org.apache.flink.table.operations

Class ShowColumnsOperation

java.lang.Object

org.apache.flink.table.operations.ShowColumnsOperation

All Implemented Interfaces:

ExecutableOperation, Operation, ShowOperation

@Internal
public class ShowColumnsOperation
extends Object
implements ShowOperation

Show columns from [[catalog.]database.]table.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.table.operations.ExecutableOperation

ExecutableOperation.Context

Constructor Summary

Constructors

Constructor and Description
ShowColumnsOperation(org.apache.flink.table.catalog.ObjectIdentifier tableIdentifier, String likePattern, boolean useLike, boolean notLike, String preposition)

Method Summary

Modifier and Type	Method and Description
String	asSummaryString() Returns a string that summarizes this operation for printing to a console.
TableResultInternal	execute(ExecutableOperation.Context ctx) Executes the given operation and return the execution result.
String	getLikePattern()
String	getPreposition()
org.apache.flink.table.catalog.ObjectIdentifier	getTableIdentifier()
boolean	isNotLike()
boolean	isUseLike()

Methods inherited from class java.lang.Object

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

Constructor Detail

ShowColumnsOperation

public ShowColumnsOperation(org.apache.flink.table.catalog.ObjectIdentifier tableIdentifier,
                            @Nullable
                            String likePattern,
                            boolean useLike,
                            boolean notLike,
                            String preposition)

Method Detail

getLikePattern

public String getLikePattern()

getPreposition

public String getPreposition()

isUseLike

public boolean isUseLike()

isNotLike

public boolean isNotLike()

getTableIdentifier

public org.apache.flink.table.catalog.ObjectIdentifier getTableIdentifier()

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

execute

public TableResultInternal execute(ExecutableOperation.Context ctx)

Description copied from interface: ExecutableOperation

Executes the given operation and return the execution result.

Specified by:

execute in interface ExecutableOperation

Parameters:

ctx - the context to execute the operation.

Returns:

the content of the execution result.

See Also:

TableEnvironmentInternal.executeInternal(Operation)