org.apache.flink.cdc.runtime.operators.transform

类 ProjectionColumn

java.lang.Object

org.apache.flink.cdc.runtime.operators.transform.ProjectionColumn

所有已实现的接口:

Serializable

public class ProjectionColumn
extends Object
implements Serializable

The ProjectionColumn applies to describe the information of the transformation column. If it only has column info, it describes the data column. If it has column info and expression info, it describes the user-defined computed columns.

A projection column contains:

• column: column information parsed from projection.
• expression: a string for column expression split from the user-defined projection.
• scriptExpression: a string for column script expression compiled from the column expression.
• originalColumnNames: a list for recording the name of all columns used by the column expression.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
ProjectionColumn(org.apache.flink.cdc.common.schema.Column column, String expression, String scriptExpression, List<String> originalColumnNames)

方法概要

限定符和类型	方法和说明
ProjectionColumn	copy()
org.apache.flink.cdc.common.schema.Column	getColumn()
String	getColumnName()
org.apache.flink.cdc.common.types.DataType	getDataType()
List<String>	getOriginalColumnNames()
String	getScriptExpression()
boolean	isValidTransformedProjectionColumn()
static ProjectionColumn	ofAliased(org.apache.flink.cdc.common.schema.Column column, String newName) This projection is created with a simple $id$ AS $new_id$ expression.
static ProjectionColumn	ofCalculated(String columnName, org.apache.flink.cdc.common.types.DataType dataType, String expression, String scriptExpression, List<String> originalColumnNames) This projection is created with a complex calculation expression.
static ProjectionColumn	ofForwarded(org.apache.flink.cdc.common.schema.Column column) This projection is created with a plain column name.
void	setTransformExpressionKey(TransformExpressionKey transformExpressionKey)
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

ProjectionColumn

public ProjectionColumn(org.apache.flink.cdc.common.schema.Column column,
                        String expression,
                        String scriptExpression,
                        List<String> originalColumnNames)

方法详细资料

copy

public ProjectionColumn copy()

getColumn

public org.apache.flink.cdc.common.schema.Column getColumn()

getColumnName

public String getColumnName()

getDataType

public org.apache.flink.cdc.common.types.DataType getDataType()

getScriptExpression

public String getScriptExpression()

getOriginalColumnNames

public List<String> getOriginalColumnNames()

setTransformExpressionKey

public void setTransformExpressionKey(TransformExpressionKey transformExpressionKey)

isValidTransformedProjectionColumn

public boolean isValidTransformedProjectionColumn()

ofForwarded

public static ProjectionColumn ofForwarded(org.apache.flink.cdc.common.schema.Column column)

This projection is created with a plain column name.
Just like column id in id, name AS new_name, age + 1 AS new_age.
Comments and default expressions will be intact.

ofAliased

public static ProjectionColumn ofAliased(org.apache.flink.cdc.common.schema.Column column,
                                         String newName)

This projection is created with a simple $id$ AS $new_id$ expression.
Just like column new_name in id, name AS new_name, age + 1 AS new_age.
Comments and default expressions will be intact.

ofCalculated

public static ProjectionColumn ofCalculated(String columnName,
                                            org.apache.flink.cdc.common.types.DataType dataType,
                                            String expression,
                                            String scriptExpression,
                                            List<String> originalColumnNames)

This projection is created with a complex calculation expression.
Just like column new_age in id, name AS new_name, age + 1 AS new_age.
No comments nor default expressions will be kept.

toString

public String toString()

覆盖:

toString 在类中 Object