org.apache.hadoop.hive.metastore

Class PartitionProjectionEvaluator

java.lang.Object

org.apache.hadoop.hive.metastore.PartitionProjectionEvaluator

public class PartitionProjectionEvaluator
extends Object

Evaluator for partition projection filters which specify parts of the partition that should be used using dot notation for fields.

Constructor Summary

Constructors

Constructor and Description
PartitionProjectionEvaluator(javax.jdo.PersistenceManager pm, com.google.common.collect.ImmutableMap<String,String> fieldNameToTableName, List<String> projectionFields, boolean convertMapNullsToEmptyStrings, boolean isView, String includeParamKeyPattern, String excludeParamKeyPattern)

Method Summary

Modifier and Type	Method and Description
static List<String>	getMPartitionFieldNames(List<String> partitionFields) Given a list of partition fields, checks if all the fields requested are single-valued.
List<Partition>	getPartitionsUsingProjectionList(List<Long> partitionIds) Given a list of partition ids, returns the List of partially filled partitions based on the projection list used to instantiate this PartitionProjectionEvaluator

Methods inherited from class java.lang.Object

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

Constructor Detail

PartitionProjectionEvaluator

public PartitionProjectionEvaluator(javax.jdo.PersistenceManager pm,
                                    com.google.common.collect.ImmutableMap<String,String> fieldNameToTableName,
                                    List<String> projectionFields,
                                    boolean convertMapNullsToEmptyStrings,
                                    boolean isView,
                                    String includeParamKeyPattern,
                                    String excludeParamKeyPattern)
                             throws MetaException

Throws:

MetaException

Method Detail

getPartitionsUsingProjectionList

public List<Partition> getPartitionsUsingProjectionList(List<Long> partitionIds)
                                                 throws MetaException

Given a list of partition ids, returns the List of partially filled partitions based on the projection list used to instantiate this PartitionProjectionEvaluator

Parameters:

partitionIds - List of partition ids corresponding to the Partitions objects which are requested

Returns:

Partitions where each partition has only the projected fields set

Throws:

MetaException

getMPartitionFieldNames

public static List<String> getMPartitionFieldNames(List<String> partitionFields)
                                            throws MetaException

Given a list of partition fields, checks if all the fields requested are single-valued. If all the fields are single-valued returns list of equivalent MPartition fieldnames which can be used in the setResult clause of a JDO query

Parameters:

partitionFields - List of partitionFields in the projection

Returns:

List of JDO field names which can be used in setResult clause of a JDO query. Returns null if input partitionFields cannot be used in a setResult clause

Throws:

MetaException