org.apache.drill.metastore.statistics

Class TableStatisticsKind<T>

java.lang.Object

org.apache.drill.metastore.statistics.BaseStatisticsKind<T>

org.apache.drill.metastore.statistics.TableStatisticsKind<T>

All Implemented Interfaces:

CollectableTableStatisticsKind<T>, StatisticsKind<T>

public class TableStatisticsKind<T>
extends BaseStatisticsKind<T>
implements CollectableTableStatisticsKind<T>

Implementation of CollectableColumnStatisticsKind which contain base table statistics kinds with implemented mergeStatistics() method.

Field Summary

Fields

Modifier and Type	Field and Description
static TableStatisticsKind<MetadataType>	ANALYZE_METADATA_LEVEL Table statistics kind which represents metadata level for which analyze was produced.
static TableStatisticsKind<Double>	EST_ROW_COUNT Table statistics kind which represents estimated row count for the specific table.
static TableStatisticsKind<Boolean>	HAS_DESCRIPTIVE_STATISTICS Table statistics kind which represents estimated row count for the specific table.
static TableStatisticsKind<Long>	ROW_COUNT Table statistics kind which represents row count for the specific table.

Fields inherited from class org.apache.drill.metastore.statistics.BaseStatisticsKind

exact, statisticKey

Constructor Summary

Constructors

Constructor and Description
TableStatisticsKind(String statisticKey, boolean exact)

Method Summary

Modifier and Type	Method and Description
T	getValue(Metadata metadata) Returns value which corresponds to this statistic kind, obtained from specified Metadata.
T	mergeStatistics(Collection<? extends Metadata> statistics) Returns table statistics value received by collecting specified ColumnStatistics.

Methods inherited from class org.apache.drill.metastore.statistics.BaseStatisticsKind

equals, getName, hashCode, isExact, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.metastore.statistics.StatisticsKind

getName, isExact

Field Detail

ROW_COUNT

public static final TableStatisticsKind<Long> ROW_COUNT

Table statistics kind which represents row count for the specific table.

EST_ROW_COUNT

public static final TableStatisticsKind<Double> EST_ROW_COUNT

Table statistics kind which represents estimated row count for the specific table.

HAS_DESCRIPTIVE_STATISTICS

public static final TableStatisticsKind<Boolean> HAS_DESCRIPTIVE_STATISTICS

Table statistics kind which represents estimated row count for the specific table.

ANALYZE_METADATA_LEVEL

public static final TableStatisticsKind<MetadataType> ANALYZE_METADATA_LEVEL

Table statistics kind which represents metadata level for which analyze was produced.

Constructor Detail

TableStatisticsKind

public TableStatisticsKind(String statisticKey,
                           boolean exact)

Method Detail

mergeStatistics

public T mergeStatistics(Collection<? extends Metadata> statistics)

Description copied from interface: CollectableTableStatisticsKind

Returns table statistics value received by collecting specified ColumnStatistics.

Specified by:

mergeStatistics in interface CollectableTableStatisticsKind<T>

Parameters:

statistics - list of ColumnStatistics instances to be collected

Returns:

column statistics value received by collecting specified ColumnStatistics

getValue

public T getValue(Metadata metadata)

Returns value which corresponds to this statistic kind, obtained from specified Metadata.

Parameters:

metadata - the source of statistic value

Returns:

value which corresponds to this statistic kind