org.apache.flink.table.plan.stats

类 TableStats

java.lang.Object

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

@PublicEvolving
public final class TableStats
extends Object

Table statistics.

字段概要

字段

限定符和类型	字段和说明
static TableStats	UNKNOWN Unknown definition for table stats: Unknown rowCount is -1.

构造器概要

构造器

构造器和说明
TableStats(long rowCount)
TableStats(long rowCount, Map<String,ColumnStats> colStats)

方法概要

限定符和类型	方法和说明
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) Merges two table stats.
String	toString()

从类继承的方法 java.lang.Object

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

字段详细资料

UNKNOWN

public static final TableStats UNKNOWN

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

构造器详细资料

TableStats

public TableStats(long rowCount)

TableStats

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

方法详细资料

getRowCount

public long getRowCount()

getColumnStats

public Map<String,ColumnStats> getColumnStats()

copy

public TableStats copy()

Create a deep copy of "this" instance.

返回:

a deep copy

merge

@Nonnull
public TableStats merge(TableStats other)

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

参数:

other - The other table stats to merge.

返回:

The merged table stats.

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object