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<org.apache.flink.table.expressions.ResolvedExpression> projectList, QueryOperation child, org.apache.flink.table.catalog.ResolvedSchema resolvedSchema)

Method Summary

Modifier and Type	Method	Description
<T> T	accept(QueryOperationVisitor<T> visitor)
String	asSerializableString(org.apache.flink.table.expressions.SqlFactory sqlFactory)	Returns a SQL string that fully serializes this instance.
String	asSummaryString()	Returns a string that summarizes this operation for printing to a console.
List<QueryOperation>	getChildren()
List<org.apache.flink.table.expressions.ResolvedExpression>	getProjectList()
org.apache.flink.table.catalog.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

Methods inherited from interface org.apache.flink.table.operations.QueryOperation

asSerializableString

Constructor Detail

ProjectQueryOperation

public ProjectQueryOperation(List<org.apache.flink.table.expressions.ResolvedExpression> projectList,
                             QueryOperation child,
                             org.apache.flink.table.catalog.ResolvedSchema resolvedSchema)

Method Detail

getProjectList

public List<org.apache.flink.table.expressions.ResolvedExpression> getProjectList()

getResolvedSchema

public org.apache.flink.table.catalog.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(org.apache.flink.table.expressions.SqlFactory sqlFactory)

Description copied from interface: QueryOperation

Returns a SQL 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

Parameters:

sqlFactory - can be used to customize the serialization to a SQL string

Returns:

Flink SQL string for persisting in a catalog

See Also:

Operation.asSummaryString(), EnvironmentSettings.Builder.withSqlFactory(SqlFactory)

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