org.apache.drill.metastore.metadata

Class BaseMetadata

java.lang.Object

org.apache.drill.metastore.metadata.BaseMetadata

All Implemented Interfaces:

Metadata

Direct Known Subclasses:

BaseTableMetadata, FileMetadata, PartitionMetadata, RowGroupMetadata, SegmentMetadata

public abstract class BaseMetadata
extends Object
implements Metadata

Common provider of tuple schema, column metadata, and statistics for table, partition, file or row group.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BaseMetadata.BaseMetadataBuilder<T extends BaseMetadata.BaseMetadataBuilder<T>>

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<SchemaPath,ColumnStatistics<?>>	columnsStatistics
protected long	lastModifiedTime
protected MetadataInfo	metadataInfo
protected Map<String,StatisticsHolder<?>>	metadataStatistics
protected TupleMetadata	schema
protected TableInfo	tableInfo
static long	UNDEFINED_TIME

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseMetadata(BaseMetadata.BaseMetadataBuilder<T> builder)

Method Summary

Modifier and Type	Method and Description
boolean	containsExactStatistics(StatisticsKind<?> statisticsKind) Checks whether specified statistics kind is set in this non-column statistics and it corresponds to the exact statistics value.
boolean	equals(Object o)
ColumnMetadata	getColumn(SchemaPath name) Returns metadata description for the specified column
Map<SchemaPath,ColumnStatistics<?>>	getColumnsStatistics() Returns statistics stored in current metadata represented as Map of column SchemaPaths and corresponding ColumnStatistics.
ColumnStatistics<?>	getColumnStatistics(SchemaPath columnName) Returns statistics for specified column stored in current metadata.
long	getLastModifiedTime() Allows to check the time, when any files were modified.
MetadataInfo	getMetadataInfo()
TupleMetadata	getSchema() Returns schema stored in current metadata represented as TupleMetadata.
<V> V	getStatistic(StatisticsKind<V> statisticsKind) Returns value of non-column statistics which corresponds to specified StatisticsKind.
<V> V	getStatisticsForColumn(SchemaPath columnName, StatisticsKind<V> statisticsKind) Returns value of column statistics which corresponds to specified StatisticsKind for column with specified columnName.
TableInfo	getTableInfo()
int	hashCode()
protected abstract BaseMetadata.BaseMetadataBuilder<?>	toBuilder()
TableMetadataUnit	toMetadataUnit() Converts Metadata implementation into TableMetadataUnit instance which will be used to write data into Drill Metastore Tables.
protected abstract void	toMetadataUnitBuilder(TableMetadataUnit.Builder builder)

Methods inherited from class java.lang.Object

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

Field Detail

UNDEFINED_TIME

public static final long UNDEFINED_TIME

See Also:

Constant Field Values

tableInfo

protected final TableInfo tableInfo

metadataInfo

protected final MetadataInfo metadataInfo

schema

protected final TupleMetadata schema

columnsStatistics

protected final Map<SchemaPath,ColumnStatistics<?>> columnsStatistics

metadataStatistics

protected final Map<String,StatisticsHolder<?>> metadataStatistics

lastModifiedTime

protected final long lastModifiedTime

Constructor Detail

BaseMetadata

protected BaseMetadata(BaseMetadata.BaseMetadataBuilder<T> builder)

Method Detail

getColumnsStatistics

public Map<SchemaPath,ColumnStatistics<?>> getColumnsStatistics()

Description copied from interface: Metadata

Returns statistics stored in current metadata represented as Map of column SchemaPaths and corresponding ColumnStatistics.

Specified by:

getColumnsStatistics in interface Metadata

Returns:

statistics stored in current metadata

getColumnStatistics

public ColumnStatistics<?> getColumnStatistics(SchemaPath columnName)

Description copied from interface: Metadata

Returns statistics for specified column stored in current metadata.

Specified by:

getColumnStatistics in interface Metadata

Parameters:

columnName - column whose statistics should be returned

Returns:

statistics for specified column

getSchema

public TupleMetadata getSchema()

Description copied from interface: Metadata

Returns schema stored in current metadata represented as TupleMetadata.

Specified by:

getSchema in interface Metadata

Returns:

schema stored in current metadata

getStatistic

public <V> V getStatistic(StatisticsKind<V> statisticsKind)

Description copied from interface: Metadata

Returns value of non-column statistics which corresponds to specified StatisticsKind.

Specified by:

getStatistic in interface Metadata

Parameters:

statisticsKind - statistics kind whose value should be returned

Returns:

value of non-column statistics

containsExactStatistics

public boolean containsExactStatistics(StatisticsKind<?> statisticsKind)

Description copied from interface: Metadata

Checks whether specified statistics kind is set in this non-column statistics and it corresponds to the exact statistics value.

Specified by:

containsExactStatistics in interface Metadata

Parameters:

statisticsKind - statistics kind to check

Returns:

true if value which corresponds to the specified statistics kind is exact

getStatisticsForColumn

public <V> V getStatisticsForColumn(SchemaPath columnName,
                                    StatisticsKind<V> statisticsKind)

Description copied from interface: Metadata

Returns value of column statistics which corresponds to specified StatisticsKind for column with specified columnName.

Specified by:

getStatisticsForColumn in interface Metadata

Parameters:

columnName - name of the column

statisticsKind - statistics kind whose value should be returned

Returns:

value of column statistics

getColumn

public ColumnMetadata getColumn(SchemaPath name)

Description copied from interface: Metadata

Returns metadata description for the specified column

Specified by:

getColumn in interface Metadata

Parameters:

name - column name, whose metadata type info should be returned

Returns:

ColumnMetadata schema description of the column

getTableInfo

public TableInfo getTableInfo()

Specified by:

getTableInfo in interface Metadata

getMetadataInfo

public MetadataInfo getMetadataInfo()

Specified by:

getMetadataInfo in interface Metadata

getLastModifiedTime

public long getLastModifiedTime()

Allows to check the time, when any files were modified. It is in Unix Timestamp, unit of measurement is millisecond. Undefined time value will be indicated using UNDEFINED_TIME value.

Returns:

last modified time of files

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toMetadataUnit

public TableMetadataUnit toMetadataUnit()

Description copied from interface: Metadata

Converts Metadata implementation into TableMetadataUnit instance which will be used to write data into Drill Metastore Tables.

Specified by:

toMetadataUnit in interface Metadata

Returns:

metadata unit instance

toMetadataUnitBuilder

protected abstract void toMetadataUnitBuilder(TableMetadataUnit.Builder builder)

toBuilder

protected abstract BaseMetadata.BaseMetadataBuilder<?> toBuilder()