org.apache.flink.api.java.summarize

类 ColumnSummary

java.lang.Object

org.apache.flink.api.java.summarize.ColumnSummary

直接已知子类:

BooleanColumnSummary, NumericColumnSummary, ObjectColumnSummary, StringColumnSummary

@PublicEvolving
public abstract class ColumnSummary
extends Object

Summary for a column of values.

构造器概要

构造器

构造器和说明
ColumnSummary()

方法概要

限定符和类型	方法和说明
boolean	containsNonNull() True if this column contains any non-null values.
boolean	containsNull() True if this column contains any null values.
abstract long	getNonNullCount() The number of non-null values in this column.
abstract long	getNullCount() The number of null values in this column.
long	getTotalCount() The number of all rows in this column including both nulls and non-nulls.

从类继承的方法 java.lang.Object

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

构造器详细资料

ColumnSummary

public ColumnSummary()

方法详细资料

getTotalCount

public long getTotalCount()

The number of all rows in this column including both nulls and non-nulls.

getNonNullCount

public abstract long getNonNullCount()

The number of non-null values in this column.

getNullCount

public abstract long getNullCount()

The number of null values in this column.

containsNull

public boolean containsNull()

True if this column contains any null values.

containsNonNull

public boolean containsNonNull()

True if this column contains any non-null values.