org.apache.parquet.hadoop.metadata

Class ConcatenatingKeyValueMetadataMergeStrategy

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

Method Summary

Modifier and Type	Method and 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