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<div class="subTitle">org.apache.drill.exec.vector.accessor</div>
<h2 title="Interface ScalarReader" class="title">Interface ScalarReader</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnReader</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/vector/accessor/reader/AbstractScalarReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">AbstractScalarReader</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/reader/AbstractScalarReader.NullReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">AbstractScalarReader.NullReader</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/reader/BaseScalarReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">BaseScalarReader</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/reader/BaseScalarReader.BaseFixedWidthReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">BaseScalarReader.BaseFixedWidthReader</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/reader/BaseScalarReader.BaseVarWidthReader.html" title="class in 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<br>
<pre>public interface <span class="typeNameLabel">ScalarReader</span>
extends <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnReader</a></pre>
<div class="block">Defines a reader to obtain values from value vectors using
a simple, uniform interface. Vector values are mapped to
their "natural" representations: the representation closest
to the actual vector value. For date and time values, this
generally means a numeric value. Applications can then map
this value to Java objects as desired. Decimal types all
map to BigDecimal as that is the only way in Java to
represent large decimal values.
<p>
In general, a column maps to just one value. However, derived
classes may choose to provide type conversions if convenient.
An exception is thrown if a call is made to a method that
is not supported by the column type.
<p>
Values of scalars are provided directly, using the get method
for the target type. Maps and arrays are structured types and
require another level of reader abstraction to access each value
in the structure.
<h4>Joda Period</h4>
Note that the interval columns here use the old Joda classes.
As it turns out, JSR-310, the specification on which the Java 8 date/time
classes are based, does not include the equivalent of the old Joda
Interval class: a single object which can hold years, months, days,
hours, minutes and seconds. Instead, JSR-310 has a Duration (for time)
and a Period (for dates). Drill may have to create its own class
to model the Drill INTERVAL type in JSR-310. Until then, we are stuck
with the Joda classes.
<p>
See <a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarWriter.html" title="interface in org.apache.drill.exec.vector.accessor"><code>ScalarWriter</code></a></div>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueType.html" title="enum in org.apache.drill.exec.vector.accessor">ValueType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#extendedType--">extendedType</a></span>()</code>
<div class="block">The extended type of the value, describes the secondary type
for DATE, TIME and TIMESTAMP for which the value type is
int or long.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getBoolean--">getBoolean</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getBytes--">getBytes</a></span>()</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html?is-external=true" title="class or interface in java.time">LocalDate</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getDate--">getDate</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true" title="class or interface in java.math">BigDecimal</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getDecimal--">getDecimal</a></span>()</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getDouble--">getDouble</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getFloat--">getFloat</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getInt--">getInt</a></span>()</code>&nbsp;</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getLong--">getLong</a></span>()</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>org.joda.time.Period</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getPeriod--">getPeriod</a></span>()</code>&nbsp;</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getString--">getString</a></span>()</code>&nbsp;</td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html?is-external=true" title="class or interface in java.time">LocalTime</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getTime--">getTime</a></span>()</code>&nbsp;</td>
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<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html?is-external=true" title="class or interface in java.time">Instant</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getTimestamp--">getTimestamp</a></span>()</code>&nbsp;</td>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#getValue--">getValue</a></span>()</code>
<div class="block">Return the value of the object using the extended type.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueType.html" title="enum in org.apache.drill.exec.vector.accessor">ValueType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarReader.html#valueType--">valueType</a></span>()</code>
<div class="block">Describe the type of the value.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.drill.exec.vector.accessor.<a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnReader</a></h3>
<code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html#getAsString--">getAsString</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html#getObject--">getObject</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html#isNull--">isNull</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html#schema--">schema</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnReader.html#type--">type</a></code></li>
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<h3>Method Detail</h3>
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<h4>valueType</h4>
<pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueType.html" title="enum in org.apache.drill.exec.vector.accessor">ValueType</a>&nbsp;valueType()</pre>
<div class="block">Describe the type of the value. This is a compression of the
value vector type: it describes which method will return the
vector value.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the value type which indicates which get method
is valid for the column</dd>
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<h4>extendedType</h4>
<pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ValueType.html" title="enum in org.apache.drill.exec.vector.accessor">ValueType</a>&nbsp;extendedType()</pre>
<div class="block">The extended type of the value, describes the secondary type
for DATE, TIME and TIMESTAMP for which the value type is
int or long.</div>
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<a name="getInt--">
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<h4>getInt</h4>
<pre>int&nbsp;getInt()</pre>
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<a name="getBoolean--">
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<h4>getBoolean</h4>
<pre>boolean&nbsp;getBoolean()</pre>
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<a name="getLong--">
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<h4>getLong</h4>
<pre>long&nbsp;getLong()</pre>
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<h4>getFloat</h4>
<pre>float&nbsp;getFloat()</pre>
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<a name="getDouble--">
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<h4>getDouble</h4>
<pre>double&nbsp;getDouble()</pre>
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<a name="getString--">
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<h4>getString</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getString()</pre>
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<h4>getBytes</h4>
<pre>byte[]&nbsp;getBytes()</pre>
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<a name="getDecimal--">
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<h4>getDecimal</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true" title="class or interface in java.math">BigDecimal</a>&nbsp;getDecimal()</pre>
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<a name="getPeriod--">
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<h4>getPeriod</h4>
<pre>org.joda.time.Period&nbsp;getPeriod()</pre>
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<a name="getDate--">
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<h4>getDate</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html?is-external=true" title="class or interface in java.time">LocalDate</a>&nbsp;getDate()</pre>
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<a name="getTime--">
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<h4>getTime</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html?is-external=true" title="class or interface in java.time">LocalTime</a>&nbsp;getTime()</pre>
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<h4>getTimestamp</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html?is-external=true" title="class or interface in java.time">Instant</a>&nbsp;getTimestamp()</pre>
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<h4>getValue</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;getValue()</pre>
<div class="block">Return the value of the object using the extended type.</div>
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