org.apache.flink.table.plan.stats

Class TableStats

java.lang.Object

org.apache.flink.table.plan.stats.TableStats

@PublicEvolving
public final class TableStats
extends Object

Table statistics.

Field Summary

Fields

Modifier and Type	Field and Description
static TableStats	UNKNOWN Unknown definition for table stats: Unknown rowCount is -1.

Constructor Summary

Constructors

Constructor and Description
TableStats(long rowCount)
TableStats(long rowCount, Map<String,ColumnStats> colStats)

Method Summary

Modifier and Type	Method and Description
TableStats	copy() Create a deep copy of "this" instance.
boolean	equals(Object o)
Map<String,ColumnStats>	getColumnStats()
long	getRowCount()
int	hashCode()
TableStats	merge(TableStats other, Set<String> partitionKeys) Merges two table stats.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN

public static final TableStats UNKNOWN

Unknown definition for table stats: Unknown rowCount is -1. Unknown colStats is not exist in map.

Constructor Detail

TableStats

public TableStats(long rowCount)

TableStats

public TableStats(long rowCount,
                  Map<String,ColumnStats> colStats)

Method Detail

getRowCount

public long getRowCount()

getColumnStats

public Map<String,ColumnStats> getColumnStats()

copy

public TableStats copy()

Create a deep copy of "this" instance.

Returns:

a deep copy

merge

public TableStats merge(TableStats other,
                        @Nullable
                        Set<String> partitionKeys)

Merges two table stats. When the stats are unknown, whatever the other are, we need return unknown stats. See UNKNOWN.

Parameters:

other - The other table stats to merge.

Returns:

The merged table stats.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object