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Showing content from https://spark.apache.org/docs/latest/api/java/org/apache/spark/sql/types/MapType.html below:

MapType (Spark 4.0.0 JavaDoc)

All Implemented Interfaces:

Serializable, scala.Equals, scala.Product

The data type for Maps. Keys in a map are not allowed to have

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

  Constructors

  No-arg constructor for kryo.

• Method Summary

  Construct a

  MapType

  object with the given key type and value type.

  String representation for the type saved in external catalogs.

  int

  The default size of a value of the MapType is (the default size of the key type + the default size of the value type).

  Readable string representation for the type.

  Returns the same data type but set all nullability fields are true (StructField.nullable, ArrayType.containsNull, and MapType.valueContainsNull).

  boolean

  Methods inherited from class org.apache.spark.sql.types.DataTypeCOLLATIONS_METADATA_KEY, equalsIgnoreCaseAndNullability, equalsIgnoreNullability, equalsStructurally, equalsStructurallyByName, fromDDL, fromJson, json, parseTypeWithFallback, prettyJson, typeName
  Methods inherited from interface scala.EqualscanEqual, equals
  Methods inherited from interface scala.ProductproductArity, productElement, productElementName, productElementNames, productIterator, productPrefix

• Constructor Details
  • MapType
  • MapType

    public MapType()

    No-arg constructor for kryo.

• Method Details
  • apply

    Construct a

    MapType

    object with the given key type and value type. The

    valueContainsNull

    is true.

    Parameters:

    keyType - (undocumented)

    valueType - (undocumented)

    Returns:

    (undocumented)

  • keyType
  • valueType
  • valueContainsNull

    public boolean valueContainsNull()

  • defaultSize

    public int defaultSize()

    The default size of a value of the MapType is (the default size of the key type + the default size of the value type). We assume that there is only 1 element on average in a map. See SPARK-18853.

    Specified by:

    defaultSize in class DataType

    Returns:

    (undocumented)

  • simpleString

    Readable string representation for the type.

    Overrides:

    simpleString in class DataType

  • catalogString public String catalogString

    ()

    String representation for the type saved in external catalogs.

    Overrides:

    catalogString in class DataType

  • sql

    Overrides:

    sql in class DataType

  • toNullable

    Returns the same data type but set all nullability fields are true (

    StructField.nullable

    ,

    ArrayType.containsNull

    , and

    MapType.valueContainsNull

    ).

    Returns:

    (undocumented)

    Since:

    4.0.0

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