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<h1 title="Uses of Package org.apache.drill.exec.physical.impl.scan.project" class="title">Uses of Package<br>org.apache.drill.exec.physical.impl.scan.project</h1>
</div>
<div class="contentContainer">
<ul class="blockList">
<li class="blockList">
<table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing packages, and an explanation">
<caption><span>Packages that use <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a></span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Package</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="#org.apache.drill.exec.physical.impl.scan.columns">org.apache.drill.exec.physical.impl.scan.columns</a></td>
<td class="colLast">
<div class="block">Handles the special "columns" column used by the text reader,
and available to similar readers.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="#org.apache.drill.exec.physical.impl.scan.file">org.apache.drill.exec.physical.impl.scan.file</a></td>
<td class="colLast">
<div class="block">Handles optional file metadata columns: implicit columns and
partition columns.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="#org.apache.drill.exec.physical.impl.scan.framework">org.apache.drill.exec.physical.impl.scan.framework</a></td>
<td class="colLast">
<div class="block">Defines the projection, vector continuity and other operations for
a set of one or more readers.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="#org.apache.drill.exec.physical.impl.scan.project">org.apache.drill.exec.physical.impl.scan.project</a></td>
<td class="colLast">
<div class="block">Provides run-time semantic analysis of the projection list for the
scan operator.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList"><a name="org.apache.drill.exec.physical.impl.scan.columns">
<!-- -->
</a>
<table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing classes, and an explanation">
<caption><span>Classes in <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a> used by <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/columns/package-summary.html">org.apache.drill.exec.physical.impl.scan.columns</a></span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Class and Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/AbstractUnresolvedColumn.html#org.apache.drill.exec.physical.impl.scan.columns">AbstractUnresolvedColumn</a>
<div class="block">Represents a projected column that has not yet been bound to a
table column, special column or a null column.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ColumnProjection.html#org.apache.drill.exec.physical.impl.scan.columns">ColumnProjection</a>
<div class="block">Core interface for a projected column.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderLevelProjection.ReaderProjectionResolver.html#org.apache.drill.exec.physical.impl.scan.columns">ReaderLevelProjection.ReaderProjectionResolver</a>
<div class="block">Reader-level projection is customizable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedColumn.html#org.apache.drill.exec.physical.impl.scan.columns">ResolvedColumn</a>
<div class="block">A resolved column has a name, and a specification for how to project
data from a source vector to a vector in the final output container.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTableColumn.html#org.apache.drill.exec.physical.impl.scan.columns">ResolvedTableColumn</a>
<div class="block">Column that matches one provided by the table.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTuple.html#org.apache.drill.exec.physical.impl.scan.columns">ResolvedTuple</a>
<div class="block">Drill rows are made up of a tree of tuples, with the row being the root
tuple.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.html#org.apache.drill.exec.physical.impl.scan.columns">ScanLevelProjection</a>
<div class="block">Parses and analyzes the projection list passed to the scanner.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.ScanProjectionParser.html#org.apache.drill.exec.physical.impl.scan.columns">ScanLevelProjection.ScanProjectionParser</a>
<div class="block">Interface for add-on parsers, avoids the need to create
a single, tightly-coupled parser for all types of columns.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.ScanOrchestratorBuilder.html#org.apache.drill.exec.physical.impl.scan.columns">ScanSchemaOrchestrator.ScanOrchestratorBuilder</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/VectorSource.html#org.apache.drill.exec.physical.impl.scan.columns">VectorSource</a>
<div class="block">Generic mechanism for retrieving vectors from a source tuple when
projecting columns to the output tuple.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList"><a name="org.apache.drill.exec.physical.impl.scan.file">
<!-- -->
</a>
<table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing classes, and an explanation">
<caption><span>Classes in <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a> used by <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/file/package-summary.html">org.apache.drill.exec.physical.impl.scan.file</a></span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Class and Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ColumnProjection.html#org.apache.drill.exec.physical.impl.scan.file">ColumnProjection</a>
<div class="block">Core interface for a projected column.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ConstantColumnLoader.ConstantColumnSpec.html#org.apache.drill.exec.physical.impl.scan.file">ConstantColumnLoader.ConstantColumnSpec</a>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/MetadataManager.html#org.apache.drill.exec.physical.impl.scan.file">MetadataManager</a>
<div class="block">Queries can contain a wildcard (*), table columns, or special
system-defined columns (the file metadata columns AKA implicit
columns, the `columns` column of CSV, etc.).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderLevelProjection.ReaderProjectionResolver.html#org.apache.drill.exec.physical.impl.scan.file">ReaderLevelProjection.ReaderProjectionResolver</a>
<div class="block">Reader-level projection is customizable.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedColumn.html#org.apache.drill.exec.physical.impl.scan.file">ResolvedColumn</a>
<div class="block">A resolved column has a name, and a specification for how to project
data from a source vector to a vector in the final output container.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTuple.html#org.apache.drill.exec.physical.impl.scan.file">ResolvedTuple</a>
<div class="block">Drill rows are made up of a tree of tuples, with the row being the root
tuple.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.html#org.apache.drill.exec.physical.impl.scan.file">ScanLevelProjection</a>
<div class="block">Parses and analyzes the projection list passed to the scanner.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.ScanProjectionParser.html#org.apache.drill.exec.physical.impl.scan.file">ScanLevelProjection.ScanProjectionParser</a>
<div class="block">Interface for add-on parsers, avoids the need to create
a single, tightly-coupled parser for all types of columns.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.ScanOrchestratorBuilder.html#org.apache.drill.exec.physical.impl.scan.file">ScanSchemaOrchestrator.ScanOrchestratorBuilder</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/VectorSource.html#org.apache.drill.exec.physical.impl.scan.file">VectorSource</a>
<div class="block">Generic mechanism for retrieving vectors from a source tuple when
projecting columns to the output tuple.</div>
</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList"><a name="org.apache.drill.exec.physical.impl.scan.framework">
<!-- -->
</a>
<table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing classes, and an explanation">
<caption><span>Classes in <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a> used by <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/framework/package-summary.html">org.apache.drill.exec.physical.impl.scan.framework</a></span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Class and Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderSchemaOrchestrator.html#org.apache.drill.exec.physical.impl.scan.framework">ReaderSchemaOrchestrator</a>
<div class="block">Orchestrates projection tasks for a single reader within the set that the
scan operator manages.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.html#org.apache.drill.exec.physical.impl.scan.framework">ScanSchemaOrchestrator</a>
<div class="block">Performs projection of a record reader, along with a set of static
columns, to produce the final "public" result set (record batch)
for the scan operator.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.ScanOrchestratorBuilder.html#org.apache.drill.exec.physical.impl.scan.framework">ScanSchemaOrchestrator.ScanOrchestratorBuilder</a>&nbsp;</td>
</tr>
</tbody>
</table>
</li>
<li class="blockList"><a name="org.apache.drill.exec.physical.impl.scan.project">
<!-- -->
</a>
<table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing classes, and an explanation">
<caption><span>Classes in <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a> used by <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a></span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Class and Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/AbstractUnresolvedColumn.html#org.apache.drill.exec.physical.impl.scan.project">AbstractUnresolvedColumn</a>
<div class="block">Represents a projected column that has not yet been bound to a
table column, special column or a null column.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ColumnProjection.html#org.apache.drill.exec.physical.impl.scan.project">ColumnProjection</a>
<div class="block">Core interface for a projected column.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ConstantColumnLoader.ConstantColumnSpec.html#org.apache.drill.exec.physical.impl.scan.project">ConstantColumnLoader.ConstantColumnSpec</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/MetadataManager.html#org.apache.drill.exec.physical.impl.scan.project">MetadataManager</a>
<div class="block">Queries can contain a wildcard (*), table columns, or special
system-defined columns (the file metadata columns AKA implicit
columns, the `columns` column of CSV, etc.).</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/NullColumnBuilder.html#org.apache.drill.exec.physical.impl.scan.project">NullColumnBuilder</a>
<div class="block">Manages null columns by creating a null column loader for each
set of non-empty null columns.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/NullColumnBuilder.NullBuilderBuilder.html#org.apache.drill.exec.physical.impl.scan.project">NullColumnBuilder.NullBuilderBuilder</a>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/NullColumnLoader.NullColumnSpec.html#org.apache.drill.exec.physical.impl.scan.project">NullColumnLoader.NullColumnSpec</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderLevelProjection.html#org.apache.drill.exec.physical.impl.scan.project">ReaderLevelProjection</a>
<div class="block">Computes the full output schema given a table (or batch)
schema.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderLevelProjection.ReaderProjectionResolver.html#org.apache.drill.exec.physical.impl.scan.project">ReaderLevelProjection.ReaderProjectionResolver</a>
<div class="block">Reader-level projection is customizable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ReaderSchemaOrchestrator.html#org.apache.drill.exec.physical.impl.scan.project">ReaderSchemaOrchestrator</a>
<div class="block">Orchestrates projection tasks for a single reader within the set that the
scan operator manages.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedColumn.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedColumn</a>
<div class="block">A resolved column has a name, and a specification for how to project
data from a source vector to a vector in the final output container.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedDictColumn.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedDictColumn</a>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedMapColumn.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedMapColumn</a>
<div class="block">Represents a column which is implicitly a map (because it has children
in the project list), but which does not match any column in the table.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedNullColumn.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedNullColumn</a>
<div class="block">Projected column that serves as both a resolved column (provides projection
mapping) and a null column spec (provides the information needed to create
the required null vectors.)</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTuple.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedTuple</a>
<div class="block">Drill rows are made up of a tree of tuples, with the row being the root
tuple.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTuple.ResolvedDict.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedTuple.ResolvedDict</a>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ResolvedTuple.ResolvedMap.html#org.apache.drill.exec.physical.impl.scan.project">ResolvedTuple.ResolvedMap</a>
<div class="block">Represents a map implied by the project list, whether or not the map
actually appears in the table schema.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.html#org.apache.drill.exec.physical.impl.scan.project">ScanLevelProjection</a>
<div class="block">Parses and analyzes the projection list passed to the scanner.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.Builder.html#org.apache.drill.exec.physical.impl.scan.project">ScanLevelProjection.Builder</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.ScanProjectionParser.html#org.apache.drill.exec.physical.impl.scan.project">ScanLevelProjection.ScanProjectionParser</a>
<div class="block">Interface for add-on parsers, avoids the need to create
a single, tightly-coupled parser for all types of columns.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanLevelProjection.ScanProjectionType.html#org.apache.drill.exec.physical.impl.scan.project">ScanLevelProjection.ScanProjectionType</a>
<div class="block">Identifies the kind of projection done for this scan.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.html#org.apache.drill.exec.physical.impl.scan.project">ScanSchemaOrchestrator</a>
<div class="block">Performs projection of a record reader, along with a set of static
columns, to produce the final "public" result set (record batch)
for the scan operator.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.ScanOrchestratorBuilder.html#org.apache.drill.exec.physical.impl.scan.project">ScanSchemaOrchestrator.ScanOrchestratorBuilder</a>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/ScanSchemaOrchestrator.ScanSchemaOptions.html#org.apache.drill.exec.physical.impl.scan.project">ScanSchemaOrchestrator.ScanSchemaOptions</a>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/SchemaSmoother.html#org.apache.drill.exec.physical.impl.scan.project">SchemaSmoother</a>
<div class="block">Implements a "schema smoothing" algorithm.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/SchemaSmoother.IncompatibleSchemaException.html#org.apache.drill.exec.physical.impl.scan.project">SchemaSmoother.IncompatibleSchemaException</a>
<div class="block">Exception thrown if the prior schema is not compatible with the
new table schema.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/class-use/StaticColumnLoader.html#org.apache.drill.exec.physical.impl.scan.project">StaticColumnLoader</a>
<div class="block">Base class for columns that take values based on the
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