Package org.apache.drill.exec.store.ischema

Class InfoSchemaStoragePlugin

java.lang.Object

org.apache.drill.exec.store.AbstractStoragePlugin

org.apache.drill.exec.store.ischema.InfoSchemaStoragePlugin

All Implemented Interfaces:

AutoCloseable, SchemaFactory, StoragePlugin

public class InfoSchemaStoragePlugin
extends AbstractStoragePlugin

Field Summary

Fields inherited from class org.apache.drill.exec.store.AbstractStoragePlugin

context

Fields inherited from interface org.apache.drill.exec.store.SchemaFactory

DEFAULT_WS_NAME

Constructor Summary

Constructors

Constructor	Description
InfoSchemaStoragePlugin(DrillbitContext context)
InfoSchemaStoragePlugin(InfoSchemaConfig config, DrillbitContext context, String name)

Method Summary

Modifier and Type	Method	Description
StoragePluginConfig	getConfig()	Method returns a Jackson serializable object that extends a StoragePluginConfig.
Set<StoragePluginOptimizerRule>	getOptimizerRules(OptimizerRulesContext optimizerRulesContext, PlannerPhase phase)	An implementation of this method will return one or more specialized rules that Drill query optimizer can leverage in physical space.
InfoSchemaGroupScan	getPhysicalScan(String userName, JSONOptions selection, List<SchemaPath> columns)	Get the physical scan operator for the particular GroupScan (read) node.
void	registerSchemas(SchemaConfig schemaConfig, org.apache.calcite.schema.SchemaPlus parent)	Register the schemas provided by this SchemaFactory implementation under the given parent schema.
boolean	supportsRead()	Indicates if Drill can read the table from this format.

Methods inherited from class org.apache.drill.exec.store.AbstractStoragePlugin

close, getContext, getFormatPlugin, getName, getPhysicalScan, getPhysicalScan, getPhysicalScan, getPhysicalScan, getPhysicalScan, onDisabled, onEnabled, start, supportsInsert, supportsWrite, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

InfoSchemaStoragePlugin

public InfoSchemaStoragePlugin(DrillbitContext context)

InfoSchemaStoragePlugin

public InfoSchemaStoragePlugin(InfoSchemaConfig config,
 DrillbitContext context,
 String name)

Method Details

supportsRead

public boolean supportsRead()

Description copied from interface: StoragePlugin

Indicates if Drill can read the table from this format.

Specified by:

supportsRead in interface StoragePlugin

Overrides:

supportsRead in class AbstractStoragePlugin

getPhysicalScan

public InfoSchemaGroupScan getPhysicalScan(String userName,
 JSONOptions selection,
 List<SchemaPath> columns)

Description copied from interface: StoragePlugin

Get the physical scan operator for the particular GroupScan (read) node.

Specified by:

getPhysicalScan in interface StoragePlugin

Overrides:

getPhysicalScan in class AbstractStoragePlugin

Parameters:

userName - User whom to impersonate when reading the contents as part of Scan.

selection - The configured storage engine specific selection.

columns - (optional) The list of column names to scan from the data source.

Returns:

The physical scan operator for the particular GroupScan (read) node.

getConfig

public StoragePluginConfig getConfig()

Description copied from interface: StoragePlugin

Method returns a Jackson serializable object that extends a StoragePluginConfig.

Returns:

an extension of StoragePluginConfig

registerSchemas

public void registerSchemas(SchemaConfig schemaConfig,
 org.apache.calcite.schema.SchemaPlus parent)

Description copied from interface: SchemaFactory

Register the schemas provided by this SchemaFactory implementation under the given parent schema.

Parameters:

schemaConfig - Configuration for schema objects.

parent - Reference to parent schema.

getOptimizerRules

public Set<StoragePluginOptimizerRule> getOptimizerRules(OptimizerRulesContext optimizerRulesContext,
 PlannerPhase phase)

Description copied from interface: StoragePlugin

An implementation of this method will return one or more specialized rules that Drill query optimizer can leverage in physical space. Otherwise, it should return an empty set.

Returns:

an empty set or a set of plugin specific physical optimizer rules.