ConcatenatingKeyValueMetadataMergeStrategy (Apache Parquet Hadoop 1.12.0 API)

java.lang.Object
- org.apache.parquet.hadoop.metadata.ConcatenatingKeyValueMetadataMergeStrategy

All Implemented Interfaces:

Serializable, KeyValueMetadataMergeStrategy
```
public class ConcatenatingKeyValueMetadataMergeStrategy
extends Object
implements KeyValueMetadataMergeStrategy
```
Strategy to concatenate if there are multiple values for a given key in metadata. Note: use this with caution. This is expected to work only for certain use cases.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`ConcatenatingKeyValueMetadataMergeStrategy()`	Default constructor.
`ConcatenatingKeyValueMetadataMergeStrategy(String delim)`	Constructor to use different delimiter for concatenation.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

Map<String,String> merge(Map<String,Set<String>> keyValueMetaData)
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ConcatenatingKeyValueMetadataMergeStrategy
```
public ConcatenatingKeyValueMetadataMergeStrategy()
```
    Default constructor.
  - ConcatenatingKeyValueMetadataMergeStrategy
```
public ConcatenatingKeyValueMetadataMergeStrategy(String delim)
```
    Constructor to use different delimiter for concatenation.
    
    Parameters:
    
    delim - delimiter char sequence.
- Method Detail
  - merge
```
public Map<String,String> merge(Map<String,Set<String>> keyValueMetaData)
```
    Specified by:
    
    merge in interface KeyValueMetadataMergeStrategy
    
    Parameters:
    
    keyValueMetaData - the merged app specific metadata