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<div class="subTitle">org.apache.drill.exec.physical.base</div>
<h2 title="Interface GroupScan" class="title">Interface GroupScan</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/physical/base/FragmentLeaf.html" title="interface in org.apache.drill.exec.physical.base">FragmentLeaf</a>, <a href="../../../../../../org/apache/drill/common/graph/GraphValue.html" title="interface in org.apache.drill.common.graph">GraphValue</a>&lt;<a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html" title="interface in org.apache.drill.exec.physical.base">PhysicalOperator</a>&gt;, <a href="../../../../../../org/apache/drill/exec/physical/base/HasAffinity.html" title="interface in org.apache.drill.exec.physical.base">HasAffinity</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;<a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html" title="interface in org.apache.drill.exec.physical.base">PhysicalOperator</a>&gt;, <a href="../../../../../../org/apache/drill/exec/physical/base/Leaf.html" title="interface in org.apache.drill.exec.physical.base">Leaf</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html" title="interface in org.apache.drill.exec.physical.base">PhysicalOperator</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/Scan.html" title="interface in org.apache.drill.exec.physical.base">Scan</a></dd>
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<dl>
<dt>All Known Subinterfaces:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/physical/base/DbGroupScan.html" title="interface in org.apache.drill.exec.physical.base">DbGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/FileGroupScan.html" title="interface in org.apache.drill.exec.physical.base">FileGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/IndexGroupScan.html" title="interface in org.apache.drill.exec.physical.base">IndexGroupScan</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../../org/apache/drill/exec/physical/base/AbstractDbGroupScan.html" title="class in org.apache.drill.exec.physical.base">AbstractDbGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/AbstractFileGroupScan.html" title="class in org.apache.drill.exec.physical.base">AbstractFileGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/AbstractGroupScan.html" title="class in org.apache.drill.exec.physical.base">AbstractGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/AbstractGroupScanWithMetadata.html" title="class in org.apache.drill.exec.physical.base">AbstractGroupScanWithMetadata</a>, <a href="../../../../../../org/apache/drill/exec/store/parquet/AbstractParquetGroupScan.html" title="class in org.apache.drill.exec.store.parquet">AbstractParquetGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/mapr/db/binary/BinaryTableGroupScan.html" title="class in org.apache.drill.exec.store.mapr.db.binary">BinaryTableGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/direct/DirectGroupScan.html" title="class in org.apache.drill.exec.store.direct">DirectGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/druid/DruidGroupScan.html" title="class in org.apache.drill.exec.store.druid">DruidGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/dfs/easy/EasyGroupScan.html" title="class in org.apache.drill.exec.store.dfs.easy">EasyGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/enumerable/EnumerableGroupScan.html" title="class in org.apache.drill.exec.store.enumerable">EnumerableGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/hbase/HBaseGroupScan.html" title="class in org.apache.drill.exec.store.hbase">HBaseGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/hive/HiveDrillNativeParquetScan.html" title="class in org.apache.drill.exec.store.hive">HiveDrillNativeParquetScan</a>, <a href="../../../../../../org/apache/drill/exec/store/hive/HiveScan.html" title="class in org.apache.drill.exec.store.hive">HiveScan</a>, <a href="../../../../../../org/apache/drill/exec/store/http/HttpGroupScan.html" title="class in org.apache.drill.exec.store.http">HttpGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/iceberg/IcebergGroupScan.html" title="class in org.apache.drill.exec.store.iceberg">IcebergGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/ischema/InfoSchemaGroupScan.html" title="class in org.apache.drill.exec.store.ischema">InfoSchemaGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/jdbc/JdbcGroupScan.html" title="class in org.apache.drill.exec.store.jdbc">JdbcGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/mapr/db/json/JsonTableGroupScan.html" title="class in org.apache.drill.exec.store.mapr.db.json">JsonTableGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/kafka/KafkaGroupScan.html" title="class in org.apache.drill.exec.store.kafka">KafkaGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/kudu/KuduGroupScan.html" title="class in org.apache.drill.exec.store.kudu">KuduGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/mapr/db/MapRDBGroupScan.html" title="class in org.apache.drill.exec.store.mapr.db">MapRDBGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/direct/MetadataDirectGroupScan.html" title="class in org.apache.drill.exec.store.direct">MetadataDirectGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/mock/MockGroupScanPOP.html" title="class in org.apache.drill.exec.store.mock">MockGroupScanPOP</a>, <a href="../../../../../../org/apache/drill/exec/store/mongo/MongoGroupScan.html" title="class in org.apache.drill.exec.store.mongo">MongoGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/openTSDB/OpenTSDBGroupScan.html" title="class in org.apache.drill.exec.store.openTSDB">OpenTSDBGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/parquet/ParquetGroupScan.html" title="class in org.apache.drill.exec.store.parquet">ParquetGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/phoenix/PhoenixGroupScan.html" title="class in org.apache.drill.exec.store.phoenix">PhoenixGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/mapr/db/json/RestrictedJsonTableGroupScan.html" title="class in org.apache.drill.exec.store.mapr.db.json">RestrictedJsonTableGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/SchemalessScan.html" title="class in org.apache.drill.exec.physical.base">SchemalessScan</a>, <a href="../../../../../../org/apache/drill/exec/store/splunk/SplunkGroupScan.html" title="class in org.apache.drill.exec.store.splunk">SplunkGroupScan</a>, <a href="../../../../../../org/apache/drill/exec/store/sys/SystemTableScan.html" title="class in org.apache.drill.exec.store.sys">SystemTableScan</a></dd>
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<br>
<pre>public interface <span class="typeNameLabel">GroupScan</span>
extends <a href="../../../../../../org/apache/drill/exec/physical/base/Scan.html" title="interface in org.apache.drill.exec.physical.base">Scan</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/HasAffinity.html" title="interface in org.apache.drill.exec.physical.base">HasAffinity</a></pre>
<div class="block">A GroupScan operator represents all data which will be scanned by a given physical
plan. It is the superset of all SubScans for the plan.</div>
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<h3>Field Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<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>static <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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#ALL_COLUMNS">ALL_COLUMNS</a></span></code>
<div class="block">columns list in GroupScan : 1) empty_column is for skipAll query.</div>
</td>
</tr>
</table>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<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><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated 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>
</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/base/GroupScan.html#applyAssignments-java.util.List-">applyAssignments</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>&lt;<a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a>&gt;&nbsp;endpoints)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base">GroupScan</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#applyFilter-org.apache.drill.common.expression.LogicalExpression-org.apache.drill.exec.ops.UdfUtilities-org.apache.drill.exec.expr.fn.FunctionImplementationRegistry-org.apache.drill.exec.server.options.OptionManager-">applyFilter</a></span>(<a href="../../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;filterExpr,
<a href="../../../../../../org/apache/drill/exec/ops/UdfUtilities.html" title="interface in org.apache.drill.exec.ops">UdfUtilities</a>&nbsp;udfUtilities,
<a href="../../../../../../org/apache/drill/exec/expr/fn/FunctionImplementationRegistry.html" title="class in org.apache.drill.exec.expr.fn">FunctionImplementationRegistry</a>&nbsp;functionImplementationRegistry,
<a href="../../../../../../org/apache/drill/exec/server/options/OptionManager.html" title="interface in org.apache.drill.exec.server.options">OptionManager</a>&nbsp;optionManager)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base">GroupScan</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#applyLimit-int-">applyLimit</a></span>(int&nbsp;maxRecords)</code>
<div class="block">Apply rowcount based prune for "LIMIT n" query.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#canPushdownProjects-java.util.List-">canPushdownProjects</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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;&nbsp;columns)</code>
<div class="block">GroupScan should check the list of columns, and see if it could support all the columns in the list.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base">GroupScan</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#clone-java.util.List-">clone</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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;&nbsp;columns)</code>
<div class="block">Returns a clone of GroupScan instance, except that the new GroupScan will use the provided list of columns .</div>
</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/base/GroupScan.html#enforceWidth--">enforceWidth</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getMinParallelizationWidth--"><code>getMinParallelizationWidth()</code></a> to determine whether this GroupScan spans more than one
fragment.</span></div>
</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/metastore/analyze/AnalyzeInfoProvider.html" title="interface in org.apache.drill.exec.metastore.analyze">AnalyzeInfoProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getAnalyzeInfoProvider--">getAnalyzeInfoProvider</a></span>()</code>
<div class="block">Returns <a href="../../../../../../org/apache/drill/exec/metastore/analyze/AnalyzeInfoProvider.html" title="interface in org.apache.drill.exec.metastore.analyze"><code>AnalyzeInfoProvider</code></a> instance which will be used when running ANALYZE statement.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getColumns--">getColumns</a></span>()</code>
<div class="block">Returns a list of columns scanned by this group scan</div>
</td>
</tr>
<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/physical/base/GroupScan.html#getColumnValueCount-org.apache.drill.common.expression.SchemaPath-">getColumnValueCount</a></span>(<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&nbsp;column)</code>
<div class="block">Return the number of non-null value in the specified column.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<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/base/GroupScan.html#getDigest--">getDigest</a></span>()</code>
<div class="block">Returns a signature of the <a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base"><code>GroupScan</code></a> which should usually be composed of
all its attributes which could describe it uniquely.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.fs.Path&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getFiles--">getFiles</a></span>()</code>
<div class="block">Returns a collection of file names associated with this GroupScan.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getFilter--">getFilter</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getMaxParallelizationWidth--">getMaxParallelizationWidth</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadataProvider.html" title="interface in org.apache.drill.metastore.metadata">TableMetadataProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getMetadataProvider--">getMetadataProvider</a></span>()</code>
<div class="block">Returns <a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadataProvider.html" title="interface in org.apache.drill.metastore.metadata"><code>TableMetadataProvider</code></a> instance which is used for providing metadata for current <a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base"><code>GroupScan</code></a>.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getMinParallelizationWidth--">getMinParallelizationWidth</a></span>()</code>
<div class="block">At minimum, the GroupScan requires these many fragments to run.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getPartitionColumns--">getPartitionColumns</a></span>()</code>
<div class="block">Returns a list of columns that can be used for partition pruning</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/ScanStats.html" title="class in org.apache.drill.exec.physical.base">ScanStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getScanStats-org.apache.drill.exec.planner.physical.PlannerSettings-">getScanStats</a></span>(<a href="../../../../../../org/apache/drill/exec/planner/physical/PlannerSettings.html" title="class in org.apache.drill.exec.planner.physical">PlannerSettings</a>&nbsp;settings)</code>&nbsp;</td>
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<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/ScanStats.html" title="class in org.apache.drill.exec.physical.base">ScanStats</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getScanStats-org.apache.calcite.rel.metadata.RelMetadataQuery-">getScanStats</a></span>(org.apache.calcite.rel.metadata.RelMetadataQuery&nbsp;mq)</code>&nbsp;</td>
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<tr id="i18" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.fs.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getSelectionRoot--">getSelectionRoot</a></span>()</code>
<div class="block">Returns path to the selection root.</div>
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<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/physical/base/SubScan.html" title="interface in org.apache.drill.exec.physical.base">SubScan</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getSpecificScan-int-">getSpecificScan</a></span>(int&nbsp;minorFragmentId)</code>&nbsp;</td>
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<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadata.html" title="interface in org.apache.drill.metastore.metadata">TableMetadata</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getTableMetadata--">getTableMetadata</a></span>()</code>&nbsp;</td>
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<tr id="i21" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#hasFiles--">hasFiles</a></span>()</code>
<div class="block">Return true if this GroupScan can return its selection as a list of file names (retrieved by getFiles()).</div>
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<tr id="i22" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#isDistributed--">isDistributed</a></span>()</code>&nbsp;</td>
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<tr id="i23" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#supportsFilterPushDown--">supportsFilterPushDown</a></span>()</code>
<div class="block">Checks whether this group scan supports filter push down.</div>
</td>
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<tr id="i24" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#supportsLimitPushdown--">supportsLimitPushdown</a></span>()</code>
<div class="block">Whether or not this GroupScan supports limit pushdown</div>
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<tr id="i25" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#supportsPartitionFilterPushdown--">supportsPartitionFilterPushdown</a></span>()</code>
<div class="block">Whether or not this GroupScan supports pushdown of partition filters (directories for filesystems)</div>
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<tr id="i26" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#usedMetastore--">usedMetastore</a></span>()</code>
<div class="block">Returns <code>true</code> if current group scan uses metadata obtained from the Metastore.</div>
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<code><a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#accept-org.apache.drill.exec.physical.base.PhysicalVisitor-X-">accept</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getCost--">getCost</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getInitialAllocation--">getInitialAllocation</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getMaxAllocation--">getMaxAllocation</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getNewWithChildren-java.util.List-">getNewWithChildren</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getOperatorId--">getOperatorId</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getOperatorType--">getOperatorType</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getSVMode--">getSVMode</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#getUserName--">getUserName</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#isBufferedOperator-org.apache.drill.exec.ops.QueryContext-">isBufferedOperator</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#isExecutable--">isExecutable</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#setCost-org.apache.drill.exec.planner.cost.PrelCostEstimates-">setCost</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#setMaxAllocation-long-">setMaxAllocation</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/PhysicalOperator.html#setOperatorId-int-">setOperatorId</a></code></li>
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<code><a href="../../../../../../org/apache/drill/common/graph/GraphValue.html#accept-org.apache.drill.common.graph.GraphVisitor-">accept</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#iterator--" title="class or interface in java.lang">iterator</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li>
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<code><a href="../../../../../../org/apache/drill/exec/physical/base/HasAffinity.html#getDistributionAffinity--">getDistributionAffinity</a>, <a href="../../../../../../org/apache/drill/exec/physical/base/HasAffinity.html#getOperatorAffinity--">getOperatorAffinity</a></code></li>
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<h3>Field Detail</h3>
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<h4>ALL_COLUMNS</h4>
<pre>static final&nbsp;<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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt; ALL_COLUMNS</pre>
<div class="block">columns list in GroupScan : 1) empty_column is for skipAll query.
2) NULL is interpreted as ALL_COLUMNS.
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<pre>void&nbsp;applyAssignments(<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>&lt;<a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a>&gt;&nbsp;endpoints)
throws <a href="../../../../../../org/apache/drill/exec/physical/PhysicalOperatorSetupException.html" title="class in org.apache.drill.exec.physical">PhysicalOperatorSetupException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/drill/exec/physical/PhysicalOperatorSetupException.html" title="class in org.apache.drill.exec.physical">PhysicalOperatorSetupException</a></code></dd>
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<pre><a href="../../../../../../org/apache/drill/exec/physical/base/SubScan.html" title="interface in org.apache.drill.exec.physical.base">SubScan</a>&nbsp;getSpecificScan(int&nbsp;minorFragmentId)
throws <a href="../../../../../../org/apache/drill/common/exceptions/ExecutionSetupException.html" title="class in org.apache.drill.common.exceptions">ExecutionSetupException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../org/apache/drill/common/exceptions/ExecutionSetupException.html" title="class in org.apache.drill.common.exceptions">ExecutionSetupException</a></code></dd>
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<pre>int&nbsp;getMaxParallelizationWidth()</pre>
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<pre>int&nbsp;getMinParallelizationWidth()</pre>
<div class="block">At minimum, the GroupScan requires these many fragments to run.
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the minimum number of fragments that should run</dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
boolean&nbsp;enforceWidth()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use <a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html#getMinParallelizationWidth--"><code>getMinParallelizationWidth()</code></a> to determine whether this GroupScan spans more than one
fragment.</span></div>
<div class="block">Check if GroupScan enforces width to be maximum parallelization width.
Currently, this is used in <a href="../../../../../../org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.html" title="class in org.apache.drill.exec.planner.physical.visitor"><code>ExcessiveExchangeIdentifier</code></a></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>if maximum width should be enforced</dd>
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<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;getDigest()</pre>
<div class="block">Returns a signature of the <a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base"><code>GroupScan</code></a> which should usually be composed of
all its attributes which could describe it uniquely.</div>
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<pre><a href="../../../../../../org/apache/drill/exec/physical/base/ScanStats.html" title="class in org.apache.drill.exec.physical.base">ScanStats</a>&nbsp;getScanStats(<a href="../../../../../../org/apache/drill/exec/planner/physical/PlannerSettings.html" title="class in org.apache.drill.exec.planner.physical">PlannerSettings</a>&nbsp;settings)</pre>
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<pre><a href="../../../../../../org/apache/drill/exec/physical/base/ScanStats.html" title="class in org.apache.drill.exec.physical.base">ScanStats</a>&nbsp;getScanStats(org.apache.calcite.rel.metadata.RelMetadataQuery&nbsp;mq)</pre>
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<h4>clone</h4>
<pre><a href="../../../../../../org/apache/drill/exec/physical/base/GroupScan.html" title="interface in org.apache.drill.exec.physical.base">GroupScan</a>&nbsp;clone(<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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;&nbsp;columns)</pre>
<div class="block">Returns a clone of GroupScan instance, except that the new GroupScan will use the provided list of columns .</div>
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<div class="block">GroupScan should check the list of columns, and see if it could support all the columns in the list.</div>
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<pre>long&nbsp;getColumnValueCount(<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&nbsp;column)</pre>
<div class="block">Return the number of non-null value in the specified column. Raise exception, if groupscan does not
have exact column row count.</div>
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<pre>boolean&nbsp;supportsPartitionFilterPushdown()</pre>
<div class="block">Whether or not this GroupScan supports pushdown of partition filters (directories for filesystems)</div>
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<h4>getColumns</h4>
<pre><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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;&nbsp;getColumns()</pre>
<div class="block">Returns a list of columns scanned by this group scan</div>
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<pre><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>&lt;<a href="../../../../../../org/apache/drill/common/expression/SchemaPath.html" title="class in org.apache.drill.common.expression">SchemaPath</a>&gt;&nbsp;getPartitionColumns()</pre>
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<pre>boolean&nbsp;supportsLimitPushdown()</pre>
<div class="block">Whether or not this GroupScan supports limit pushdown</div>
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<div class="block">Apply rowcount based prune for "LIMIT n" query.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>maxRecords</code> - : the number of rows requested from group scan.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new instance of group scan if the prune is successful.
null when either if row-based prune is not supported, or if prune is not successful.</dd>
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<pre>boolean&nbsp;hasFiles()</pre>
<div class="block">Return true if this GroupScan can return its selection as a list of file names (retrieved by getFiles()).</div>
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<pre>org.apache.hadoop.fs.Path&nbsp;getSelectionRoot()</pre>
<div class="block">Returns path to the selection root. If this GroupScan cannot provide selection root, it returns null.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>path to the selection root</dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.fs.Path&gt;&nbsp;getFiles()</pre>
<div class="block">Returns a collection of file names associated with this GroupScan. This should be called after checking
hasFiles(). If this GroupScan cannot provide file names, it returns null.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>collection of files paths</dd>
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<pre><a href="../../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;getFilter()</pre>
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<pre><a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadataProvider.html" title="interface in org.apache.drill.metastore.metadata">TableMetadataProvider</a>&nbsp;getMetadataProvider()</pre>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd><a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadataProvider.html" title="interface in org.apache.drill.metastore.metadata"><code>TableMetadataProvider</code></a> instance the source of metadata</dd>
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<pre><a href="../../../../../../org/apache/drill/metastore/metadata/TableMetadata.html" title="interface in org.apache.drill.metastore.metadata">TableMetadata</a>&nbsp;getTableMetadata()</pre>
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<pre>boolean&nbsp;usedMetastore()</pre>
<div class="block">Returns <code>true</code> if current group scan uses metadata obtained from the Metastore.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if current group scan uses metadata obtained from the Metastore, <code>false</code> otherwise.</dd>
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<h4>getAnalyzeInfoProvider</h4>
<pre><a href="../../../../../../org/apache/drill/exec/metastore/analyze/AnalyzeInfoProvider.html" title="interface in org.apache.drill.exec.metastore.analyze">AnalyzeInfoProvider</a>&nbsp;getAnalyzeInfoProvider()</pre>
<div class="block">Returns <a href="../../../../../../org/apache/drill/exec/metastore/analyze/AnalyzeInfoProvider.html" title="interface in org.apache.drill.exec.metastore.analyze"><code>AnalyzeInfoProvider</code></a> instance which will be used when running ANALYZE statement.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><a href="../../../../../../org/apache/drill/exec/metastore/analyze/AnalyzeInfoProvider.html" title="interface in org.apache.drill.exec.metastore.analyze"><code>AnalyzeInfoProvider</code></a> instance</dd>
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<h4>supportsFilterPushDown</h4>
<pre>boolean&nbsp;supportsFilterPushDown()</pre>
<div class="block">Checks whether this group scan supports filter push down.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this group scan supports filter push down,
<code>false</code> otherwise</dd>
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