org.apache.drill.metastore.metadata

Enum MetadataType

java.lang.Object

java.lang.Enum<MetadataType>

org.apache.drill.metastore.metadata.MetadataType

All Implemented Interfaces:

Serializable, Comparable<MetadataType>

public enum MetadataType
extends Enum<MetadataType>

Enum with possible types of metadata.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALL Metadata that can be applicable to any type.
FILE File level metadata type.
NONE Metadata type which helps to indicate that there is no overflow of metadata.
PARTITION Drill partition level metadata type.
ROW_GROUP Row group level metadata type.
SEGMENT Segment level metadata type.
TABLE Table level metadata type.
VIEW Metadata type which belongs to views.

Method Summary

Modifier and Type	Method and Description
static MetadataType	fromValue(String value) Converts metadata type string representation into MetadataType instance.
boolean	includes(MetadataType metadataType) Checks whether this MetadataType includes the specified one.
static MetadataType	valueOf(String name) Returns the enum constant of this type with the specified name.
static MetadataType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NONE

public static final MetadataType NONE

Metadata type which helps to indicate that there is no overflow of metadata.

TABLE

public static final MetadataType TABLE

Table level metadata type.

SEGMENT

public static final MetadataType SEGMENT

Segment level metadata type. It corresponds to the metadata within specific directory for FS tables, or may correspond to partition for hive tables.

PARTITION

public static final MetadataType PARTITION

Drill partition level metadata type. It corresponds to parts of table data which has the same values within specific column, i.e. partitions discovered by Drill.

FILE

public static final MetadataType FILE

File level metadata type.

ROW_GROUP

public static final MetadataType ROW_GROUP

Row group level metadata type. Used for parquet tables.

ALL

public static final MetadataType ALL

Metadata that can be applicable to any type.

VIEW

public static final MetadataType VIEW

Metadata type which belongs to views.

Method Detail

values

public static MetadataType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (MetadataType c : MetadataType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static MetadataType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

includes

public boolean includes(MetadataType metadataType)

Checks whether this MetadataType includes the specified one. For example, SEGMENT metadata type includes TABLE metadata type.

Parameters:

metadataType - metadata type to check

Returns:

true if this MetadataType includes the specified one, false otherwise.

fromValue

public static MetadataType fromValue(String value)

Converts metadata type string representation into MetadataType instance.

Parameters:

value - metadata

Returns:

metadata type instance, null otherwise