org.apache.flink.table.api

类 WatermarkSpec

java.lang.Object

org.apache.flink.table.api.WatermarkSpec

public class WatermarkSpec
extends Object

Watermark metadata defined in TableSchema. It mainly contains 3 parts:

1. the rowtime attribute.
2. the string representation of watermark generation expression.
3. the data type of the computation result of watermark generation expression.

构造器概要

构造器

构造器和说明
WatermarkSpec(String rowtimeAttribute, String watermarkExpressionString, DataType watermarkExprOutputType)

方法概要

限定符和类型	方法和说明
String	asSummaryString()
boolean	equals(Object o)
String	getRowtimeAttribute() Returns the name of rowtime attribute, it can be a nested field using dot separator.
String	getWatermarkExpr() Returns the string representation of watermark generation expression.
DataType	getWatermarkExprOutputType() Returns the data type of the computation result of watermark generation expression.
int	hashCode()
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

WatermarkSpec

public WatermarkSpec(String rowtimeAttribute,
                     String watermarkExpressionString,
                     DataType watermarkExprOutputType)

方法详细资料

getRowtimeAttribute

public String getRowtimeAttribute()

Returns the name of rowtime attribute, it can be a nested field using dot separator. The referenced attribute must be present in the TableSchema and of type LogicalTypeRoot.TIMESTAMP_WITHOUT_TIME_ZONE.

getWatermarkExpr

public String getWatermarkExpr()

Returns the string representation of watermark generation expression. The string representation is a qualified SQL expression string (UDFs are expanded).

getWatermarkExprOutputType

public DataType getWatermarkExprOutputType()

Returns the data type of the computation result of watermark generation expression.

asSummaryString

public String asSummaryString()

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