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<div class="subTitle">org.apache.drill.exec.physical.rowSet</div>
<h2 title="Interface RowSet" class="title">Interface RowSet</h2>
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<dt>All Known Subinterfaces:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.ExtendableRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.ExtendableRowSet</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.HyperRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.HyperRowSet</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.SingleRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.SingleRowSet</a></dd>
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<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/physical/rowSet/AbstractRowSet.html" title="class in org.apache.drill.exec.physical.rowSet">AbstractRowSet</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/AbstractSingleRowSet.html" title="class in org.apache.drill.exec.physical.rowSet">AbstractSingleRowSet</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/DirectRowSet.html" title="class in org.apache.drill.exec.physical.rowSet">DirectRowSet</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/HyperRowSetImpl.html" title="class in org.apache.drill.exec.physical.rowSet">HyperRowSetImpl</a>, <a href="../../../../../../org/apache/drill/exec/physical/rowSet/IndirectRowSet.html" title="class in org.apache.drill.exec.physical.rowSet">IndirectRowSet</a></dd>
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<pre>public interface <span class="typeNameLabel">RowSet</span></pre>
<div class="block">A row set is a collection of rows stored as value vectors. Elsewhere in
Drill we call this a "record batch", but that term has been overloaded to
mean the runtime implementation of an operator.
<p>
A row set encapsulates a set of vectors and provides access to Drill's
various "views" of vectors: <a href="../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record"><code>VectorContainer</code></a>,
<a href="../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record"><code>VectorAccessible</code></a>, etc. The row set wraps a {#link TupleModel}
which holds the vectors and column metadata. This form is optimized
for easy use in testing; use other implementations for production code.
<p>
A row set is defined by a <a href="../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata"><code>TupleMetadata</code></a>. For testing purposes, a row
set has a fixed schema; we don't allow changing the set of vectors
dynamically.
<p>
The row set also provides a simple way to write and read records using the
<a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSetWriter.html" title="interface in org.apache.drill.exec.physical.rowSet"><code>RowSetWriter</code></a> and <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSetReader.html" title="interface in org.apache.drill.exec.physical.rowSet"><code>RowSetReader</code></a> interfaces. As per Drill
conventions, a row set can be written (once), read many times, and finally
cleared.
<p>
Drill provides a large number of vector (data) types. Each requires a
type-specific way to set data. The row set writer uses a
<a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html" title="interface in org.apache.drill.exec.vector.accessor"><code>ColumnWriter</code></a>
to set each value in a way unique to the specific data type. Similarly, the
row set reader provides a <a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html" title="interface in org.apache.drill.exec.vector.accessor"><code>ScalarReader</code></a>
interface. In both cases, columns can be accessed by index number
(as defined in the schema) or by name.
<p>
A row set follows a schema. The schema starts as a
<a href="../../../../../../org/apache/drill/exec/record/BatchSchema.html" title="class in org.apache.drill.exec.record"><code>BatchSchema</code></a>, but is parsed and restructured into a variety of
forms. In the original form, maps contain their value vectors. In the
flattened form, all vectors for all maps (and the top-level tuple) are
collected into a single structure. Since this structure is for testing,
this somewhat-static structure works just file; we don't need the added
complexity that comes from building the schema and data dynamically.
<p>
Putting this all together, the typical life-cycle flow is:
<ul>
<li>Define the schema using <a href="../../../../../../org/apache/drill/exec/record/metadata/SchemaBuilder.html" title="class in org.apache.drill.exec.record.metadata"><code>SchemaBuilder</code></a>.</li>
<li>Create the row set from the schema.</li>
<li>Populate the row set using a writer from <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.ExtendableRowSet.html#writer-int-"><code>RowSet.ExtendableRowSet.writer(int)</code></a>.</li>
<li>Process the vector container using the code under test.</li>
<li>Retrieve the results using a reader from <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#reader--"><code>reader()</code></a>.</li>
<li>Dispose of vector memory with <a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#clear--"><code>clear()</code></a>.</li>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.ExtendableRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.ExtendableRowSet</a></span></code>
<div class="block">Single row set which is empty and allows writing.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.HyperRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.HyperRowSet</a></span></code>
<div class="block">Row set comprised of multiple single row sets, along with
an indirection vector (SV4).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.HyperRowSetBuilder.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.HyperRowSetBuilder</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.SingleRowSet.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSet.SingleRowSet</a></span></code>
<div class="block">Row set that manages a single batch of rows.</div>
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<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#allocator--">allocator</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/BatchSchema.html" title="class in org.apache.drill.exec.record">BatchSchema</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#batchSchema--">batchSchema</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#clear--">clear</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#container--">container</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/BatchSchema.SelectionVectorMode.html" title="enum in org.apache.drill.exec.record">BatchSchema.SelectionVectorMode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#indirectionType--">indirectionType</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#isExtendable--">isExtendable</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#isWritable--">isWritable</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#print--">print</a></span>()</code>
<div class="block">Debug-only tool to visualize a row set for inspection.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSetReader.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSetReader</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#reader--">reader</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#rowCount--">rowCount</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata">TupleMetadata</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#schema--">schema</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#size--">size</a></span>()</code>
<div class="block">Return the size in memory of this record set, including indirection
vectors, null vectors, offset vectors and the entire (used and unused)
data vectors.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSet.html#vectorAccessible--">vectorAccessible</a></span>()</code>&nbsp;</td>
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<h4>isExtendable</h4>
<pre>boolean&nbsp;isExtendable()</pre>
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<pre>boolean&nbsp;isWritable()</pre>
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<h4>vectorAccessible</h4>
<pre><a href="../../../../../../org/apache/drill/exec/record/VectorAccessible.html" title="interface in org.apache.drill.exec.record">VectorAccessible</a>&nbsp;vectorAccessible()</pre>
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<pre><a href="../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a>&nbsp;container()</pre>
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<h4>rowCount</h4>
<pre>int&nbsp;rowCount()</pre>
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<h4>reader</h4>
<pre><a href="../../../../../../org/apache/drill/exec/physical/rowSet/RowSetReader.html" title="interface in org.apache.drill.exec.physical.rowSet">RowSetReader</a>&nbsp;reader()</pre>
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<h4>clear</h4>
<pre>void&nbsp;clear()</pre>
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<h4>schema</h4>
<pre><a href="../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata">TupleMetadata</a>&nbsp;schema()</pre>
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<h4>allocator</h4>
<pre><a href="../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a>&nbsp;allocator()</pre>
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<h4>indirectionType</h4>
<pre><a href="../../../../../../org/apache/drill/exec/record/BatchSchema.SelectionVectorMode.html" title="enum in org.apache.drill.exec.record">BatchSchema.SelectionVectorMode</a>&nbsp;indirectionType()</pre>
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<h4>print</h4>
<pre>void&nbsp;print()</pre>
<div class="block">Debug-only tool to visualize a row set for inspection.
<b>Do not</b> use this in production code.</div>
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<h4>size</h4>
<pre>long&nbsp;size()</pre>
<div class="block">Return the size in memory of this record set, including indirection
vectors, null vectors, offset vectors and the entire (used and unused)
data vectors.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>memory size in bytes</dd>
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<pre><a href="../../../../../../org/apache/drill/exec/record/BatchSchema.html" title="class in org.apache.drill.exec.record">BatchSchema</a>&nbsp;batchSchema()</pre>
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