Package org.apache.drill.metastore.metadata

Class MetadataInfo

java.lang.Object

org.apache.drill.metastore.metadata.MetadataInfo

public class MetadataInfo
extends Object

Class that specifies metadata type and metadata information which will be used for obtaining specific metadata from metastore. For example:

For table metadata: MetadataInfo[MetadataType.TABLE, MetadataInfo.GENERAL_INFO_KEY, MetadataInfo.GENERAL_INFO_KEY]

For default segment metadata: MetadataInfo[MetadataType.SEGMENT, MetadataInfo.DEFAULT_SEGMENT_KEY, MetadataInfo.DEFAULT_SEGMENT_KEY]

For top-level segment metadata: MetadataInfo[MetadataType.SEGMENT, "1994", "1994"]

For nested segment metadata: MetadataInfo[MetadataType.SEGMENT, "1994", "1994/Q1"]

For file metadata: MetadataInfo[MetadataType.FILE, "1994", "1994/Q1/0_0_0.parquet"]

For row group metadata: MetadataInfo[MetadataType.ROW_GROUP, "1994", "1994/Q1/0_0_0.parquet/1"]

For partition metadata: MetadataInfo[MetadataType.PARTITION, "1994", "1994/Q1/01"]

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MetadataInfo.MetadataInfoBuilder

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_COLUMN_PREFIX
static final String	DEFAULT_SEGMENT_KEY
static final String	GENERAL_INFO_KEY

Method Summary

Modifier and Type	Method	Description
static MetadataInfo.MetadataInfoBuilder	builder()
boolean	equals(Object o)
int	hashCode()
String	identifier()
String	key()
void	toMetadataUnitBuilder(TableMetadataUnit.Builder builder)
String	toString()
MetadataType	type()

Methods inherited from class java.lang.Object

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

Field Details

GENERAL_INFO_KEY

public static final String GENERAL_INFO_KEY

See Also:

• Constant Field Values

DEFAULT_SEGMENT_KEY

public static final String DEFAULT_SEGMENT_KEY

See Also:

• Constant Field Values

DEFAULT_COLUMN_PREFIX

public static final String DEFAULT_COLUMN_PREFIX

See Also:

• Constant Field Values

Method Details

type

public MetadataType type()

key

public String key()

identifier

public String identifier()

toMetadataUnitBuilder

public void toMetadataUnitBuilder(TableMetadataUnit.Builder builder)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

builder

public static MetadataInfo.MetadataInfoBuilder builder()