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| <div class="subTitle">org.apache.drill.exec.physical.resultSet.project</div> |
| <h2 title="Class RequestedTupleImpl" class="title">Class RequestedTupleImpl</h2> |
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| <li>org.apache.drill.exec.physical.resultSet.project.RequestedTupleImpl</li> |
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| <dd><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></dd> |
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| <pre>public class <span class="typeNameLabel">RequestedTupleImpl</span> |
| extends <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> |
| implements <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></pre> |
| <div class="block">Represents an explicit projection at some tuple level. A tuple is the |
| top-level row or a map. |
| <p> |
| A column is projected if it is explicitly listed in the selection list. |
| <p> |
| If a column is a map, then the projection for the map's columns is based on |
| two rules: |
| <ol> |
| <li>If the projection list includes at least one explicit mention of a map |
| member, then include only those columns explicitly listed.</li> |
| <li>If the projection at the parent level lists only the map column itself |
| (which the projection can't know is a map), then assume this implies all |
| columns, as if the entry where "map.*".</li> |
| </ol> |
| <p> |
| Examples:<br> |
| <code>m</code><br> |
| If <code>m</code> turns out to be a map, project all members of |
| <code>m</code>.<br> |
| <code>m.a</code><br> |
| Column <code>m</code> must be a map. Project only column <code>a</code>.<br> |
| <code>m, m.a</code><br> |
| Tricky case. We interpret this as projecting only the "a" element of map m. |
| <p> |
| The projection set is built from a list of columns, represented as |
| <a href="../../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression"><code>SchemaPath</code></a> objects, provided by the physical plan. The structure of |
| <tt>SchemaPath</tt> is a bit awkward: |
| <p> |
| <ul> |
| <li><tt>SchemaPath> is a wrapper for a column which directly holds the |
| <tt>NameSegment</tt> for the top-level column.</li> |
| <li><tt>NameSegment</tt> holds a name. This can be a top name such as |
| `a`, or parts of a compound name such as `a`.`b`. Each <tt>NameSegment</tt> |
| has a "child" that points to the option following parts of the name.</li> |
| <li><PathSegment</tt> is the base class for the parts of a name.</tt> |
| <li><tt>ArraySegment</tt> is the other kind of name part and represents |
| an array index such as the "[1]" in `columns`[1].</li> |
| <ul> |
| The parser considers names and array indexes. Example:<pre><code> |
| a |
| a.b |
| a[2] |
| a[2].b |
| a[1][2][3] |
| a[1][2][3].b.c |
| a['foo'][0].b['bar'] |
| </code></pre> |
| |
| <h4>Usage</h4> |
| The projection information is a <i>pattern</i> which supports queries of the |
| form "is this column projected", and "if projected, is the projection consistent |
| with such-and-so concrete type?" Clients should not try to work out the |
| meaning of the pattern: doing so is very complex. Instead, do the following: |
| |
| <pre><code> |
| String colName = ...; |
| ColumnMetadata colDef = ...; |
| InputTupleProjection tupleProj = ... |
| if (tupleProj.isProjected(colName)) { |
| if (!tupleProj.isComsistentWith(colDef)) { |
| // Raise an error |
| } |
| // Handle a projected column. |
| }</code></pre></div> |
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| <h3>Nested classes/interfaces inherited from interface org.apache.drill.exec.physical.resultSet.project.<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.TupleProjectionType.html" title="enum in org.apache.drill.exec.physical.resultSet.project">RequestedTuple.TupleProjectionType</a></code></li> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.TupleProjectionType.html" title="enum in org.apache.drill.exec.physical.resultSet.project">RequestedTuple.TupleProjectionType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#projectionType">projectionType</a></span></code> </td> |
| </tr> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#RequestedTupleImpl--">RequestedTupleImpl</a></span>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#RequestedTupleImpl-java.util.List-">RequestedTupleImpl</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a>> cols)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#RequestedTupleImpl-org.apache.drill.exec.physical.resultSet.project.RequestedColumnImpl-">RequestedTupleImpl</a></span>(<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumnImpl.html" title="class in org.apache.drill.exec.physical.resultSet.project">RequestedColumnImpl</a> parent)</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#buildName-java.lang.StringBuilder-">buildName</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a> buf)</code> </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/physical/resultSet/project/RequestedTupleImpl.html#enforceProjection-org.apache.drill.exec.record.metadata.ColumnMetadata-org.apache.drill.common.exceptions.CustomErrorContext-">enforceProjection</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema, |
| <a href="../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a> errorContext)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#get-int-">get</a></span>(int i)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#get-java.lang.String-">get</a></span>(<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> colName)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumnImpl.html" title="class in org.apache.drill.exec.physical.resultSet.project">RequestedColumnImpl</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#getImpl-java.lang.String-">getImpl</a></span>(<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> colName)</code> </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/resultSet/project/RequestedTupleImpl.html#isEmpty--">isEmpty</a></span>()</code> |
| <div class="block">Report if the projection is empty as occurs in |
| <code>SELECT COUNT(*) FROM ...</code>.</div> |
| </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/resultSet/project/RequestedTupleImpl.html#isProjected-org.apache.drill.exec.record.metadata.ColumnMetadata-">isProjected</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#isProjected-java.lang.String-">isProjected</a></span>(<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> colName)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#mapProjection-java.lang.String-">mapProjection</a></span>(<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> colName)</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#project-java.lang.String-">project</a></span>(<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> colName)</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#projections--">projections</a></span>()</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#size--">size</a></span>()</code> </td> |
| </tr> |
| <tr id="i12" 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/physical/resultSet/project/RequestedTupleImpl.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.TupleProjectionType.html" title="enum in org.apache.drill.exec.physical.resultSet.project">RequestedTuple.TupleProjectionType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTupleImpl.html#type--">type</a></span>()</code> |
| <div class="block">Tuple projection type.</div> |
| </td> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="projectionType"> |
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| </a> |
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| <h4>projectionType</h4> |
| <pre>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.TupleProjectionType.html" title="enum in org.apache.drill.exec.physical.resultSet.project">RequestedTuple.TupleProjectionType</a> projectionType</pre> |
| </li> |
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| <pre>public RequestedTupleImpl()</pre> |
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| <h4>RequestedTupleImpl</h4> |
| <pre>public RequestedTupleImpl(<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumnImpl.html" title="class in org.apache.drill.exec.physical.resultSet.project">RequestedColumnImpl</a> parent)</pre> |
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| <h4>RequestedTupleImpl</h4> |
| <pre>public RequestedTupleImpl(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a>> cols)</pre> |
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| <pre>public int size()</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#size--">size</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a> get(int i)</pre> |
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| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a> get(<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> colName)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#get-java.lang.String-">get</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <pre>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumnImpl.html" title="class in org.apache.drill.exec.physical.resultSet.project">RequestedColumnImpl</a> getImpl(<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> colName)</pre> |
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| <h4>project</h4> |
| <pre>protected <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a> project(<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> colName)</pre> |
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| <h4>projections</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedColumn.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedColumn</a>> projections()</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#projections--">projections</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <h4>buildName</h4> |
| <pre>public void buildName(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a> buf)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#buildName-java.lang.StringBuilder-">buildName</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.TupleProjectionType.html" title="enum in org.apache.drill.exec.physical.resultSet.project">RequestedTuple.TupleProjectionType</a> type()</pre> |
| <div class="block">Tuple projection type. This is a rough approximation. A scan-level projection |
| may include both a wildcard and implicit columns. This form is best used |
| in testing where such ambiguities do not apply.</div> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#type--">type</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <pre>public boolean isProjected(<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> colName)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#isProjected-java.lang.String-">isProjected</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <pre>public boolean isProjected(<a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#isProjected-org.apache.drill.exec.record.metadata.ColumnMetadata-">isProjected</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <h4>enforceProjection</h4> |
| <pre>public boolean enforceProjection(<a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema, |
| <a href="../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a> errorContext)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#enforceProjection-org.apache.drill.exec.record.metadata.ColumnMetadata-org.apache.drill.common.exceptions.CustomErrorContext-">enforceProjection</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <h4>mapProjection</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a> mapProjection(<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> colName)</pre> |
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| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#mapProjection-java.lang.String-">mapProjection</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
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| <h4>toString</h4> |
| <pre>public <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> toString()</pre> |
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| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code> in class <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></dd> |
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| <h4>isEmpty</h4> |
| <pre>public boolean isEmpty()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#isEmpty--">RequestedTuple</a></code></span></div> |
| <div class="block">Report if the projection is empty as occurs in |
| <code>SELECT COUNT(*) FROM ...</code>. This is <i>not</i> the |
| same as asking if this tuple is unprojected, as that concept |
| does not apply to tuples, only to the column that contains the |
| tuple.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html#isEmpty--">isEmpty</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/project/RequestedTuple.html" title="interface in org.apache.drill.exec.physical.resultSet.project">RequestedTuple</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the projection set is empty</dd> |
| </dl> |
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| </li> |
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