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

Class ProjectionColumn

java.lang.Object

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

All Implemented Interfaces:

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.

See Also:

Serialized Form

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
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	of(String columnName, org.apache.flink.cdc.common.types.DataType dataType)
static ProjectionColumn	of(String columnName, org.apache.flink.cdc.common.types.DataType dataType, String expression, String scriptExpression, List<String> originalColumnNames)
void	setTransformExpressionKey(TransformExpressionKey transformExpressionKey)

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectionColumn

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

Method Detail

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()

of

public static ProjectionColumn of(String columnName,
                                  org.apache.flink.cdc.common.types.DataType dataType)

of

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