul> |
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