Package org.apache.flink.table.operations

Class ProjectQueryOperation

java.lang.Object

org.apache.flink.table.operations.ProjectQueryOperation

All Implemented Interfaces:

Operation, QueryOperation

@Internal
public class ProjectQueryOperation
extends Object
implements QueryOperation

Table operation that computes new table using given Expressions from its input relational operation.

Constructor Summary

Constructors

Constructor	Description
ProjectQueryOperation(List<ResolvedExpression> projectList, QueryOperation child, ResolvedSchema resolvedSchema)

Method Summary

Modifier and Type	Method	Description
<T> T	accept(QueryOperationVisitor<T> visitor)
String	asSerializableString()	Returns a string that fully serializes this instance.
String	asSummaryString()	Returns a string that summarizes this operation for printing to a console.
List<QueryOperation>	getChildren()
List<ResolvedExpression>	getProjectList()
ResolvedSchema	getResolvedSchema()	Resolved schema of this operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectQueryOperation

public ProjectQueryOperation(List<ResolvedExpression> projectList,
                             QueryOperation child,
                             ResolvedSchema resolvedSchema)

Method Detail

getProjectList

public List<ResolvedExpression> getProjectList()

getResolvedSchema

public ResolvedSchema getResolvedSchema()

Description copied from interface: QueryOperation

Resolved schema of this operation.

Specified by:

getResolvedSchema in interface QueryOperation

asSummaryString

public String asSummaryString()

Description copied from interface: Operation

Returns a string that summarizes this operation for printing to a console. An implementation might skip very specific properties.

Specified by:

asSummaryString in interface Operation

Returns:

summary string of this operation for debugging purposes

asSerializableString

public String asSerializableString()

Description copied from interface: QueryOperation

Returns a string that fully serializes this instance. The serialized string can be used for storing the query in e.g. a Catalog as a view.

Specified by:

asSerializableString in interface QueryOperation

Returns:

detailed string for persisting in a catalog

See Also:

Operation.asSummaryString()

getChildren

public List<QueryOperation> getChildren()

Specified by:

getChildren in interface QueryOperation

accept

public <T> T accept(QueryOperationVisitor<T> visitor)

Specified by:

accept in interface QueryOperation