org.apache.spark.sql.types
Class MapType

Object
  org.apache.spark.sql.types.DataType
      org.apache.spark.sql.types.MapType

All Implemented Interfaces:

java.io.Serializable, scala.Equals, scala.Product

public class MapType
extends DataType
implements scala.Product, scala.Serializable

:: DeveloperApi :: The data type for Maps. Keys in a map are not allowed to have null values.

Please use DataTypes.createMapType() to create a specific instance.

param: keyType The data type of map keys. param: valueType The data type of map values. param: valueContainsNull Indicates if map values have null values.

See Also:

Serialized Form

Constructor Summary

MapType()
No-arg constructor for kryo.

MapType(DataType keyType, DataType valueType, boolean valueContainsNull)

Method Summary

static MapType	apply(DataType keyType, DataType valueType) Construct a MapType object with the given key type and value type.
int	defaultSize() The default size of a value of the MapType is 100 * (the default size of the key type + the default size of the value type).
DataType	keyType()
String	simpleString() Readable string representation for the type.
boolean	valueContainsNull()
DataType	valueType()

Methods inherited from class org.apache.spark.sql.types.DataType

fromCaseClassString, fromJson, json, prettyJson, typeName

Methods inherited from class Object

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

Methods inherited from interface scala.Product

productArity, productElement, productIterator, productPrefix

Methods inherited from interface scala.Equals

canEqual, equals

Constructor Detail

MapType

public MapType(DataType keyType,
               DataType valueType,
               boolean valueContainsNull)

MapType

public MapType()

No-arg constructor for kryo.

Method Detail

apply

public static MapType apply(DataType keyType,
                            DataType valueType)

Construct a MapType object with the given key type and value type. The valueContainsNull is true.

Parameters:

keyType - (undocumented)

valueType - (undocumented)

Returns:

(undocumented)

keyType

public DataType keyType()

valueType

public DataType valueType()

valueContainsNull

public boolean valueContainsNull()

defaultSize

public int defaultSize()

The default size of a value of the MapType is 100 * (the default size of the key type + the default size of the value type). (We assume that there are 100 elements).

Specified by:

defaultSize in class DataType

Returns:

(undocumented)

simpleString

public String simpleString()

Description copied from class: DataType

Readable string representation for the type.

Overrides:

simpleString in class DataType