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| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_struct.html">pyarrow.types.is_struct</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_union.html">pyarrow.types.is_union</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_nested.html">pyarrow.types.is_nested</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_run_end_encoded.html">pyarrow.types.is_run_end_encoded</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_temporal.html">pyarrow.types.is_temporal</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_timestamp.html">pyarrow.types.is_timestamp</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_date.html">pyarrow.types.is_date</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_date32.html">pyarrow.types.is_date32</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_duration.html">pyarrow.types.is_duration</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_interval.html">pyarrow.types.is_interval</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_null.html">pyarrow.types.is_null</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_binary.html">pyarrow.types.is_binary</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_unicode.html">pyarrow.types.is_unicode</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_string.html">pyarrow.types.is_string</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_large_binary.html">pyarrow.types.is_large_binary</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_large_unicode.html">pyarrow.types.is_large_unicode</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_large_string.html">pyarrow.types.is_large_string</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_binary_view.html">pyarrow.types.is_binary_view</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_string_view.html">pyarrow.types.is_string_view</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_fixed_size_binary.html">pyarrow.types.is_fixed_size_binary</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_map.html">pyarrow.types.is_map</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_dictionary.html">pyarrow.types.is_dictionary</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.is_primitive.html">pyarrow.types.is_primitive</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.types.TypesEnum.html">pyarrow.types.TypesEnum</a></li> |
| </ul> |
| </details></li> |
| <li class="toctree-l3 has-children"><a class="reference internal" href="../../python/api/arrays.html">Arrays and Scalars</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.array.html">pyarrow.array</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Array.html">pyarrow.Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BooleanArray.html">pyarrow.BooleanArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FloatingPointArray.html">pyarrow.FloatingPointArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.IntegerArray.html">pyarrow.IntegerArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int8Array.html">pyarrow.Int8Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int16Array.html">pyarrow.Int16Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int32Array.html">pyarrow.Int32Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int64Array.html">pyarrow.Int64Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.NullArray.html">pyarrow.NullArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.NumericArray.html">pyarrow.NumericArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt8Array.html">pyarrow.UInt8Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt16Array.html">pyarrow.UInt16Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt32Array.html">pyarrow.UInt32Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt64Array.html">pyarrow.UInt64Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.HalfFloatArray.html">pyarrow.HalfFloatArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FloatArray.html">pyarrow.FloatArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DoubleArray.html">pyarrow.DoubleArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BinaryArray.html">pyarrow.BinaryArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StringArray.html">pyarrow.StringArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedSizeBinaryArray.html">pyarrow.FixedSizeBinaryArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeBinaryArray.html">pyarrow.LargeBinaryArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeStringArray.html">pyarrow.LargeStringArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BinaryViewArray.html">pyarrow.BinaryViewArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StringViewArray.html">pyarrow.StringViewArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Time32Array.html">pyarrow.Time32Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Time64Array.html">pyarrow.Time64Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Date32Array.html">pyarrow.Date32Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Date64Array.html">pyarrow.Date64Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.TimestampArray.html">pyarrow.TimestampArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DurationArray.html">pyarrow.DurationArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.MonthDayNanoIntervalArray.html">pyarrow.MonthDayNanoIntervalArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Decimal32Array.html">pyarrow.Decimal32Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Decimal64Array.html">pyarrow.Decimal64Array</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DictionaryArray.html">pyarrow.DictionaryArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ListArray.html">pyarrow.ListArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedSizeListArray.html">pyarrow.FixedSizeListArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeListArray.html">pyarrow.LargeListArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ListViewArray.html">pyarrow.ListViewArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeListViewArray.html">pyarrow.LargeListViewArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.MapArray.html">pyarrow.MapArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.RunEndEncodedArray.html">pyarrow.RunEndEncodedArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StructArray.html">pyarrow.StructArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UnionArray.html">pyarrow.UnionArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ExtensionArray.html">pyarrow.ExtensionArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedShapeTensorArray.html">pyarrow.FixedShapeTensorArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.OpaqueArray.html">pyarrow.OpaqueArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.JsonArray.html">pyarrow.JsonArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UuidArray.html">pyarrow.UuidArray</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Bool8Array.html">pyarrow.Bool8Array</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.scalar.html">pyarrow.scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.NA.html">pyarrow.NA</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Scalar.html">pyarrow.Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BooleanScalar.html">pyarrow.BooleanScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int8Scalar.html">pyarrow.Int8Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int16Scalar.html">pyarrow.Int16Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int32Scalar.html">pyarrow.Int32Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Int64Scalar.html">pyarrow.Int64Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.NullScalar.html">pyarrow.NullScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt8Scalar.html">pyarrow.UInt8Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt16Scalar.html">pyarrow.UInt16Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt32Scalar.html">pyarrow.UInt32Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UInt64Scalar.html">pyarrow.UInt64Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.HalfFloatScalar.html">pyarrow.HalfFloatScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FloatScalar.html">pyarrow.FloatScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DoubleScalar.html">pyarrow.DoubleScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BinaryScalar.html">pyarrow.BinaryScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StringScalar.html">pyarrow.StringScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedSizeBinaryScalar.html">pyarrow.FixedSizeBinaryScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeBinaryScalar.html">pyarrow.LargeBinaryScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeStringScalar.html">pyarrow.LargeStringScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.BinaryViewScalar.html">pyarrow.BinaryViewScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StringViewScalar.html">pyarrow.StringViewScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Time32Scalar.html">pyarrow.Time32Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Time64Scalar.html">pyarrow.Time64Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Date32Scalar.html">pyarrow.Date32Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Date64Scalar.html">pyarrow.Date64Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.TimestampScalar.html">pyarrow.TimestampScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DurationScalar.html">pyarrow.DurationScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.MonthDayNanoIntervalScalar.html">pyarrow.MonthDayNanoIntervalScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Decimal128Scalar.html">pyarrow.Decimal128Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Decimal256Scalar.html">pyarrow.Decimal256Scalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.DictionaryScalar.html">pyarrow.DictionaryScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.RunEndEncodedScalar.html">pyarrow.RunEndEncodedScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ListScalar.html">pyarrow.ListScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedSizeListScalar.html">pyarrow.FixedSizeListScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeListScalar.html">pyarrow.LargeListScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ListViewScalar.html">pyarrow.ListViewScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.LargeListViewScalar.html">pyarrow.LargeListViewScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.MapScalar.html">pyarrow.MapScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.StructScalar.html">pyarrow.StructScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UnionScalar.html">pyarrow.UnionScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ExtensionScalar.html">pyarrow.ExtensionScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.FixedShapeTensorScalar.html">pyarrow.FixedShapeTensorScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.OpaqueScalar.html">pyarrow.OpaqueScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.JsonScalar.html">pyarrow.JsonScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.UuidScalar.html">pyarrow.UuidScalar</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Bool8Scalar.html">pyarrow.Bool8Scalar</a></li> |
| </ul> |
| </details></li> |
| <li class="toctree-l3 has-children"><a class="reference internal" href="../../python/api/memory.html">Buffers and Memory</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.allocate_buffer.html">pyarrow.allocate_buffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.py_buffer.html">pyarrow.py_buffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.foreign_buffer.html">pyarrow.foreign_buffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Buffer.html">pyarrow.Buffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.ResizableBuffer.html">pyarrow.ResizableBuffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.Codec.html">pyarrow.Codec</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.compress.html">pyarrow.compress</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.decompress.html">pyarrow.decompress</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.MemoryPool.html">pyarrow.MemoryPool</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../python/generated/pyarrow.default_memory_pool.html">pyarrow.default_memory_pool</a></li> |
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| <section id="acero-overview"> |
| <h1>Acero Overview<a class="headerlink" href="#acero-overview" title="Link to this heading">#</a></h1> |
| <p>This page gives an overview of the basic Acero concepts and helps distinguish Acero |
| from other modules in the Arrow code base. It’s intended for users, developers, |
| potential contributors, and for those that would like to extend Acero, either for |
| research or for business use. This page assumes the reader is already familiar with |
| core Arrow concepts. This page does not expect any existing knowledge in relational |
| algebra.</p> |
| <section id="what-is-acero"> |
| <h2>What is Acero?<a class="headerlink" href="#what-is-acero" title="Link to this heading">#</a></h2> |
| <p>Acero is a C++ library that can be used to analyze large (potentially infinite) streams |
| of data. Acero allows computation to be expressed as an “execution plan” (<a class="reference internal" href="../api/acero.html#_CPPv4N5arrow5acero8ExecPlanE" title="arrow::acero::ExecPlan"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code></a>). |
| An execution plan takes in zero or more streams of input data and emits a single |
| stream of output data. The plan describes how the data will be transformed as it |
| passes through. For example, a plan might:</p> |
| <ul class="simple"> |
| <li><p>Merge two streams of data using a common column</p></li> |
| <li><p>Create additional columns by evaluating expressions against the existing columns</p></li> |
| <li><p>Consume a stream of data by writing it to disk in a partitioned layout</p></li> |
| </ul> |
| <img alt="A sample execution plan that joins three streams of data and writes to disk" class="align-center" src="../../_images/simple_graph.svg" /> |
| <section id="acero-is-not"> |
| <h3>Acero is not…<a class="headerlink" href="#acero-is-not" title="Link to this heading">#</a></h3> |
| <section id="a-library-for-data-scientists"> |
| <h4>A Library for Data Scientists<a class="headerlink" href="#a-library-for-data-scientists" title="Link to this heading">#</a></h4> |
| <p>Acero is not intended to be used directly by data scientists. It is expected that |
| end users will typically be using some kind of frontend. For example, Pandas, Ibis, |
| or SQL. The API for Acero is focused around capabilities and available algorithms. |
| However, such users may be interested in knowing more about how Acero works so that |
| they can better understand how the backend processing for their libraries operates.</p> |
| </section> |
| <section id="a-database"> |
| <h4>A Database<a class="headerlink" href="#a-database" title="Link to this heading">#</a></h4> |
| <p>A database (or DBMS) is typically a much more expansive application and often packaged |
| as a standalone service. Acero could be a component in a database (most databases have |
| some kind of execution engine) or could be a component in some other data processing |
| application that hardly resembles a database. Acero does not concern itself with |
| user management, external communication, isolation, durability, or consistency. In |
| addition, Acero is focused primarily on the read path, and the write utilities lack |
| any sort of transaction support.</p> |
| </section> |
| <section id="an-optimizer"> |
| <h4>An Optimizer<a class="headerlink" href="#an-optimizer" title="Link to this heading">#</a></h4> |
| <p>Acero does not have an SQL parser. It does not have a query planner. It does not have |
| any sort of optimizer. Acero expects to be given very detailed and low-level instructions |
| on how to manipulate data and then it will perform that manipulation exactly as described.</p> |
| <p>Creating the best execution plan is very hard. Small details can have a big impact on |
| performance. We do think an optimizer is important but we believe it should be |
| implemented independent of acero, hopefully in a composable way through standards such |
| as Substrait so that any backend could leverage it.</p> |
| </section> |
| <section id="distributed"> |
| <h4>Distributed<a class="headerlink" href="#distributed" title="Link to this heading">#</a></h4> |
| <p>Acero does not provide distributed execution. However, Acero aims to be usable by a distributed |
| query execution engine. In other words, Acero will not configure and coordinate workers but |
| it does expect to be used as a worker. Sometimes, the distinction is a bit fuzzy. For example, |
| an Acero source may be a smart storage device that is capable of performing filtering or other |
| advanced analytics. One might consider this a distributed plan. The key distinction is Acero |
| does not have the capability of transforming a logical plan into a distributed execution plan. |
| That step will need to be done elsewhere.</p> |
| </section> |
| </section> |
| <section id="acero-vs"> |
| <h3>Acero vs…<a class="headerlink" href="#acero-vs" title="Link to this heading">#</a></h3> |
| <section id="arrow-compute"> |
| <h4>Arrow Compute<a class="headerlink" href="#arrow-compute" title="Link to this heading">#</a></h4> |
| <p>This is described in more detail in <a class="reference internal" href="#cpp-vs-acero"><span class="std std-ref">Relation to Arrow C++</span></a> but the key difference |
| is that Acero handles streams of data and Arrow Compute handles situations where all the |
| data is in memory.</p> |
| </section> |
| <section id="arrow-datasets"> |
| <h4>Arrow Datasets<a class="headerlink" href="#arrow-datasets" title="Link to this heading">#</a></h4> |
| <p>The Arrow datasets library provides some basic routines for discovering, scanning, and |
| writing collections of files. The datasets module depends on Acero. Both scanning and |
| writing datasets uses Acero. The scan node and the write node are part of the datasets |
| module. This helps to keep the complexity of file formats and filesystems out of the core |
| Acero logic.</p> |
| </section> |
| <section id="substrait"> |
| <h4>Substrait<a class="headerlink" href="#substrait" title="Link to this heading">#</a></h4> |
| <p>Substrait is a project establishing standards for query plans. Acero executes query plans |
| and generates data. This makes Acero a Substrait consumer. There are more details on the |
| Substrait capabilities in <a class="reference internal" href="substrait.html#acero-substrait"><span class="std std-ref">Using Acero with Substrait</span></a>.</p> |
| </section> |
| <section id="datafusion-duckdb-velox-etc"> |
| <h4>Datafusion / DuckDb / Velox / Etc.<a class="headerlink" href="#datafusion-duckdb-velox-etc" title="Link to this heading">#</a></h4> |
| <p>There are many columnar data engines emerging. We view this as a good thing and encourage |
| projects like Substrait to help allow switching between engines as needed. We generally |
| discourage comparative benchmarks as they are almost inevitably going to be workload-driven |
| and rarely manage to capture an apples-vs-apples comparison. Discussions of the pros and |
| cons of each is beyond the scope of this guide.</p> |
| </section> |
| </section> |
| </section> |
| <section id="relation-to-arrow-c"> |
| <span id="cpp-vs-acero"></span><h2>Relation to Arrow C++<a class="headerlink" href="#relation-to-arrow-c" title="Link to this heading">#</a></h2> |
| <p>The Acero module is part of the Arrow C++ implementation. It is built as a separate |
| module but it depends on core Arrow modules and does not stand alone. Acero uses |
| and extends the capabilities from the core Arrow module and the Arrow compute kernels.</p> |
| <img alt="A diagram of layers with core on the left, compute in the middle, and acero on the right" src="../../_images/layers.svg" /> |
| <p>The core Arrow library provides containers for buffers and arrays that are laid out according |
| to the Arrow columnar format. With few exceptions the core Arrow library does not examine |
| or modify the contents of buffers. For example, converting a string array from lowercase |
| strings to uppercase strings would not be a part of the core Arrow library because that would |
| require examining the contents of the array.</p> |
| <p>The compute module expands on the core library and provides functions which analyze and |
| transform data. The compute module’s capabilities are all exposed via a function registry. |
| An Arrow “function” accepts zero or more arrays, batches, or tables, and produces an array, |
| batch, or table. In addition, function calls can be combined, along with field references |
| and literals, to form an expression (a tree of function calls) which the compute module can |
| evaluate. For example, calculating <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">+</span> <span class="pre">(y</span> <span class="pre">*</span> <span class="pre">3)</span></code> given a table with columns <code class="docutils literal notranslate"><span class="pre">x</span></code> and <code class="docutils literal notranslate"><span class="pre">y</span></code>.</p> |
| <img alt="A sample expression tree" class="align-center" src="../../_images/expression_ast.svg" /> |
| <p>Acero expands on these capabilities by adding compute operations for streams of data. For |
| example, a project node can apply a compute expression on a stream of batches. This will |
| create a new stream of batches with the result of the expression added as a new column. These |
| nodes can be combined into a graph to form a more complex execution plan. This is very similar |
| to the way functions are combined into a tree to form a complex expression.</p> |
| <img alt="A simple plan that uses compute expressions" src="../../_images/simple_plan.svg" /> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Acero does not use the <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> or <a class="reference internal" href="../api/array.html#_CPPv4N5arrow12ChunkedArrayE" title="arrow::ChunkedArray"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::ChunkedArray</span></code></a> containers |
| from the core Arrow library. This is because Acero operates on streams of batches and |
| so there is no need for a multi-batch container of data. This helps to reduce the |
| complexity of Acero and avoids tricky situations that can arise from tables whose |
| columns have different chunk sizes. Acero will often use <a class="reference internal" href="../api/compute.html#_CPPv4N5arrow5DatumE" title="arrow::Datum"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Datum</span></code></a> |
| which is a variant from the core module that can hold many different types. Within |
| Acero, a datum will always hold either an <a class="reference internal" href="../api/array.html#_CPPv4N5arrow5ArrayE" title="arrow::Array"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Array</span></code></a> or a <a class="reference internal" href="../api/scalar.html#_CPPv4N5arrow6ScalarE" title="arrow::Scalar"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Scalar</span></code></a>.</p> |
| </div> |
| </section> |
| <section id="core-concepts"> |
| <h2>Core Concepts<a class="headerlink" href="#core-concepts" title="Link to this heading">#</a></h2> |
| <section id="execnode"> |
| <h3>ExecNode<a class="headerlink" href="#execnode" title="Link to this heading">#</a></h3> |
| <p>The most basic concept in Acero is the ExecNode. An ExecNode has zero or more inputs and |
| zero or one outputs. If an ExecNode has zero inputs we call it a source and if an ExecNode |
| does not have an output then we call it a sink. There are many different kinds of nodes and |
| each one transforms its inputs in different ways. For example:</p> |
| <ul class="simple"> |
| <li><p>A scan node is a source node that reads data from files</p></li> |
| <li><p>An aggregate node accumulates batches of data to compute summary statistics</p></li> |
| <li><p>A filter node removes rows from the data according to a filter expression</p></li> |
| <li><p>A table sink node accumulates data into a table</p></li> |
| </ul> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>A full list of the available compute modules is included in the <a class="reference internal" href="user_guide.html#execnode-list"><span class="std std-ref">user’s guide</span></a></p> |
| </div> |
| </section> |
| <section id="execbatch"> |
| <span id="exec-batch"></span><h3>ExecBatch<a class="headerlink" href="#execbatch" title="Link to this heading">#</a></h3> |
| <p>Batches of data are represented by the ExecBatch class. An ExecBatch is a 2D structure that |
| is very similar to a RecordBatch. It can have zero or more columns and all of the columns |
| must have the same length. There are a few key differences from ExecBatch:</p> |
| <figure class="align-default" id="id1"> |
| <img alt="../../_images/rb_vs_eb.svg" src="../../_images/rb_vs_eb.svg" /> |
| <figcaption> |
| <p><span class="caption-text">Both the record batch and the exec batch have strong ownership of the arrays & buffers</span><a class="headerlink" href="#id1" title="Link to this image">#</a></p> |
| </figcaption> |
| </figure> |
| <ul class="simple"> |
| <li><p>An <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> does not have a schema. This is because an <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> is assumed to be |
| part of a stream of batches and the stream is assumed to have a consistent schema. So |
| the schema for an <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> is typically stored in the ExecNode.</p></li> |
| <li><p>Columns in an <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> are either an <code class="docutils literal notranslate"><span class="pre">Array</span></code> or a <code class="docutils literal notranslate"><span class="pre">Scalar</span></code>. When a column is a <code class="docutils literal notranslate"><span class="pre">Scalar</span></code> |
| this means that the column has a single value for every row in the batch. An <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> |
| also has a length property which describes how many rows are in a batch. So another way to |
| view a <code class="docutils literal notranslate"><span class="pre">Scalar</span></code> is a constant array with <code class="docutils literal notranslate"><span class="pre">length</span></code> elements.</p></li> |
| <li><p>An <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> contains additional information used by the exec plan. For example, an |
| <code class="docutils literal notranslate"><span class="pre">index</span></code> can be used to describe a batch’s position in an ordered stream. We expect |
| that <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> will also evolve to contain additional fields such as a selection vector.</p></li> |
| </ul> |
| <figure class="align-default" id="id2"> |
| <img alt="../../_images/scalar_vs_array.svg" src="../../_images/scalar_vs_array.svg" /> |
| <figcaption> |
| <p><span class="caption-text">There are four different ways to represent the given batch of data using different combinations |
| of arrays and scalars. All four exec batches should be considered semantically equivalent.</span><a class="headerlink" href="#id2" title="Link to this image">#</a></p> |
| </figcaption> |
| </figure> |
| <p>Converting from a record batch to an exec batch is always zero copy. Both RecordBatch and ExecBatch |
| refer to the exact same underlying arrays. Converting from an exec batch to a record batch is |
| only zero copy if there are no scalars in the exec batch.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Both Acero and the compute module have “lightweight” versions of batches and arrays. |
| In the compute module these are called <code class="docutils literal notranslate"><span class="pre">BatchSpan</span></code>, <code class="docutils literal notranslate"><span class="pre">ArraySpan</span></code>, and <code class="docutils literal notranslate"><span class="pre">BufferSpan</span></code>. In |
| Acero the concept is called <code class="docutils literal notranslate"><span class="pre">KeyColumnArray</span></code>. These types were developed concurrently |
| and serve the same purpose. They aim to provide an array container that can be completely |
| stack allocated (provided the data type is non-nested) in order to avoid heap allocation |
| overhead. Ideally these two concepts will be merged someday.</p> |
| </div> |
| </section> |
| <section id="execplan"> |
| <h3>ExecPlan<a class="headerlink" href="#execplan" title="Link to this heading">#</a></h3> |
| <p>An ExecPlan represents a graph of ExecNode objects. A valid ExecPlan must always have at |
| least one source node but it does not technically need to have a sink node. The ExecPlan contains |
| resources shared by all of the nodes and has utility functions to control starting and stopping |
| execution of the nodes. Both ExecPlan and ExecNode are tied to the lifecycle of a single execution. |
| They have state and are not expected to be restartable.</p> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>The structures within Acero, including <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code>, are still experimental. The <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> |
| class should not be used outside of Acero. Instead, an <code class="docutils literal notranslate"><span class="pre">ExecBatch</span></code> should be converted to |
| a more standard structure such as a <code class="docutils literal notranslate"><span class="pre">RecordBatch</span></code>.</p> |
| <p>Similarly, an ExecPlan is an internal concept. Users creating plans should be using Declaration |
| objects. APIs for consuming and executing plans should abstract away the details of the underlying |
| plan and not expose the object itself.</p> |
| </div> |
| </section> |
| <section id="declaration"> |
| <h3>Declaration<a class="headerlink" href="#declaration" title="Link to this heading">#</a></h3> |
| <p>A Declaration is a blueprint for an ExecNode. Declarations can be combined into a graph to |
| form the blueprint for an ExecPlan. A Declaration describes the computation that needs to be |
| done but is not actually responsible for carrying out the computation. In this way, a Declaration is |
| analogous to an expression. It is expected that Declarations will need to be converted to and from |
| various query representations (e.g. Substrait). The Declaration objects are the public API, combined |
| with the DeclarationToXyz methods, are the current public API for Acero.</p> |
| <figure class="align-default" id="id3"> |
| <img alt="../../_images/decl_vs_ep.svg" src="../../_images/decl_vs_ep.svg" /> |
| <figcaption> |
| <p><span class="caption-text">A declaration is a blueprint that is used to instantiate exec plan instances</span><a class="headerlink" href="#id3" title="Link to this image">#</a></p> |
| </figcaption> |
| </figure> |
| </section> |
| </section> |
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