Package org.apache.drill.exec.store.http

Class HttpGroupScan

java.lang.Object

org.apache.drill.exec.physical.base.AbstractBase

org.apache.drill.exec.physical.base.AbstractGroupScan

org.apache.drill.exec.store.http.HttpGroupScan

All Implemented Interfaces:

Iterable<PhysicalOperator>, GraphValue<PhysicalOperator>, FragmentLeaf, GroupScan, HasAffinity, Leaf, PhysicalOperator, Scan

public class HttpGroupScan
extends AbstractGroupScan

Field Summary

Fields inherited from class org.apache.drill.exec.physical.base.AbstractBase

INIT_ALLOCATION, initialAllocation, MAX_ALLOCATION, maxAllocation, userName

Fields inherited from interface org.apache.drill.exec.physical.base.GroupScan

ALL_COLUMNS

Constructor Summary

Constructors

Constructor	Description
HttpGroupScan(List<SchemaPath> columns, HttpScanSpec httpScanSpec, Map<String,String> filters, double selectivity, int maxRecords)	Deserialize a group scan.
HttpGroupScan(HttpGroupScan that)	Copies the group scan during many stages of Calcite operation.
HttpGroupScan(HttpGroupScan that, int maxRecords)	Adds a limit to the scan.
HttpGroupScan(HttpGroupScan that, List<SchemaPath> columns)	Applies columns.
HttpGroupScan(HttpGroupScan that, Map<String,String> filters, double filterSelectivity)	Adds a filter to the scan.
HttpGroupScan(HttpScanSpec scanSpec, MetadataProviderManager metadataProviderManager)	Creates a new group scan from the storage plugin.

Method Summary

Modifier and Type	Method	Description
boolean	allowsFilters()
void	applyAssignments(List<CoordinationProtos.DrillbitEndpoint> endpoints)
GroupScan	applyLimit(int maxRecords)	By default, return null to indicate row count based prune is not supported.
boolean	canPushdownProjects(List<SchemaPath> columns)	GroupScan should check the list of columns, and see if it could support all the columns in the list.
GroupScan	clone(List<SchemaPath> columns)	Returns a clone of GroupScan instance, except that the new GroupScan will use the provided list of columns .
List<SchemaPath>	columns()
boolean	equals(Object obj)
Map<String,String>	filters()
String	getDigest()	Returns a signature of the GroupScan which should usually be composed of all its attributes which could describe it uniquely.
HttpApiConfig	getHttpConfig()
int	getMaxParallelizationWidth()
TableMetadataProvider	getMetadataProvider()	Returns TableMetadataProvider instance which is used for providing metadata for current GroupScan.
PhysicalOperator	getNewWithChildren(List<PhysicalOperator> children)	Regenerate with this node with a new set of children.
ScanStats	getScanStats()
TupleMetadata	getSchema()
SubScan	getSpecificScan(int minorFragmentId)
TableMetadata	getTableMetadata()
boolean	hasFilters()
int	hashCode()
HttpScanSpec	httpScanSpec()
int	maxRecords()
double	selectivity()
boolean	supportsLimitPushdown()	Default is not to support limit pushdown.
String	toString()

Methods inherited from class org.apache.drill.exec.physical.base.AbstractGroupScan

accept, applyFilter, enforceWidth, getAnalyzeInfoProvider, getColumns, getColumnValueCount, getDistributionAffinity, getFiles, getFilter, getInitialAllocation, getMaxAllocation, getMinParallelizationWidth, getOperatorAffinity, getOperatorType, getPartitionColumns, getScanStats, getScanStats, getSelectionRoot, hasFiles, isDistributed, isExecutable, iterator, supportsFilterPushDown, supportsPartitionFilterPushdown, usedMetastore

Methods inherited from class org.apache.drill.exec.physical.base.AbstractBase

accept, getCost, getOperatorId, getSVMode, getUserName, isBufferedOperator, setCost, setMaxAllocation, setOperatorId

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.drill.common.graph.GraphValue

accept

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.apache.drill.exec.physical.base.PhysicalOperator

getCost, getOperatorId, getSVMode, getUserName, isBufferedOperator, setCost, setMaxAllocation, setOperatorId

Constructor Details

HttpGroupScan

public HttpGroupScan(HttpScanSpec scanSpec,
 MetadataProviderManager metadataProviderManager)

Creates a new group scan from the storage plugin.

HttpGroupScan

public HttpGroupScan(HttpGroupScan that)

Copies the group scan during many stages of Calcite operation.

HttpGroupScan

public HttpGroupScan(HttpGroupScan that,
 List<SchemaPath> columns)

Applies columns. Oddly called multiple times, even when the scan already has columns.

HttpGroupScan

public HttpGroupScan(HttpGroupScan that,
 Map<String,String> filters,
 double filterSelectivity)

Adds a filter to the scan.

HttpGroupScan

public HttpGroupScan(HttpGroupScan that,
 int maxRecords)

Adds a limit to the scan.

HttpGroupScan

public HttpGroupScan(List<SchemaPath> columns,
 HttpScanSpec httpScanSpec,
 Map<String,String> filters,
 double selectivity,
 int maxRecords)

Deserialize a group scan. Not called in normal operation. Probably used only if Drill executes a logical plan.

Method Details

columns

public List<SchemaPath> columns()

httpScanSpec

public HttpScanSpec httpScanSpec()

filters

public Map<String,String> filters()

selectivity

public double selectivity()

applyAssignments

public void applyAssignments(List<CoordinationProtos.DrillbitEndpoint> endpoints)

getMaxParallelizationWidth

public int getMaxParallelizationWidth()

canPushdownProjects

public boolean canPushdownProjects(List<SchemaPath> columns)

Description copied from interface: GroupScan

GroupScan should check the list of columns, and see if it could support all the columns in the list.

Specified by:

canPushdownProjects in interface GroupScan

Overrides:

canPushdownProjects in class AbstractGroupScan

getHttpConfig

public HttpApiConfig getHttpConfig()

getSpecificScan

public SubScan getSpecificScan(int minorFragmentId)

clone

public GroupScan clone(List<SchemaPath> columns)

Description copied from interface: GroupScan

Returns a clone of GroupScan instance, except that the new GroupScan will use the provided list of columns .

Specified by:

clone in interface GroupScan

Overrides:

clone in class AbstractGroupScan

getDigest

public String getDigest()

Description copied from interface: GroupScan

Returns a signature of the GroupScan which should usually be composed of all its attributes which could describe it uniquely.

maxRecords

public int maxRecords()

getNewWithChildren

public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children)

Description copied from interface: PhysicalOperator

Regenerate with this node with a new set of children. This is used in the case of materialization or optimization.

Parameters:

children -

getSchema

public TupleMetadata getSchema()

getTableMetadata

public TableMetadata getTableMetadata()

Specified by:

getTableMetadata in interface GroupScan

Overrides:

getTableMetadata in class AbstractGroupScan

getMetadataProvider

public TableMetadataProvider getMetadataProvider()

Description copied from interface: GroupScan

Returns TableMetadataProvider instance which is used for providing metadata for current GroupScan.

Specified by:

getMetadataProvider in interface GroupScan

Overrides:

getMetadataProvider in class AbstractGroupScan

Returns:

TableMetadataProvider instance the source of metadata

getScanStats

public ScanStats getScanStats()

Overrides:

getScanStats in class AbstractGroupScan

hasFilters

public boolean hasFilters()

supportsLimitPushdown

public boolean supportsLimitPushdown()

Description copied from class: AbstractGroupScan

Default is not to support limit pushdown.

Specified by:

supportsLimitPushdown in interface GroupScan

Overrides:

supportsLimitPushdown in class AbstractGroupScan

applyLimit

public GroupScan applyLimit(int maxRecords)

Description copied from class: AbstractGroupScan

By default, return null to indicate row count based prune is not supported. Each group scan subclass should override, if it supports row count based prune.

Specified by:

applyLimit in interface GroupScan

Overrides:

applyLimit in class AbstractGroupScan

Parameters:

maxRecords - : the number of rows requested from group scan.

Returns:

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.

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

allowsFilters

public boolean allowsFilters()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object