org.apache.parquet.hadoop.metadata

Interface KeyValueMetadataMergeStrategy

All Superinterfaces:

Serializable

All Known Implementing Classes:

ConcatenatingKeyValueMetadataMergeStrategy, StrictKeyValueMetadataMergeStrategy

public interface KeyValueMetadataMergeStrategy
extends Serializable

Strategy to merge metadata. Possible implementations: 1) Expect metadata to be exactly identical. Otherwise throw error (this is the default strategy implementation) 2) Custom strategy to merge metadata if the values are not identical. Example: concatenate values.

Method Summary

Modifier and Type	Method and Description
Map<String,String>	merge(Map<String,Set<String>> keyValueMetaData)

Method Detail

merge

Map<String,String> merge(Map<String,Set<String>> keyValueMetaData)

Parameters:

keyValueMetaData - the merged app specific metadata