org.apache.drill.exec.store.sys

Class SystemTablePlugin

java.lang.Object

org.apache.drill.exec.store.AbstractStoragePlugin

org.apache.drill.exec.store.sys.SystemTablePlugin

All Implemented Interfaces:

AutoCloseable, SchemaFactory, StoragePlugin

public class SystemTablePlugin
extends AbstractStoragePlugin

A "storage" plugin for system tables.

Field Summary

Fields

Modifier and Type	Field and Description
static String	SYS_SCHEMA_NAME

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

logger

Constructor Summary

Constructors

Constructor and Description
SystemTablePlugin(SystemTablePluginConfig config, DrillbitContext context, String name)

Method Summary

Methods

Modifier and Type	Method and Description
StoragePluginConfig	getConfig() Method returns a Jackson serializable object that extends a StoragePluginConfig
DrillbitContext	getContext()
AbstractGroupScan	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.

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

close, getLogicalOptimizerRules, getOptimizerRules, getOptimizerRules, getPhysicalOptimizerRules, getPhysicalScan, start, supportsRead, supportsWrite

Methods inherited from class java.lang.Object

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

Field Detail

SYS_SCHEMA_NAME

public static final String SYS_SCHEMA_NAME

See Also:

Constant Field Values

Constructor Detail

SystemTablePlugin

public SystemTablePlugin(SystemTablePluginConfig config,
                 DrillbitContext context,
                 String name)

Method Detail

getConfig

public StoragePluginConfig getConfig()

Description copied from interface: StoragePlugin

Method returns a Jackson serializable object that extends a StoragePluginConfig

Returns:

an extension of StoragePluginConfig

getContext

public DrillbitContext getContext()

registerSchemas

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

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.

Throws:

IOException

getPhysicalScan

public AbstractGroupScan getPhysicalScan(String userName,
                                JSONOptions selection,
                                List<SchemaPath> columns)
                                  throws IOException

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 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:

Throws:

IOException