org.apache.drill.exec.util

Class Utilities

java.lang.Object

org.apache.drill.exec.util.Utilities

public class Utilities
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static String	COL_NULL_ERROR

Constructor Summary

Constructors

Constructor and Description
Utilities()

Method Summary

Modifier and Type	Method and Description
static PathSegment	convertLiteral(org.apache.calcite.rex.RexLiteral literal) Converts literal into path segment based on its type.
static BitControl.QueryContextInformation	createQueryContextInfo(String defaultSchemaName, String sessionId) Create BitControl.QueryContextInformation with given defaultSchemaName.
static DrillTable	getDrillTable(org.apache.calcite.plan.RelOptTable table) Gets DrillTable, either wrapped in RelOptTable, or DrillTranslatableTable.
static String	getDrillVersion() Read the manifest file and get the Drill version number
static String	getFileNameForQueryFragment(FragmentContext context, String location, String tag)
static boolean	isStarQuery(Collection<SchemaPath> projected) Return true if list of schema path has star column.
static boolean	isStarQuery(org.apache.calcite.rel.type.RelDataType projected) Return true if the row type has star column.
static org.apache.calcite.rel.metadata.JaninoRelMetadataProvider	registerJaninoRelMetadataProvider()

Methods inherited from class java.lang.Object

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

Field Detail

COL_NULL_ERROR

public static final String COL_NULL_ERROR

See Also:

Constant Field Values

Constructor Detail

Utilities

public Utilities()

Method Detail

getFileNameForQueryFragment

public static String getFileNameForQueryFragment(FragmentContext context,
                                                 String location,
                                                 String tag)

createQueryContextInfo

public static BitControl.QueryContextInformation createQueryContextInfo(String defaultSchemaName,
                                                                        String sessionId)

Create BitControl.QueryContextInformation with given defaultSchemaName. Rest of the members of the QueryContextInformation is derived from the current state of the process.

Returns:

A BitControl.QueryContextInformation with given defaultSchemaName.

getDrillVersion

public static String getDrillVersion()

Read the manifest file and get the Drill version number

Returns:

The Drill version.

isStarQuery

public static boolean isStarQuery(Collection<SchemaPath> projected)

Return true if list of schema path has star column.

Returns:

True if the list of SchemaPaths has star column.

isStarQuery

public static boolean isStarQuery(org.apache.calcite.rel.type.RelDataType projected)

Return true if the row type has star column.

getDrillTable

public static DrillTable getDrillTable(org.apache.calcite.plan.RelOptTable table)

Gets DrillTable, either wrapped in RelOptTable, or DrillTranslatableTable.

Parameters:

table - table instance

Returns:

Drill table

convertLiteral

public static PathSegment convertLiteral(org.apache.calcite.rex.RexLiteral literal)

Converts literal into path segment based on its type. For unsupported types, returns null.

Parameters:

literal - literal

Returns:

new path segment, null otherwise

registerJaninoRelMetadataProvider

public static org.apache.calcite.rel.metadata.JaninoRelMetadataProvider registerJaninoRelMetadataProvider()