org.apache.hadoop.hive.serde2
Class ColumnProjectionUtils

java.lang.Object
  org.apache.hadoop.hive.serde2.ColumnProjectionUtils

public final class ColumnProjectionUtils
extends Object

ColumnProjectionUtils.

Field Summary

static String	READ_ALL_COLUMNS
static String	READ_COLUMN_IDS_CONF_STR
static String	READ_COLUMN_NAMES_CONF_STR

Method Summary

static void	appendReadColumnIDs(org.apache.hadoop.conf.Configuration conf, List<Integer> ids) Deprecated. for backwards compatibility with <= 0.12, use appendReadColumns
static void	appendReadColumns(org.apache.hadoop.conf.Configuration conf, List<Integer> ids) Appends read columns' ids (start from zero).
static void	appendReadColumns(org.apache.hadoop.conf.Configuration conf, List<Integer> ids, List<String> names)
static List<Integer>	getReadColumnIDs(org.apache.hadoop.conf.Configuration conf) Returns an array of column ids(start from zero) which is set in the given parameter conf.
static boolean	isReadAllColumns(org.apache.hadoop.conf.Configuration conf) Returns the READ_ALL_COLUMNS columns flag.
static void	setFullyReadColumns(org.apache.hadoop.conf.Configuration conf) Deprecated. for backwards compatibility with <= 0.12, use setReadAllColumns
static void	setReadAllColumns(org.apache.hadoop.conf.Configuration conf) Sets the READ_ALL_COLUMNS flag and removes any previously set column ids.
static void	setReadColumnIDs(org.apache.hadoop.conf.Configuration conf, List<Integer> ids) Deprecated. for backwards compatibility with <= 0.12, use setReadAllColumns and appendReadColumns

Methods inherited from class java.lang.Object

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

Field Detail

READ_COLUMN_IDS_CONF_STR

public static final String READ_COLUMN_IDS_CONF_STR

See Also:

Constant Field Values

READ_ALL_COLUMNS

public static final String READ_ALL_COLUMNS

See Also:

Constant Field Values

READ_COLUMN_NAMES_CONF_STR

public static final String READ_COLUMN_NAMES_CONF_STR

See Also:

Constant Field Values

Method Detail

setFullyReadColumns

@Deprecated
public static void setFullyReadColumns(org.apache.hadoop.conf.Configuration conf)

Deprecated. for backwards compatibility with <= 0.12, use setReadAllColumns

setReadColumnIDs

@Deprecated
public static void setReadColumnIDs(org.apache.hadoop.conf.Configuration conf,
                                               List<Integer> ids)

Deprecated. for backwards compatibility with <= 0.12, use setReadAllColumns and appendReadColumns

appendReadColumnIDs

@Deprecated
public static void appendReadColumnIDs(org.apache.hadoop.conf.Configuration conf,
                                                  List<Integer> ids)

Deprecated. for backwards compatibility with <= 0.12, use appendReadColumns

setReadAllColumns

public static void setReadAllColumns(org.apache.hadoop.conf.Configuration conf)

Sets the READ_ALL_COLUMNS flag and removes any previously set column ids.

isReadAllColumns

public static boolean isReadAllColumns(org.apache.hadoop.conf.Configuration conf)

Returns the READ_ALL_COLUMNS columns flag.

appendReadColumns

public static void appendReadColumns(org.apache.hadoop.conf.Configuration conf,
                                     List<Integer> ids)

Appends read columns' ids (start from zero). Once a column is included in the list, a underlying record reader of a columnar file format (e.g. RCFile and ORC) can know what columns are needed.

appendReadColumns

public static void appendReadColumns(org.apache.hadoop.conf.Configuration conf,
                                     List<Integer> ids,
                                     List<String> names)

getReadColumnIDs

public static List<Integer> getReadColumnIDs(org.apache.hadoop.conf.Configuration conf)

Returns an array of column ids(start from zero) which is set in the given parameter conf.