io.cdap.directives.column

Class FlattenRecord

java.lang.Object

io.cdap.directives.column.FlattenRecord

All Implemented Interfaces:

Directive, Executor<List<Row>,List<Row>>, Serializable

@Categories(categories="column")
public class FlattenRecord
extends Object
implements Directive

A directive for splitting a RowType ("Record") Column into multiple Columns. The directive takes multiple columns of type "Row" as brings all its elements up a level. Topmost elements will be set under new columns prefixed with the name of the parent column followed by an underscore. Existing columns with the same name will be replaced by the new values. E.G Input: | A | {B: 1, C: 2} Directive flatten-record :A Output: | A | A_B | A_C | {B: 1, C:2} | 1 | 2 |

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME

Fields inherited from interface io.cdap.wrangler.api.Directive

TYPE

Constructor Summary

Constructors

Constructor and Description
FlattenRecord()

Method Summary

Modifier and Type	Method and Description
UsageDefinition	define()
void	destroy()
List<Row>	execute(List<Row> rows, ExecutorContext context)
void	initialize(Arguments args)

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

FlattenRecord

public FlattenRecord()

Method Detail

define

public UsageDefinition define()

Specified by:

define in interface Directive

initialize

public void initialize(Arguments args)
                throws DirectiveParseException

Specified by:

initialize in interface Executor<List<Row>,List<Row>>

Throws:

DirectiveParseException

destroy

public void destroy()

Specified by:

destroy in interface Executor<List<Row>,List<Row>>

execute

public List<Row> execute(List<Row> rows,
                         ExecutorContext context)
                  throws DirectiveExecutionException

Specified by:

execute in interface Executor<List<Row>,List<Row>>

Throws:

DirectiveExecutionException