api/org/apache/datafusion/SessionContext.html - datafusion-java - Git at Google

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 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.datafusion</a></div>
 <h1 title="Class SessionContext" class="title">Class SessionContext</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
 <div class="inheritance">org.apache.datafusion.SessionContext</div>
 </div>
 <section class="class-description" id="class-description">
 <dl class="notes">
 <dt>All Implemented Interfaces:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html" title="class or interface in java.lang" class="external-link">AutoCloseable</a></code></dd>
 </dl>
 <hr>
 <div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">SessionContext</span>
 <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
 implements <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html" title="class or interface in java.lang" class="external-link">AutoCloseable</a></span></div>
 <div class="block">A DataFusion session context.

  <p>Instances are <strong>not thread-safe</strong>. Concurrent calls to any of <a href="#sql(java.lang.String)"><code>sql(java.lang.String)</code></a>,
  <a href="#registerParquet(java.lang.String,java.lang.String)"><code>registerParquet(java.lang.String, java.lang.String)</code></a>, or <a href="#close()"><code>close()</code></a> from different threads can produce a use-after-free
  on the native side. Callers must externally synchronize, or confine each context to a single
  thread.</div>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
 <li>
 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">SessionContext</a>()</code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 </div>
 </section>
 </li>
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
 <div class="summary-table three-column-summary">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="SessionContextBuilder.html" title="class in org.apache.datafusion">SessionContextBuilder</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#builder()" class="member-name-link">builder</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Start configuring a <a href="SessionContext.html" title="class in org.apache.datafusion"><code>SessionContext</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#close()" class="member-name-link">close</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#deregisterTable(java.lang.String)" class="member-name-link">deregisterTable</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Removes the table with the given name from this session.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#fromProto(byte%5B%5D)" class="member-name-link">fromProto</a><wbr>(byte[]&nbsp;planBytes)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Decode a DataFusion-Proto <code>LogicalPlanNode</code> and return a lazy <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#fromSubstrait(byte%5B%5D)" class="member-name-link">fromSubstrait</a><wbr>(byte[]&nbsp;planBytes)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Decode a <a href="https://substrait.io/">Substrait</a> <code>Plan</code> message and return a lazy
  <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getOption(java.lang.String)" class="member-name-link">getOption</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read the current value of a <code>datafusion.*</code> config key.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="MemoryUsage.html" title="class in org.apache.datafusion">MemoryUsage</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#memoryUsage()" class="member-name-link">memoryUsage</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Snapshot the session's memory pool: bytes currently held and the peak observed since this
  session was created.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readArrow(java.lang.String)" class="member-name-link">readArrow</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read an Arrow IPC file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readArrow(java.lang.String,org.apache.datafusion.ArrowReadOptions)" class="member-name-link">readArrow</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion">ArrowReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read an Arrow IPC file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="ArrowReadOptions.html" title="class in org.apache.datafusion"><code>ArrowReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readAvro(java.lang.String)" class="member-name-link">readAvro</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read an Avro file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readAvro(java.lang.String,org.apache.datafusion.AvroReadOptions)" class="member-name-link">readAvro</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="AvroReadOptions.html" title="class in org.apache.datafusion">AvroReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read an Avro file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="AvroReadOptions.html" title="class in org.apache.datafusion"><code>AvroReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readCsv(java.lang.String)" class="member-name-link">readCsv</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a CSV file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readCsv(java.lang.String,org.apache.datafusion.CsvReadOptions)" class="member-name-link">readCsv</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="CsvReadOptions.html" title="class in org.apache.datafusion">CsvReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a CSV file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="CsvReadOptions.html" title="class in org.apache.datafusion"><code>CsvReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readJson(java.lang.String)" class="member-name-link">readJson</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a newline-delimited JSON file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readJson(java.lang.String,org.apache.datafusion.NdJsonReadOptions)" class="member-name-link">readJson</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion">NdJsonReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a newline-delimited JSON file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion"><code>NdJsonReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readParquet(java.lang.String)" class="member-name-link">readParquet</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a parquet file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#readParquet(java.lang.String,org.apache.datafusion.ParquetReadOptions)" class="member-name-link">readParquet</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ParquetReadOptions.html" title="class in org.apache.datafusion">ParquetReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Read a parquet file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="ParquetReadOptions.html" title="class in org.apache.datafusion"><code>ParquetReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerArrow(java.lang.String,java.lang.String)" class="member-name-link">registerArrow</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register an Arrow IPC file (or directory of Arrow IPC files) as a table.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerArrow(java.lang.String,java.lang.String,org.apache.datafusion.ArrowReadOptions)" class="member-name-link">registerArrow</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion">ArrowReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register an Arrow IPC file (or directory of Arrow IPC files) as a table with the supplied
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion"><code>ArrowReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerAvro(java.lang.String,java.lang.String)" class="member-name-link">registerAvro</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register an Avro file (or directory of Avro files) as a table.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerAvro(java.lang.String,java.lang.String,org.apache.datafusion.AvroReadOptions)" class="member-name-link">registerAvro</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="AvroReadOptions.html" title="class in org.apache.datafusion">AvroReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register an Avro file (or directory of Avro files) as a table with the supplied <a href="AvroReadOptions.html" title="class in org.apache.datafusion"><code>AvroReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerCsv(java.lang.String,java.lang.String)" class="member-name-link">registerCsv</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerCsv(java.lang.String,java.lang.String,org.apache.datafusion.CsvReadOptions)" class="member-name-link">registerCsv</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="CsvReadOptions.html" title="class in org.apache.datafusion">CsvReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register a CSV file (or directory of CSV files) as a table with the supplied <a href="CsvReadOptions.html" title="class in org.apache.datafusion"><code>CsvReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerJson(java.lang.String,java.lang.String)" class="member-name-link">registerJson</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerJson(java.lang.String,java.lang.String,org.apache.datafusion.NdJsonReadOptions)" class="member-name-link">registerJson</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion">NdJsonReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register a newline-delimited JSON file (or directory of NDJSON files) as a table with the
  supplied <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion"><code>NdJsonReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerParquet(java.lang.String,java.lang.String)" class="member-name-link">registerParquet</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerParquet(java.lang.String,java.lang.String,org.apache.datafusion.ParquetReadOptions)" class="member-name-link">registerParquet</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ParquetReadOptions.html" title="class in org.apache.datafusion">ParquetReadOptions</a>&nbsp;options)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register a parquet file as a table with the supplied <a href="ParquetReadOptions.html" title="class in org.apache.datafusion"><code>ParquetReadOptions</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerTable(java.lang.String,org.apache.datafusion.TableProvider)" class="member-name-link">registerTable</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="TableProvider.html" title="interface in org.apache.datafusion">TableProvider</a>&nbsp;provider)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register a Java-implemented <a href="TableProvider.html" title="interface in org.apache.datafusion"><code>TableProvider</code></a> under <code>name</code>.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#registerUdf(org.apache.datafusion.ScalarUdf)" class="member-name-link">registerUdf</a><wbr>(<a href="ScalarUdf.html" title="class in org.apache.datafusion">ScalarUdf</a>&nbsp;udf)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Register a Java-implemented scalar UDF.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="RuntimeStats.html" title="class in org.apache.datafusion">RuntimeStats</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#runtimeStats()" class="member-name-link">runtimeStats</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Snapshot operational counters from the underlying Tokio runtime: worker count, busy time, queue
  depth, etc.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#sql(java.lang.String)" class="member-name-link">sql</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;query)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Parse and plan <code>query</code>, returning a lazy <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#tableExists(java.lang.String)" class="member-name-link">tableExists</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns <code>true</code> if a table with the given name is registered in this session.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>org.apache.arrow.vector.types.pojo.Schema</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#tableSchema(java.lang.String)" class="member-name-link">tableSchema</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;tableName)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Return the Arrow <code>Schema</code> of a registered table.</div>
 </div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;()">
 <h3>SessionContext</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">SessionContext</span>()</div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="builder()">
 <h3>builder</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="SessionContextBuilder.html" title="class in org.apache.datafusion">SessionContextBuilder</a></span>&nbsp;<span class="element-name">builder</span>()</div>
 <div class="block">Start configuring a <a href="SessionContext.html" title="class in org.apache.datafusion"><code>SessionContext</code></a>.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="sql(java.lang.String)">
 <h3>sql</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">sql</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;query)</span></div>
 <div class="block">Parse and plan <code>query</code>, returning a lazy <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>. The query is not executed
  until <a href="DataFrame.html#collect(org.apache.arrow.memory.BufferAllocator)"><code>DataFrame.collect(org.apache.arrow.memory.BufferAllocator)</code></a> is called.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="fromProto(byte[])">
 <h3>fromProto</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">fromProto</span><wbr><span class="parameters">(byte[]&nbsp;planBytes)</span></div>
 <div class="block">Decode a DataFusion-Proto <code>LogicalPlanNode</code> and return a lazy <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>. The plan
  is not executed until <a href="DataFrame.html#collect(org.apache.arrow.memory.BufferAllocator)"><code>DataFrame.collect(org.apache.arrow.memory.BufferAllocator)</code></a> is called.

  <p>The bytes must be a serialized <code>datafusion.LogicalPlanNode</code> (see <code>
  org.apache.datafusion.protobuf.LogicalPlanNode</code>).</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the bytes are not a valid <code>LogicalPlanNode</code> or if logical
      planning fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="fromSubstrait(byte[])">
 <h3>fromSubstrait</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">fromSubstrait</span><wbr><span class="parameters">(byte[]&nbsp;planBytes)</span></div>
 <div class="block">Decode a <a href="https://substrait.io/">Substrait</a> <code>Plan</code> message and return a lazy
  <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a>. The plan is not executed until <a href="DataFrame.html#collect(org.apache.arrow.memory.BufferAllocator)"><code>DataFrame.collect(org.apache.arrow.memory.BufferAllocator)</code></a> or <a href="DataFrame.html#executeStream(org.apache.arrow.memory.BufferAllocator)"><code>DataFrame.executeStream(org.apache.arrow.memory.BufferAllocator)</code></a> is called.

  <p><code>planBytes</code> must be a serialised <code>substrait.proto.Plan</code>. The plan is translated
  to a DataFusion <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> against this context's catalog: any tables referenced by the
  plan must already be registered (see <a href="#registerCsv(java.lang.String,java.lang.String)"><code>registerCsv(java.lang.String, java.lang.String)</code></a>, <a href="#registerParquet(java.lang.String,java.lang.String)"><code>registerParquet(java.lang.String, java.lang.String)</code></a>, etc.).

  <p>This entry point lets Java callers compile plans elsewhere — Calcite via <a href="https://github.com/substrait-io/substrait-java">Isthmus</a>, custom planners, or any
  other Substrait-emitting tool — and hand them to DataFusion without round-tripping through SQL.

  <p>Substrait support is gated behind the <code>substrait</code> Cargo feature on the native crate
  and is <strong>off by default</strong>. Rebuild the native crate with <code>cargo build -p
  datafusion-jni --features substrait</code> (or <code>... --features substrait,protoc</code> for hermetic
  builds that vendor <code>protoc</code> via <code>cmake</code>) to enable it. If invoked against a native
  binary built without the feature, this method throws <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link"><code>RuntimeException</code></a> pointing at the
  flag.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>planBytes</code> is <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the bytes are not a valid <code>substrait.proto.Plan</code>, if
      Substrait→DataFusion translation fails (e.g. the plan references an unregistered table), or
      if the native crate was built without the <code>substrait</code> feature.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="memoryUsage()">
 <h3>memoryUsage</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="MemoryUsage.html" title="class in org.apache.datafusion">MemoryUsage</a></span>&nbsp;<span class="element-name">memoryUsage</span>()</div>
 <div class="block">Snapshot the session's memory pool: bytes currently held and the peak observed since this
  session was created. Thread-safe; can be polled while queries run.

  <p>For multi-tenant attribution, place each tenant in its own <a href="SessionContext.html" title="class in org.apache.datafusion"><code>SessionContext</code></a>. Within a
  single session, the snapshot is the sum across all in-flight queries -- there is no
  per-DataFrame breakdown today.

  <p>The session's <code>MemoryPool</code> is wrapped transparently with a tracking adapter at
  construction time; the wrapper layers on top of whatever pool <a href="SessionContextBuilder.html#memoryLimit(long,double)"><code>SessionContextBuilder.memoryLimit(long, double)</code></a> produced (or DataFusion's default unbounded
  pool) and does not change pool semantics (limits, eviction, spilling).

  <p><b>What this counts:</b> bytes reserved against the <code>MemoryPool</code> -- operator state for
  sorts, hash joins, aggregates, repartition buffers, and anything else that uses DataFusion's
  <code>MemoryReservation</code> machinery during execution.

  <p><b>What this does <i>not</i> count:</b> memory held outside the pool, including record-batch
  buffers materialised by <a href="DataFrame.html#cache()"><code>DataFrame.cache()</code></a> (stored in an in-memory <code>MemTable</code> as
  plain <code>Vec&lt;RecordBatch&gt;</code> with no reservation), record-batch buffers that have crossed the
  FFI boundary into Arrow's Java allocator, and JVM-side allocations. Operator-level reservations
  are released as the plan unwinds, so a query that runs to completion typically returns <code>
  currentBytes</code> to ~0 even if the result set is large.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the native side has not registered a tracker for this handle
      (should not happen in practice -- tracker registration is done by the constructor).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="runtimeStats()">
 <h3>runtimeStats</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="RuntimeStats.html" title="class in org.apache.datafusion">RuntimeStats</a></span>&nbsp;<span class="element-name">runtimeStats</span>()</div>
 <div class="block">Snapshot operational counters from the underlying Tokio runtime: worker count, busy time, queue
  depth, etc. Thread-safe; can be polled while queries run.

  <p>The runtime is process-wide rather than per-session because the JNI library drives a single
  shared multi-threaded Tokio runtime. The <a href="SessionContext.html" title="class in org.apache.datafusion"><code>SessionContext</code></a> handle is checked only to
  ensure the caller still has a live session; the values returned are not session-specific.

  <p>Requires the <code>runtime-metrics</code> Cargo feature on the native crate (off by default).
  Rebuild with:

  <pre><code>
  RUSTFLAGS="--cfg tokio_unstable" cargo build -p datafusion-jni --features runtime-metrics
  </code></pre>

  <p>If invoked against a native binary built without the feature, this method throws <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link"><code>RuntimeException</code></a> with a message pointing at the rebuild command.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the native crate was built without the <code>runtime-metrics</code>
      feature.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="tableSchema(java.lang.String)">
 <h3>tableSchema</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">org.apache.arrow.vector.types.pojo.Schema</span>&nbsp;<span class="element-name">tableSchema</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;tableName)</span></div>
 <div class="block">Return the Arrow <code>Schema</code> of a registered table. Transferred via Arrow IPC; no <code>BufferAllocator</code> is required because a schema carries no buffer data.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if <code>tableName</code> is not registered in this context.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getOption(java.lang.String)">
 <h3>getOption</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">getOption</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</span></div>
 <div class="block">Read the current value of a <code>datafusion.*</code> config key. The key must be one DataFusion
  recognises (see <a href="SessionContextBuilder.html#setOption(java.lang.String,java.lang.String)"><code>SessionContextBuilder.setOption(String, String)</code></a> for examples and the
  upstream configuration reference for the full list).

  <p><code>datafusion.runtime.*</code> keys (memory limit, temp directory, cache sizes, etc) are not
  yet supported by this getter and will throw. Use the typed <a href="SessionContextBuilder.html#memoryLimit(long,double)"><code>SessionContextBuilder.memoryLimit(long, double)</code></a> and <a href="SessionContextBuilder.html#tempDirectory(java.lang.String)"><code>SessionContextBuilder.tempDirectory(String)</code></a> setters at construction time instead. Round-trip
  support for the runtime subtree is tracked as a follow-up.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the current value as a string, or <code>null</code> if the key is recognised but has no
      value set and no default.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>key</code> is <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the key is not recognised by DataFusion or is in the <code>
      datafusion.runtime.*</code> subtree.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerCsv(java.lang.String,java.lang.String)">
 <h3>registerCsv</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerCsv</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="registerCsv(java.lang.String,java.lang.String,org.apache.datafusion.CsvReadOptions)">
 <h3>registerCsv</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerCsv</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="CsvReadOptions.html" title="class in org.apache.datafusion">CsvReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Register a CSV file (or directory of CSV files) as a table with the supplied <a href="CsvReadOptions.html" title="class in org.apache.datafusion"><code>CsvReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (path not found, schema inference error, etc.).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="readCsv(java.lang.String)">
 <h3>readCsv</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readCsv</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Read a CSV file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="readCsv(java.lang.String,org.apache.datafusion.CsvReadOptions)">
 <h3>readCsv</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readCsv</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="CsvReadOptions.html" title="class in org.apache.datafusion">CsvReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Read a CSV file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="CsvReadOptions.html" title="class in org.apache.datafusion"><code>CsvReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the read fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerJson(java.lang.String,java.lang.String)">
 <h3>registerJson</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerJson</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="registerJson(java.lang.String,java.lang.String,org.apache.datafusion.NdJsonReadOptions)">
 <h3>registerJson</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerJson</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion">NdJsonReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Register a newline-delimited JSON file (or directory of NDJSON files) as a table with the
  supplied <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion"><code>NdJsonReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (path not found, schema inference error, etc.).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="readJson(java.lang.String)">
 <h3>readJson</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readJson</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Read a newline-delimited JSON file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="readJson(java.lang.String,org.apache.datafusion.NdJsonReadOptions)">
 <h3>readJson</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readJson</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion">NdJsonReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Read a newline-delimited JSON file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="NdJsonReadOptions.html" title="class in org.apache.datafusion"><code>NdJsonReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the read fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerParquet(java.lang.String,java.lang.String)">
 <h3>registerParquet</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerParquet</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="registerParquet(java.lang.String,java.lang.String,org.apache.datafusion.ParquetReadOptions)">
 <h3>registerParquet</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerParquet</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ParquetReadOptions.html" title="class in org.apache.datafusion">ParquetReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Register a parquet file as a table with the supplied <a href="ParquetReadOptions.html" title="class in org.apache.datafusion"><code>ParquetReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (path not found, schema mismatch, etc.).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="readParquet(java.lang.String)">
 <h3>readParquet</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readParquet</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Read a parquet file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="readParquet(java.lang.String,org.apache.datafusion.ParquetReadOptions)">
 <h3>readParquet</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readParquet</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ParquetReadOptions.html" title="class in org.apache.datafusion">ParquetReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Read a parquet file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="ParquetReadOptions.html" title="class in org.apache.datafusion"><code>ParquetReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the read fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerArrow(java.lang.String,java.lang.String)">
 <h3>registerArrow</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerArrow</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Register an Arrow IPC file (or directory of Arrow IPC files) as a table.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="registerArrow(java.lang.String,java.lang.String,org.apache.datafusion.ArrowReadOptions)">
 <h3>registerArrow</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerArrow</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion">ArrowReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Register an Arrow IPC file (or directory of Arrow IPC files) as a table with the supplied
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion"><code>ArrowReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if any of <code>name</code>, <code>path</code>, or <code>options</code> is
      <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (path not found, schema mismatch, etc.).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="readArrow(java.lang.String)">
 <h3>readArrow</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readArrow</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Read an Arrow IPC file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="readArrow(java.lang.String,org.apache.datafusion.ArrowReadOptions)">
 <h3>readArrow</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readArrow</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="ArrowReadOptions.html" title="class in org.apache.datafusion">ArrowReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Read an Arrow IPC file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="ArrowReadOptions.html" title="class in org.apache.datafusion"><code>ArrowReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>path</code> or <code>options</code> is <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the read fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerAvro(java.lang.String,java.lang.String)">
 <h3>registerAvro</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerAvro</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Register an Avro file (or directory of Avro files) as a table.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="registerAvro(java.lang.String,java.lang.String,org.apache.datafusion.AvroReadOptions)">
 <h3>registerAvro</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerAvro</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="AvroReadOptions.html" title="class in org.apache.datafusion">AvroReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Register an Avro file (or directory of Avro files) as a table with the supplied <a href="AvroReadOptions.html" title="class in org.apache.datafusion"><code>AvroReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if any of <code>name</code>, <code>path</code>, or <code>options</code> is
      <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (path not found, schema mismatch, etc.).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="readAvro(java.lang.String)">
 <h3>readAvro</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readAvro</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path)</span></div>
 <div class="block">Read an Avro file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> without registering it.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="readAvro(java.lang.String,org.apache.datafusion.AvroReadOptions)">
 <h3>readAvro</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="DataFrame.html" title="class in org.apache.datafusion">DataFrame</a></span>&nbsp;<span class="element-name">readAvro</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;path,
  <a href="AvroReadOptions.html" title="class in org.apache.datafusion">AvroReadOptions</a>&nbsp;options)</span></div>
 <div class="block">Read an Avro file as a <a href="DataFrame.html" title="class in org.apache.datafusion"><code>DataFrame</code></a> with the supplied <a href="AvroReadOptions.html" title="class in org.apache.datafusion"><code>AvroReadOptions</code></a>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>path</code> or <code>options</code> is <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if the read fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerUdf(org.apache.datafusion.ScalarUdf)">
 <h3>registerUdf</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerUdf</span><wbr><span class="parameters">(<a href="ScalarUdf.html" title="class in org.apache.datafusion">ScalarUdf</a>&nbsp;udf)</span></div>
 <div class="block">Register a Java-implemented scalar UDF. After registration, the function can be invoked by SQL
  via the UDF's name or referenced in DataFusion plans deserialised with <a href="#fromProto(byte%5B%5D)"><code>fromProto(byte[])</code></a>.

  <p>The UDF is registered with an exact signature: the runtime will reject calls whose argument
  types do not match the declared <a href="ScalarFunction.html#argFields()"><code>ScalarFunction.argFields()</code></a> exactly.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if registration fails (e.g., name already registered with an
      incompatible signature, schema serialisation failure).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="registerTable(java.lang.String,org.apache.datafusion.TableProvider)">
 <h3>registerTable</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">registerTable</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name,
  <a href="TableProvider.html" title="interface in org.apache.datafusion">TableProvider</a>&nbsp;provider)</span></div>
 <div class="block">Register a Java-implemented <a href="TableProvider.html" title="interface in org.apache.datafusion"><code>TableProvider</code></a> under <code>name</code>. SQL queries that
  reference <code>name</code> call back into <code>provider</code> to fetch batches.

  <p><a href="TableProvider.html#schema()"><code>TableProvider.schema()</code></a> is called once here, on the calling thread, and cached on the
  native side. <a href="TableProvider.html#scan(org.apache.arrow.memory.BufferAllocator)"><code>TableProvider.scan(org.apache.arrow.memory.BufferAllocator)</code></a> is called once
  per query that touches the table, on a Tokio worker thread; it must return a fresh, independent
  <code>ArrowReader</code> on every call, with its buffers allocated from
  the <code>BufferAllocator</code> the framework supplies.

  <p>This is the Java counterpart to DataFusion's Rust <code>SessionContext::register_table</code>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>name</code> or <code>provider</code> is <code>null</code>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if <code>provider.schema()</code> returns <code>null</code>, or this
      context is closed.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/RuntimeException.html" title="class or interface in java.lang" class="external-link">RuntimeException</a></code> - if native registration fails.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="tableExists(java.lang.String)">
 <h3>tableExists</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">tableExists</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</span></div>
 <div class="block">Returns <code>true</code> if a table with the given name is registered in this session.

  <p>This is the Java counterpart to DataFusion's Rust <code>SessionContext::table_exist</code>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="deregisterTable(java.lang.String)">
 <h3>deregisterTable</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">deregisterTable</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</span></div>
 <div class="block">Removes the table with the given name from this session. Does nothing if no table with that
  name is registered.

  <p>This is the Java counterpart to DataFusion's Rust <code>SessionContext::deregister_table</code>.</div>
 <dl class="notes">
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - if this context is closed.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="close()">
 <h3>close</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">close</span>()</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html#close()" title="class or interface in java.lang" class="external-link">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/AutoCloseable.html" title="class or interface in java.lang" class="external-link">AutoCloseable</a></code></dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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