Package org.apache.flink.table.operations

Class ShowDatabasesOperation

java.lang.Object

org.apache.flink.table.operations.AbstractShowOperation

org.apache.flink.table.operations.ShowDatabasesOperation

All Implemented Interfaces:

ExecutableOperation, Operation, ShowOperation

@Internal
public class ShowDatabasesOperation
extends AbstractShowOperation

Operation to describe a SHOW DATABASES statement. The full syntax for SHOW DATABASES is as followings:

 SHOW DATABASES [ ( FROM | IN ) catalog_name] [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ]
 

Nested Class Summary

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

ExecutableOperation.Context

Field Summary

Fields inherited from class org.apache.flink.table.operations.AbstractShowOperation

catalogName, likeOp, preposition

Constructor Summary

Constructors

Constructor	Description
ShowDatabasesOperation(String catalogName)
ShowDatabasesOperation(String catalogName, String preposition, ShowLikeOperator likeOp)
ShowDatabasesOperation(String catalogName, ShowLikeOperator likeOp)

Method Summary

Modifier and Type	Method	Description
protected String	getColumnName()
protected String	getOperationName()
protected Collection<String>	retrieveDataForTableResult(ExecutableOperation.Context ctx)

Methods inherited from class org.apache.flink.table.operations.AbstractShowOperation

asSummaryString, equals, execute, getPrepositionSummaryString, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ShowDatabasesOperation

public ShowDatabasesOperation(@Nullable
 String catalogName,
 @Nullable
 String preposition,
 @Nullable
 ShowLikeOperator likeOp)

ShowDatabasesOperation

public ShowDatabasesOperation(@Nullable
 String catalogName,
 @Nullable
 ShowLikeOperator likeOp)

ShowDatabasesOperation

public ShowDatabasesOperation(@Nullable
 String catalogName)

Method Details

retrieveDataForTableResult

protected Collection<String> retrieveDataForTableResult(ExecutableOperation.Context ctx)

Specified by:

retrieveDataForTableResult in class AbstractShowOperation

getOperationName

protected String getOperationName()

Specified by:

getOperationName in class AbstractShowOperation

getColumnName

protected String getColumnName()

Specified by:

getColumnName in class AbstractShowOperation