io.prestosql.plugin.hive

Class HivePageSourceProvider.ColumnMapping

java.lang.Object

io.prestosql.plugin.hive.HivePageSourceProvider.ColumnMapping

Enclosing class:

HivePageSourceProvider

public static class HivePageSourceProvider.ColumnMapping
extends Object

Method Summary

Modifier and Type	Method and Description
static List<HivePageSourceProvider.ColumnMapping>	buildColumnMappings(List<HivePartitionKey> partitionKeys, List<HiveColumnHandle> columns, List<HiveColumnHandle> requiredInterimColumns, Map<Integer,HiveType> columnCoercions, org.apache.hadoop.fs.Path path, OptionalInt bucketNumber)
static List<HivePageSourceProvider.ColumnMapping>	extractRegularAndInterimColumnMappings(List<HivePageSourceProvider.ColumnMapping> columnMappings)
Optional<HiveType>	getCoercionFrom()
HiveColumnHandle	getHiveColumnHandle()
int	getIndex()
HivePageSourceProvider.ColumnMappingKind	getKind()
String	getPrefilledValue()
static HivePageSourceProvider.ColumnMapping	interim(HiveColumnHandle hiveColumnHandle, int index)
static HivePageSourceProvider.ColumnMapping	prefilled(HiveColumnHandle hiveColumnHandle, String prefilledValue, Optional<HiveType> coerceFrom)
static HivePageSourceProvider.ColumnMapping	regular(HiveColumnHandle hiveColumnHandle, int index, Optional<HiveType> coerceFrom)
static List<HiveColumnHandle>	toColumnHandles(List<HivePageSourceProvider.ColumnMapping> regularColumnMappings, boolean doCoercion)

Methods inherited from class java.lang.Object

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

Method Detail

regular

public static HivePageSourceProvider.ColumnMapping regular(HiveColumnHandle hiveColumnHandle,
                                                           int index,
                                                           Optional<HiveType> coerceFrom)

prefilled

public static HivePageSourceProvider.ColumnMapping prefilled(HiveColumnHandle hiveColumnHandle,
                                                             String prefilledValue,
                                                             Optional<HiveType> coerceFrom)

interim

public static HivePageSourceProvider.ColumnMapping interim(HiveColumnHandle hiveColumnHandle,
                                                           int index)

getKind

public HivePageSourceProvider.ColumnMappingKind getKind()

getPrefilledValue

public String getPrefilledValue()

getHiveColumnHandle

public HiveColumnHandle getHiveColumnHandle()

getIndex

public int getIndex()

getCoercionFrom

public Optional<HiveType> getCoercionFrom()

buildColumnMappings

public static List<HivePageSourceProvider.ColumnMapping> buildColumnMappings(List<HivePartitionKey> partitionKeys,
                                                                             List<HiveColumnHandle> columns,
                                                                             List<HiveColumnHandle> requiredInterimColumns,
                                                                             Map<Integer,HiveType> columnCoercions,
                                                                             org.apache.hadoop.fs.Path path,
                                                                             OptionalInt bucketNumber)

Parameters:

columns - columns that need to be returned to engine

requiredInterimColumns - columns that are needed for processing, but shouldn't be returned to engine (may overlaps with columns)

columnCoercions - map from hive column index to hive type

bucketNumber - empty if table is not bucketed, a number within [0, # bucket in table) otherwise

extractRegularAndInterimColumnMappings

public static List<HivePageSourceProvider.ColumnMapping> extractRegularAndInterimColumnMappings(List<HivePageSourceProvider.ColumnMapping> columnMappings)

toColumnHandles

public static List<HiveColumnHandle> toColumnHandles(List<HivePageSourceProvider.ColumnMapping> regularColumnMappings,
                                                     boolean doCoercion)