DummyRowDecoder (presto-record-decoder 334 API)

java.lang.Object
- io.prestosql.decoder.dummy.DummyRowDecoder

All Implemented Interfaces:

RowDecoder
```
public class DummyRowDecoder
extends java.lang.Object
implements RowDecoder
```
The row decoder for the 'dummy' format. For an unstructured row format (bag of bytes), a specific decoder for a topic must exist. To start developing such a decoder, it is beneficial to be able to configure an arbitrary topic to be available through presto without any decoding at all (not even line parsing) and examine the internal rows that are exposed by Presto. By adding a table name to the catalog configuration file and not having and specific topic description JSON file (or by omitting the 'dataFormat' field in the table description file), this decoder should be selected by the appropriate connector.

Field Summary

Fields
Modifier and Type Field Description

static java.lang.String NAME

Constructor Summary

Constructors
Constructor Description

DummyRowDecoder()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Optional<java.util.Map<DecoderColumnHandle,FieldValueProvider>>`	`decodeRow(byte[] data, java.util.Map<java.lang.String,java.lang.String> dataMap)`	Decodes a given set of bytes into field values.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - NAME
```
public static final java.lang.String NAME
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DummyRowDecoder
```
public DummyRowDecoder()
```
- Method Detail
  - decodeRow
```
public java.util.Optional<java.util.Map<DecoderColumnHandle,FieldValueProvider>> decodeRow(byte[] data,
                                                                                                 java.util.Map<java.lang.String,java.lang.String> dataMap)
```
    Description copied from interface: RowDecoder
    
    Decodes a given set of bytes into field values.
    
    Specified by:
    
    decodeRow in interface RowDecoder
    
    Parameters:
    
    data - The row data to decode.
    
    dataMap - The row data as fields map
    
    Returns:
    
    Returns mapping from column handle to decoded value. Unmapped columns will be reported as null. Optional.empty() signals decoding error.